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The Cochrane Database of Systematic Reviews logoLink to The Cochrane Database of Systematic Reviews
. 2022 Dec 6;2022(12):CD013799. doi: 10.1002/14651858.CD013799.pub2

Effectiveness and tolerability of dual and triple combination inhaler therapies compared with each other and varying doses of inhaled corticosteroids in adolescents and adults with asthma: a systematic review and network meta‐analysis

Yuji Oba 1,, Sumayya Anwer 2, Tinashe Maduke 1, Tarang Patel 1, Sofia Dias 2
Editor: Cochrane Airways Group
PMCID: PMC9723963  PMID: 36472162

Abstract

Background

Current guidelines recommend a higher‐dose inhaled corticosteroids (ICS) or adding a long‐acting muscarinic antagonist (LAMA) when asthma is not controlled with medium‐dose (MD) ICS/long‐acting beta2‐agonist (LABA) combination therapy.

Objectives

To assess the effectiveness and safety of dual (ICS/LABA) and triple therapies (ICS/LABA/LAMA) compared with each other and with varying doses of ICS in adolescents and adults with uncontrolled asthma.

Search methods

We searched multiple databases for pre‐registered randomised controlled trials (RCTs) of at least 12 weeks of study duration from 2008 to 18 February 2022.

Selection criteria

We searched studies, including adolescents and adults with uncontrolled asthma who had been treated with, or were eligible for, MD‐ICS/LABA, comparing dual and triple therapies. We excluded cluster‐ and cross‐over RCTs.

Data collection and analysis

We conducted a systematic review and network meta‐analysis according to the previously published protocol. We used Cochrane’s Screen4ME workflow to assess search results and Grading of Recommendations Assessment, Development and Evaluation (GRADE) to assess the certainty of evidence. The primary outcome was steroid‐requiring asthma exacerbations and asthma‐related hospitalisations (moderate to severe and severe exacerbations).

Main results

We included 17,161 patients with uncontrolled asthma from 17 studies (median duration 26 weeks; mean age 49.1 years; male 40%; white 81%; mean forced expiratory volume in 1 second (MEF 1)1.9 litres and 61% predicted). The quality of included studies was generally good except for some outcomes in a few studies due to high attrition rates.

Medium‐dose (MD) and high‐dose (HD) triple therapies reduce steroid‐requiring asthma exacerbations (hazard ratio (HR) 0.84 [95% credible interval (CrI) 0.71 to 0.99] and 0.69 [0.58 to 0.82], respectively) (high‐certainty evidence), but not asthma‐related hospitalisations, compared to MD‐ICS/LABA.

High‐dose triple therapy likely reduces steroid‐requiring asthma exacerbations compared to MD triple therapy (HR 0.83 [95% CrI 0.69 to 0.996], [moderate certainty]). Subgroup analyses suggest the reduction in steroid‐requiring exacerbations associated with triple therapies may be only for those with a history of asthma exacerbations in the previous year but not for those without.

High‐dose triple therapy, but not MD triple, results in a reduction in all‐cause adverse events (AEs) and likely reduces dropouts due to AEs compared to MD‐ICS/LABA (odds ratio (OR) 0.79 [95% CrI 0.69 to 0.90], [high certainty] and 0.50 [95% CrI 0.30 to 0.84], [moderate certainty], respectively). Triple therapy results in little to no difference in all‐cause or asthma‐related serious adverse events (SAEs) compared to dual therapy (high certainty).

The evidence suggests triple therapy results in little or no clinically important difference in symptoms or quality of life compared to dual therapy considering the minimal clinically important differences (MCIDs) and HD‐ICS/LABA is unlikely to result in any significant benefit or harm compared to MD‐ICS/LABA.

Authors' conclusions

Medium‐dose and HD triple therapies reduce steroid‐requiring asthma exacerbations, but not asthma‐related hospitalisations, compared to MD‐ICS/LABA especially in those with a history of asthma exacerbations in the previous year. High‐dose triple therapy is likely superior to MD triple therapy in reducing steroid‐requiring asthma exacerbations.

Triple therapy is unlikely to result in clinically meaningful improvement in symptoms or quality of life compared to dual therapy considering the MCIDs.

High‐dose triple therapy, but not MD triple, results in a reduction in all‐cause AEs and likely reduces dropouts due to AEs compared to MD‐ICS/LABA. Triple therapy results in little to no difference in all‐cause or asthma‐related SAEs compared to dual therapy.

HD‐ICS/LABA is unlikely to result in any significant benefit or harm compared to MD‐ICS/LABA, although long‐term safety of higher rather than MD‐

ICS remains to be demonstrated given the median duration of included studies was six months.

The above findings may assist deciding on a treatment option when asthma is not controlled with MD‐ICS/LABA.

Plain language summary

What is triple inhaled therapy, when is it used, and what does it do in asthma?

How are inhalers used for the management of asthma?

Management of asthma involves a series of stepwise therapies depending on the severity of the disease. Initial therapy typically starts with as needed short‐acting inhaler therapy (step 1), and a daily low‐ to medium‐dose inhaled steroids is added for better asthma control when needed (step 2). Subsequently, a bronchodilator known as long‐acting beta2‐agonist (LABA), which causes the passages of the airways to expand and relax so that breathing difficulty is reduced, is typically added to inhaled steroids if needed (steps 3 and 4).

What are the options when asthma is not controlled with a combination of inhaled steroids and LABA?

Current guidelines recommend a higher‐dose of inhaled steroids or adding another bronchodilator known as long‐acting muscarinic antagonist (LAMA), (i.e. triple inhaled therapy) (step 5), when asthma is not controlled with medium‐dose inhaled steroids and LABA dual inhaled therapy.

How did we answer the question?

We collected and analysed data from 17 studies, including a total of 17,161 adolescents and adults with uncontrolled asthma, using a special method called a network meta‐analysis, which enabled us to simultaneously compare multiple inhaler groups.

What did we find?

Triple inhaled therapy (i.e, inhaled steroids + LABA + LAMA) reduces asthma flare‐ups, but not asthma‐related hospitalisations. High‐dose triple therapy, not medium‐dose triple, is likely to be better tolerated due to less side effects compared to dual inhaled therapy (i.e. inhaled steroids + LABA).

Triple therapy may improve symptom and quality of life scores compared to dual therapy but not enough to be perceived by those being on it.

Higher than medium‐dose inhaled steroids in dual inhaled therapy are unlikely to result in any additional benefit or harm.

Conclusions

Triple inhaled therapy, especially high‐dose formulations, reduces asthma flare‐ups and is likely to be better tolerated due to less side effects compared to dual therapy.

Triple inhaled therapy may or may not to improve symptoms or quality of life compared to dual therapy.

Increasing the strength of inhaled steroids from medium to high dose is likely beneficial in triple inhaled therapy but probably not in dual therapy.

Immuno modulators, which are injectable medications, or other options may be considered if asthma symptoms are not well controlled or for those requiring asthma‐related hospitalisations despite being on medium‐dose dual inhaled therapy.

Summary of findings

Summary of findings 1. NMA Summary of Findings for severe exacerbations (asthma‐related hospitalisations).

Patient or population: Adolescents and adults with symptomatic asthma
Interventions: HD‐ICS/LABA, MD‐TRIPLE, HD‐TRIPLE
Comparator (reference): Medium‐Dose ICS/LABA (MD‐ICS/LABA)
Outcome: Severe exacerbations
Setting(s): Outpatient
Geometry of the Network in Figure 1*
Total studies: 8 RCTs
Total Participants: 9983
Hazard ratio**
(95% CrI)
Anticipated absolute effect at the end of 1 year***(95% CrI) Certainty of the evidence Ranking****
(95% CrI)
Interpretation of Findings
With intervention
(With MD‐ICS/LABA)
Difference
HD‐ICS/LABA
(Direct evidence; 7 RCTs; 7023 participants)
1.43
(0.76 to 2.77)
15 per 1000 5 per 1000 more
(from 2 fewer to 18 more)
⊕⊕⊕◯
Moderate
Due to substantial heterogeneity1
3.0
(1.0 to 4.0)
Probably little or no difference
MD‐TRIPLE
(Direct evidence; 2 RCTs; 1023 participants)
1.73
(0.90 to 3.32)
18 per 1000 8 per 1000 more
(from 1 fewer to 24 more)
⊕⊕◯◯
Low
Due to imprecision2
4.0
(1.0 to 4.0)
Suggest little or no difference
HD‐TRIPLE
(Direct evidence; 2 RCTs; 1024 participants)
1.14
(0.54 to 2.41)
12 per 1000 2 per 1000 more
(from 4 fewer to 15 more)
⊕⊕◯◯
Low
Due to imprecision2
2.0
(1.0 to 4.0)
Suggest little or no difference
MD‐ICS/LABA Reference Comparator (10 per 1000)3 Reference Comparator Reference Comparator 1.0
(1.0 to 3.0)
Reference Comparator
NMA‐SoF table definitions
* The size of the nodes and the thickness of edges depend on the number of people randomised and the number of trials conducted.
** Network Meta‐Analysis estimates are reported as hazard ratio. Results are expressed in credible intervals as opposed to the confidence intervals since a Bayesian analysis has been conducted.
*** Anticipated absolute effect (exacerbation rate at 1 year). Anticipated absolute effect compares two rates by calculating the difference between the rates of the intervention group with the rate of MD‐ICS/LABA group.
**** Median and credible intervals are presented. Rank statistics is defined as the probabilities that a treatment out of n treatments in a network meta‐analysis is the best, the second, the third and so on until the least effective treatment.
GRADE Working Group grades of evidence (or certainty in the evidence)
High quality: We are very confident that the true effect lies close to that of the estimate of the effect
Moderate quality: We are moderately confident in the effect estimate: The true effect is likely to be close to the estimate of the effect, but there is a possibility that it is substantially different
Low quality: Our confidence in the effect estimate is limited: The true effect may be substantially different from the estimate of the effect
Very low quality: We have very little confidence in the effect estimate: The true effect is likely to be substantially different from the estimate of effect
Explanatory Footnotes
1 Substantial heterogeneity I2>= 50% to 90% in the direct pairwise comparison.
2 Very serious imprecision. Due to wide confidence intervals and suboptimal sample sizes in the direct and/or indirect estimate(s).
3 Based on the average rate in patients treated with MD‐ICS/LABA in the included studies.

CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta2 agonist; MD: medium dose; NMA: network meta‐analysis; RCT: randomised controlled trial.

1.

1

Network diagram for severe exacerbations for grouped interventions.

The size of the nodes and the thickness of edges depend on the number of people randomised and the number of trials conducted. HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

Summary of findings 2. Asthma exacerbations ‐ pairwise comparisons.

Outcome№ of participants(studies) Relative effect(95% CI) Anticipated absolute effects (95% CI) Certainty of the evidence What happens
With active control With experimental comparator Difference
Severe exacerbations ‐ HD‐ICA/LABA vs MD‐ICS LABA
№ of participants: 4492
(5 RCTs)
Follow up: 3 to 12 months
RR 1.49
(0.74 to 3.01) 0.8% 1.1%
(0.6 to 2.3) 0.4% more
(0.2 fewer to 1.5 more) ⨁⨁⨁◯
Moderatea HD‐ICA/LABA likely results in little to no difference in severe exacerbations compared to MD‐ICS LABA.
Severe exacerbations ‐ MD TRIPLE vs MD‐ICS/LABA
№ of participants: 813
(1 RCT)
Follow up: 12 months
RR 1.00
(0.35 to 2.83) 1.7% 1.7%
(0.6 to 4.9) 0.0% fewer
(1.1 fewer to 3.1 more) ⨁⨁◯◯
Lowb, c The evidence suggests that MD TRIPLE results in little to no difference in severe exacerbations compared to MD‐ICS/LABA.
Severe exacerbations ‐ HD TRIPLE vs MD‐ICS/LABA
№ of participants: 815
(1 RCT)
Follow up: 12 months
RR 0.57
(0.17 to 1.93) 1.7% 1.0%
(0.3 to 3.3) 0.7% fewer
(1.4 fewer to 1.6 more) ⨁⨁◯◯
Lowb, c The evidence suggests that HD TRIPLE results in little to no difference in severe exacerbations compared to MD‐ICS/LABA.
Severe exacerbations ‐ MD TRIPLE vs HD‐ICS/LABA
№ of participants: 812
(1 RCT)
Follow up: 12 months
RR 1.40
(0.45 to 4.37) 1.2% 1.7%
(0.6 to 5.4) 0.5% more
(0.7 fewer to 4.2 more) ⨁⨁◯◯
Lowb, c The evidence suggests that MD TRIPLE results in little to no difference in severe exacerbations compared to HD‐ICS/LABA.
Severe exacerbations ‐ HD TRIPLE vs HD‐ICS/LABA
№ of participants: 1727
(2 RCTs)
Follow up: 12 months
RR 0.80
(0.45 to 1.42) 2.9% 2.3%
(1.3 to 4.1) 0.6% fewer
(1.6 fewer to 1.2 more) ⨁⨁⨁◯
Moderateb HD TRIPLE likely results in little to no difference in severe exacerbations compared to HD‐ICS LABA.
Severe exacerbations ‐ HD TRIPLE vs MD TRIPLE
№ of participants: 814
(1 RCT)
Follow up: 12 months
RR 0.57
(0.17 to 1.93) 1.7% 1.0%
(0.3 to 3.3) 0.7% fewer
(1.4 fewer to 1.6 more) ⨁⨁◯◯
Lowb, c The evidence suggests that HD TRIPLE results in little to no difference in severe exacerbations compared to MD TRIPLE.
Severe exacerbations ‐ TRIPLE vs DUAL
№ of participants: 2540
(2 RCTs)
Follow up: 12 months
RR 0.84
(0.51 to 1.40) 2.5% 2.1%
(1.3 to 3.5) 0.4% fewer
(1.2 fewer to 1 more) ⨁⨁⨁◯
Moderated TRIPLE likely results in little to no difference in severe exacerbations compared to DUAL.
Moderate to severe exacerbations ‐ HD‐ICS/LABA vs MD‐ICS/LABA
№ of participants: 5452
(6 RCTs)
Follow up: 3 to 12 months
RR 0.93
(0.82 to 1.05) 15.0% 14.0%
(12.3 to 15.8) 1.1% fewer
(2.7 fewer to 0.8 more) ⨁⨁⨁⨁
High HD‐ICS/LABA results in little to no difference in moderate to severe exacerbations compared to MD‐ICS/LABA.
Moderate to severe exacerbations ‐ MD TRIPLE vs MD‐ICS/LABA
№ of participants: 3184
(3 RCTs)
Follow up: 12 months
RR 0.86
(0.75 to 0.99) 22.8% 19.6%
(17.1 to 22.6) 3.2% fewer
(5.7 fewer to 0.2 fewer) ⨁⨁⨁◯
Moderateb MD TRIPLE likely reduces moderate to severe exacerbations compared to MD‐ICS/LABA.
Moderate to severe exacerbations ‐ HD TRIPLE vs MD‐ICS/LABA
№ of participants: 2037
(2 RCTs)
Follow up: 12 months
RR 0.78
(0.66 to 0.92) 24.0% 18.7%
(15.8 to 22) 5.3% fewer
(8.1 fewer to 1.9 fewer) ⨁⨁⨁⨁
High HD TRIPLE reduces moderate to severe exacerbations compared to MD‐ICS/LABA.
Moderate to severe exacerbations ‐ MD TRIPLE vs HD‐ICS/LABA
№ of participants: 2651
(2 RCTs)
Follow up: 12 months
RR 1.05
(0.78 to 1.41) 23.4% 24.6%
(18.2 to 33) 1.2% more
(5.1 fewer to 9.6 more) ⨁⨁◯◯
Lowa, d MD TRIPLE may result in little to no difference in moderate to severe exacerbations compared to HD‐ICS/LABA.
Moderate to severe exacerbations ‐ HD TRIPLE vs HD‐ICS/LABA
№ of participants: 4989
(4 RCTs)
Follow up: 12 months
RR 0.83
(0.75 to 0.92) 25.2% 20.9%
(18.9 to 23.2) 4.3% fewer
(6.3 fewer to 2 fewer) ⨁⨁⨁⨁
High HD TRIPLE reduces moderate to severe exacerbations compared to HD‐ICS/LABA.
Moderate to severe exacerbations ‐ HD TRIPLE vs MD TRIPLE
№ of participants: 3470
(3 RCTs)
Follow up: 6 to 12 months
RR 0.85
(0.72 to 1.01) 15.2% 12.9%
(10.9 to 15.3) 2.3% fewer
(4.2 fewer to 0.2 more) ⨁⨁⨁◯
Moderatee HD TRIPLE likely results in a slight reduction in moderate to severe exacerbations compared to MD TRIPLE.
Moderate to severe exacerbations ‐ TRIPLE vs DUAL
№ of participants: 8173
(5 RCTs)
Follow up: 12 months
RR 0.85
(0.78 to 0.92) 24.3% 20.6%
(18.9 to 22.3) 3.6% fewer
(5.3 fewer to 1.9 fewer) ⨁⨁⨁⨁
High TRIPLE reduces moderate to severe exacerbations compared to DUAL.
*The risk in the intervention group (and its 95% confidence interval) is based on the assumed risk in the comparison group and the relative effect of the intervention (and its 95% CI).
GRADE Working Group grades of evidenceHigh certainty: we are very confident that the true effect lies close to that of the estimate of the effect.
Moderate certainty: we are moderately confident in the effect estimate: the true effect is likely to be close to the estimate of the effect, but there is a possibility that it is substantially different.
Low certainty: our confidence in the effect estimate is limited: the true effect may be substantially different from the estimate of the effect.
Very low certainty: we have very little confidence in the effect estimate: the true effect is likely to be substantially different from the estimate of effect.
Explanations
a. Substantial heterogeneity I2 > 50% to 90%
b. Optimal information size is not met (Guyatt 2011b)
c. Total size of less than 1000 participants may suggest small study effect (Dechartres 2013)
d. Confidence interval includes a clinically important difference.
e. Confidence interval includes the null effect.

CI: confidence interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta2 agonist; MD: medium dose; RCT: randomised controlled trial; RR: risk ratio.

Summary of findings 3. NMA Summary of Findings for moderate to severe (steroid‐requiring) exacerbations.

Patient or population: Adolescents and adults with symptomatic asthma
Interventions: HD‐ICS/LABA, MD‐TRIPLE, HD‐TRIPLE
Comparator (reference): Medium‐Dose ICS/LABA (MD‐ICS/LABA)
Outcome: Moderate to severe exacerbations
Setting(s): Outpatient
Geometry of the Network in Figure 2*
Total studies: 10 RCTs
Total Participants: 12407
Hazard ratio**
(95% CrI)
Anticipated absolute effect at the end of 1 year***(95% CrI) Certainty of the evidence Ranking****
(95% CrI)
Interpretation of Findings
With intervention Difference compared to MD‐ICS/LABA
HD‐ICS/LABA
 
(Direct evidence; 6 RCTs; 5452 participants)
0.90
(0.77 to 1.04)
176 per 1000 20 per 1000 fewer
(from 45 fewer to 8 more)
⊕⊕⊕⊕
High
 
3.0
(2.0 to 4.0)
Little or no difference
MD‐TRIPLE
 
(Direct evidence; 3 RCTs; 3184 participants)
0.84
(0.71 to 0.99)
165 per 1000 31 per 1000 fewer
(from 2 fewer to 57 fewer)
⊕⊕⊕◯
Moderate
Due to imprecision1
 
2.0
(2.0 to 3.0)
Probably superior
HD‐TRIPLE
 
(Direct evidence; 2 RCTs; 2037 participants)
0.69
(0.58 to 0.82)
135 per 1000 61 per 1000 fewer
(from 35 fewer to 82 fewer)
⊕⊕⊕⊕
High
1.0
(1.0 to 1.0)
Superior
MD‐ICS/LABA Reference Comparator 196 per 10002 Reference Comparator Reference Comparator 4.0
(3.0 to 4.0)
Reference Comparator
HD Triple vs. MD Triple
HD‐TRIPLE
(Direct evidence; 3 RCTs; 3470 participants)
0.83
(0.69 to 0.996)
162 per 1000 34 per 1000 fewer
(from 1 fewer to 61 fewer)
⊕⊕⊕◯
Moderate
Due to imprecision1
NA Probably superior
MD Triple Reference Comparator 196 per 10003 Reference Comparator Reference Comparator NA Reference Comparator
NMA‐SoF table definitions
* The size of the nodes and the thickness of edges depend on the number of people randomised and the number of trials conducted, respectively.
** Network Meta‐Analysis estimates are reported as hazard ratio. Results are expressed in credible intervals as opposed to the confidence intervals since a Bayesian analysis has been conducted.
*** Anticipated absolute effect (exacerbation rate at 1 year). Anticipated absolute effect compares two rates by calculating the difference between the rates of the intervention group with the rate of MD‐ICS/LABA group.
**** Median and credible intervals are presented. Rank statistics is defined as the probabilities that a treatment out of n treatments in a network meta‐analysis is the best, the second, the third and so on until the least effective treatment.
GRADE Working Group grades of evidence (or certainty in the evidence)
High certainty: We are very confident that the true effect lies close to that of the estimate of the effect
Moderate certainty: We are moderately confident in the effect estimate: The true effect is likely to be close to the estimate of the effect, but there is a possibility that it is substantially different
Low certainty: Our confidence in the effect estimate is limited: The true effect may be substantially different from the estimate of the effect
Very low certainty: We have very little confidence in the effect estimate: The true effect is likely to be substantially different from the estimate of effect
Explanatory Footnotes
1 Serious imprecision. Due to suboptimal sample size(s) in the direct and/or indirect estimate(s).
2 Based on the average rate in participants treated with MD‐ICS/LABA in the included studies.
3 Based on the average rate in participants treated with MD Triple in the included studies.

CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose; NA: not applicable; NMA: network meta‐analysis; RCT: randomised controlled trial.

2.

2

Network diagram for moderate to severe exacerbations for grouped interventions.

The size of the nodes and the thickness of edges depend on the number of people randomised and the number of trials conducted. HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

Summary of findings 4. NMA Summary of Findings for change from baseline in ACQ scores at 3 months.

Patient or population: Adolescents and adults with symptomatic asthma
Interventions: HD‐ICS/LABA, MD‐TRIPLE, HD‐TRIPLE
Comparator (reference): Medium‐Dose ICS/LABA (MD‐ICS/LABA)
Outcome: Change from baseline in ACQ scores at 3 months
Setting(s): Outpatient
Geometry of the Network in Figure 3*
Total studies: 4 RCTs
Total Participants: 4529
Relative effect
(95% CrI)
Anticipated absolute effect**(95% CrI) Certainty of the evidence Ranking***
(95% CrI)
Interpretation of Findings
With intervention Difference compared to MD‐ICS/LABA1
HD‐ICS/LABA
 
(Direct evidence; 3 RCTs; 2450 participants)
0.01
(‐0.05 to 0.07)
0.72
(0.67 to 0.78)
Change from baseline in ACQ score was 0.01 lower (0.07 lower to 0.05 higher) ⨁⨁⨁◯
Moderate
Due to imprecision2
 
4.0
(2.0 to 4.0)
Probably little or no clinically meaningful difference4
MD‐TRIPLE
 
(Direct evidence; 1 RCT; 768 participants)
‐0.06
(‐0.14 to 0.03)
0.78
(0.70 to 0.87)
Change from baseline in ACQ score was 0.06 higher (0.03 lower to 0.14 higher) ⊕⊕◯◯
Low
Due to imprecision3
2.0
(1.0 to 4.0)
Suggest little or no clinically meaningful difference4
HD‐TRIPLE
 
(Direct evidence; 1 RCT; 764 participants)
‐0.09
(‐0.18 to ‐ 0.01)
0.82
(0.74 to 0.90)
Change from baseline in ACQ score was 0.09 higher (0.01 higher to 0.18 higher) ⊕⊕◯◯
Low
Due to imprecision3
1.0
(1.0 to 2.0)
Suggest little or no clinically meaningful difference4
MD‐ICS/LABA Reference Comparator1 0.72 Reference Comparator Reference Comparator 3.0
(2.0 to 4.0)
Reference Comparator
NMA‐SoF table definitions
* The size of the nodes and the thickness of edges depend on the number of people randomised and the number of trials conducted, respectively.
** Estimates are reported as mean difference and credible interval (CrI). Results are expressed in credible intervals as opposed to the confidence intervals since a Bayesian analysis has been conducted.
*** Ranking and confidence intervals for efficacy outcome are presented. Rank statistics is defined as the probabilities that a treatment out of n treatments in a network meta‐analysis is the best, the second, the third and so on until the least effective treatment.
GRADE Working Group grades of evidence (or certainty in the evidence)
High certainty: We are very confident that the true effect lies close to that of the estimate of the effect
Moderate certainty: We are moderately confident in the effect estimate: The true effect is likely to be close to the estimate of the effect, but there is a possibility that it is substantially different
Low certainty: Our confidence in the effect estimate is limited: The true effect may be substantially different from the estimate of the effect
Very low certainty: We have very little confidence in the effect estimate: The true effect is likely to be substantially different from the estimate of effect
Explanatory Footnotes
1 The mean change from baseline in ACQ scores was 0.72with MD‐ICS/LABA.
2 Serious imprecision. Due to small sample sizes in the direct and/or indirect estimate(s).
3 Very serious imprecision. Due to very small sample sizes in the direct and/or indirect estimate(s).
4 Minimal clinically important difference is 0.5.

ACQ: Asthma Control Questionnaire; CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose; NMA: network meta‐analysis; RCT: randomised controlled trial.

3.

3

Network diagram for change from baseline ACQ score at 3 months for grouped interventions.

The size of the nodes and the thickness of edges depend on the number of people randomised and the number of trials conducted. HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

Summary of findings 5. NMA Summary of Findings for change from baseline in ACQ scores at 6 months.

Patient or population: Adolescents and adults with symptomatic asthma
Interventions: HD‐ICS/LABA, MD‐TRIPLE, HD‐TRIPLE
Comparator (reference): Medium‐Dose ICS/LABA (MD‐ICS/LABA)
Outcome: Change from baseline in ACQ scores at 6 months
Setting(s): Outpatient
Geometry of the Network in Figure 4*
Total studies: 6 RCTs
Total Participants: 7957
Relative effect
(95% CrI)
Anticipated absolute effect**(95% CrI) Certainty of the evidence Ranking***
(95% CrI)
Interpretation of Findings
With intervention Difference compared to MD‐ICS/LABA1
HD‐ICS/LABA
 
(Direct evidence; 3 RCTs; 3762 participants)
‐0.03
(‐0.09 to 0.02)
0.90
(0.84 to 0.95)
Change from baseline in ACQ score was 0.03 higher (0.02 lower to 0.09 higher) ⊕⊕⊕◯
Moderate
Due to imprecision2
3.0
(2.0 to 4.0)
Probably little or no clinically meaningful difference3
MD‐TRIPLE
 
(Direct evidence; 2 RCTs; 1961 participants)
‐0.07
(‐0.13 to 0.00)
0.93
(0.86 to 1.00)
Change from baseline in ACQ score was 0.07 higher (0.00 lower to 0.13 higher) ⊕⊕⊕◯
Moderate
Due to imprecision2
2.0
(1.0 to 3.0)
Probably little or no clinically meaningful difference3
HD‐TRIPLE
 
(Direct evidence; 2 RCTs; 1952 participants)
‐0.10
(‐0.16 to ‐0.03)
0.96
(0.90 to 1.02)
Change from baseline in ACQ score was 0.1 higher (0.03 higher to 0.16 higher) ⊕⊕⊕◯
Moderate
Due to imprecision2
1.0
(1.0 to 2.0)
Probably little or no clinically meaningful difference3
MD‐ICS/LABA Reference Comparator1 0.86 Reference Comparator Reference Comparator 4.0
(3.0 to 4.0)
Reference Comparator
NMA‐SoF table definitions
* The size of the nodes and the thickness of edges depend on the number of people randomised and the number of trials conducted, respectively.
** Estimates are reported as mean difference and credible interval (CrI). Results are expressed in credible intervals as opposed to the confidence intervals since a Bayesian analysis has been conducted.
*** Ranking and confidence intervals for efficacy outcome are presented. Rank statistics is defined as the probabilities that a treatment out of n treatments in a network meta‐analysis is the best, the second, the third and so on until the least effective treatment.
GRADE Working Group grades of evidence (or certainty in the evidence)
High certainty: We are very confident that the true effect lies close to that of the estimate of the effect
Moderate certainty: We are moderately confident in the effect estimate: The true effect is likely to be close to the estimate of the effect, but there is a possibility that it is substantially different
Low certainty: Our confidence in the effect estimate is limited: The true effect may be substantially different from the estimate of the effect
Very low certainty: We have very little confidence in the effect estimate: The true effect is likely to be substantially different from the estimate of effect
Explanatory Footnotes
1 The mean change from baseline in ACQ scores was 0.86 with MD‐ICS/LABA.
2 Serious imprecision due to small sample sizes in the direct and/or indirect estimate(s).
3 Minimal clinically important difference is 0.5.

ACQ: Asthma Control Questionnaire; CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta2 agonist; MD: medium dose; NMA: network meta‐analysis; RCT: randomised controlled trial.

4.

4

Network diagram for change from baseline ACQ score at 6 months for grouped interventions.

The size of the nodes and the thickness of edges depend on the number of people randomised and the number of trials conducted. HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

Summary of findings 6. NMA Summary of Findings for change from baseline in ACQ scores at 12 months.

Patient or population: Adolescents and adults with symptomatic asthma
Interventions: HD‐ICS/LABA, MD‐TRIPLE, HD‐TRIPLE
Comparator (reference): Medium‐Dose ICS/LABA (MD‐ICS/LABA)
Outcome: Change from baseline in ACQ scores at 12 months
Setting(s): Outpatient
Geometry of the Network in Figure 5*
Total studies: 5 RCTs
Total Participants: 5440
Relative effect
(95% CrI)
Anticipated absolute effect**(95% CrI) Certainty of the evidence Ranking***
(95% CrI)
Interpretation of Findings
With intervention Difference compared to MD‐ICS/LABA1
HD‐ICS/LABA
 
(Direct evidence; 3 RCTs; 3152 participants)
0.00
(‐0.06 to 0.06)
1.00
(0.94 to 1.06)
Change from baseline in ACQ score was 0.00 (0.06 lower to 0.06 higher) ⊕⊕⊕◯
Moderate
Due to imprecision2
3.0
(2.0 to 4.0)
Probably little or no clinically meaningful difference3
MD‐TRIPLE
 
(Direct evidence; 2 RCTs; 1366 participants)
0.02
(‐0.07 to 0.11)
0.98
(0.89 to 1.07)
Change from baseline in ACQ score was 0.08 higher (0.01 lower to 0.17 higher) ⊕⊕⊕◯
Moderate
Due to imprecision2
4.0
(2.0 to 4.0)
Probably little or no clinically meaningful difference3
HD‐TRIPLE
 
(Direct evidence; 2 RCTs; 1379 participants)
‐0.08
(‐0.16 to 0.00)
1.08
(1.00 to 1.16)
Change from baseline in ACQ score was 0.08 higher (0.00 lower to 0.16 higher) ⊕⊕⊕◯
Moderate
Due to imprecision2
1.0
(1.0 to 2.0)
Probably little or no clinically meaningful difference3
MD‐ICS/LABA Reference Comparator1 1.00 Reference Comparator Reference Comparator 3.0
(2.0 to 4.0)
Reference Comparator
NMA‐SoF table definitions
* The size of the nodes and the thickness of edges depend on the number of people randomised and the number of trials conducted, respectively.
** Estimates are reported as mean difference and credible interval (CrI). Results are expressed in credible intervals as opposed to the confidence intervals since a Bayesian analysis has been conducted.
*** Ranking and confidence intervals for efficacy outcome are presented. Rank statistics is defined as the probabilities that a treatment out of n treatments in a network meta‐analysis is the best, the second, the third and so on until the least effective treatment.
GRADE Working Group grades of evidence (or certainty in the evidence)
High certainty: We are very confident that the true effect lies close to that of the estimate of the effect
Moderate certainty: We are moderately confident in the effect estimate: The true effect is likely to be close to the estimate of the effect, but there is a possibility that it is substantially different
Low certainty: Our confidence in the effect estimate is limited: The true effect may be substantially different from the estimate of the effect
Very low certainty: We have very little confidence in the effect estimate: The true effect is likely to be substantially different from the estimate of effect
Explanatory Footnotes
1 The mean change from baseline in ACQ scores was 1.00with MD‐ICS/LABA.
2 Serious imprecision due to small sample sizes in the direct and/or indirect estimate(s).
3 Minimal clinically important difference is 0.5.

ACQ: Asthma Control Questionnaire; CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta2 agonist; MD: medium dose; NMA: network meta‐analysis; RCT: randomised controlled trial.

5.

5

Network diagram for change from baseline ACQ score at 12 months for grouped interventions.

The size of the nodes and the thickness of edges depend on the number of people randomised and the number of trials conducted. HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

Summary of findings 7. Asthma Control Questionnaire: change from baseline ‐ pairwise comparisons .

Outcome№ of participants(studies) Relative effect(95% CI) Anticipated absolute effects (95% CI)* Certainty of the evidence What happens†
With active control Difference
CFB in ACQ at 3 months ‐ HD‐ICS/LABA vs MD‐ICS/LABA
№ of participants: 2450
(3 RCTs) ‐0.72 MD 0.01 higher
(0.05 lower to 0.07 higher) ⨁⨁⨁◯
Moderatea HD‐ICS/LABA likely results in little to no difference in CFB in ACQ at 3 months compared to MD‐ICS/LABA.
CFB in ACQ at 3 months ‐ MD TRIPLE vs MD‐ICS/LABA
№ of participants: 768
(1 RCT) ‐0.58 MD 0.06 lower
(0.16 lower to 0.04 higher) ⨁⨁◯◯
Lowa, b The evidence suggests that MD TRIPLE results in little to no difference in CFB in ACQ at 3 months compared to MD‐ICS/LABA.
CFB in ACQ at 3 months ‐ HD TRIPLE vs MD‐ICS/LABA
№ of participants: 764
(1 RCT) ‐0.58 MD 0.12 lower
(0.22 lower to 0.02 lower) ⨁⨁◯◯
Lowa, b The evidence suggests that HD TRIPLE results in little to no difference in CFB in ACQ at 3 months compared to MD‐ICS/LABA.
CFB in ACQ at 3 months ‐ MD TRIPLE vs HD‐ICS/LABA
№ of participants: 771
(1 RCT) ‐0.61 MD 0.04 lower
(0.14 lower to 0.06 higher) ⨁⨁◯◯
Lowa, b The evidence suggests that MD TRIPLE results in little to no difference in CFB in ACQ at 3 months compared to HD‐ICS/LABA.
CFB in ACQ at 3 months ‐ HD TRIPLE vs HD‐ICS/LABA
№ of participants: 767
(1 RCT) ‐0.61 MD 0.09 lower
(0.19 lower to 0.01 higher) ⨁⨁◯◯
Lowa, b The evidence suggests that HD TRIPLE results in little to no difference in CFB in ACQ at 3 months compared to HD‐ICS/LABA.
CFB in ACQ at 3 months ‐ HD TRIPLE vs MD TRIPLE
№ of participants: 2079
(2 RCTs) ‐0.85 MD 0.04 lower
(0.11 lower to 0.03 higher) ⨁⨁⨁◯
Moderatea HD TRIPLE likely results in little to no difference in CFB in ACQ at 3 months compared to MD TRIPLE.
CFB in ACQ at 3 months ‐ TRIPLE vs DUAL
№ of participants: 1535
(1 RCT) ‐0.59 MD 0.08 lower
(0.15 lower to 0.01 lower) ⨁⨁⨁◯
Moderatea TRIPLE likely results in little to no difference in CFB in ACQ at 3 months compared to DUAL.
CFB in ACQ at 6 months ‐ HD‐ICS/LABA vs MD‐ICS/LABA
№ of participants: 3762
(3 RCTs) ‐0.86 MD 0.04 lower
(0.12 lower to 0.04 higher) ⨁⨁⨁◯
Moderatec HD‐ICS/LABA likely results in little to no difference in CFB in ACQ at 6 months compared to MD‐ICS/LABA.
CFB in ACQ at 6 months ‐ MD TRIPLE vs MD‐ICS/LABA
№ of participants: 1961
(2 RCTs) ‐0.79 MD 0.09 lower
(0.17 lower to 0.02 lower) ⨁⨁⨁◯
Moderatea MD TRIPLE likely results in little to no difference in CFB in ACQ at 6 months compared to MD‐ICS/LABA.
CFB in ACQ at 6 months ‐ HD TRIPLE vs MD‐ICS/LABA
№ of participants: 1952
(2 RCTs) ‐0.79 MD 0.11 lower
(0.18 lower to 0.04 lower) ⨁⨁⨁◯
Moderatea HD TRIPLE likely results in little to no difference in CFB in ACQ at 6 months compared to MD‐ICS/LABA.
CFB in ACQ at 6 months ‐ MD TRIPLE vs HD‐ICS/LABA
№ of participants: 2561
(2 RCTs) ‐0.91 MD 0.01 lower
(0.08 lower to 0.06 higher) ⨁⨁⨁◯
Moderatea MD TRIPLE likely results in little to no difference in CFB in ACQ at 6 months compared to HD‐ICS/LABA.
CFB in ACQ at 6 months ‐ HD TRIPLE vs HD‐ICS/LABA
№ of participants: 3459
(3 RCTs) ‐0.82 MD 0.06 lower
(0.15 lower to 0.03 higher) ⨁⨁◯◯
Lowa, c The evidence suggests that HD TRIPLE results in little to no difference in CFB in ACQ at 6 months compared to HD‐ICS/LABA.
CFB in ACQ at 6 months ‐ HD TRIPLE vs MD TRIPLE
№ of participants: 3288
(3 RCTs) ‐0.94 MD 0.02 lower
(0.08 lower to 0.04 higher) ⨁⨁⨁◯
Moderatea HD TRIPLE likely results in little to no difference in CFB in ACQ at 6 months compared to MD‐ICS/LABA.
CFB in ACQ at 6 months ‐ TRIPLE vs DUAL
№ of participants: 5408
(4 RCTs) ‐0.81 MD 0.07 lower
(0.14 lower to 0.01 lower) ⨁⨁⨁◯
Moderatea TRIPLE likely results in little to no difference in CFB in ACQ at 6 months compared to DUAL.
CFB in ACQ at 12 months ‐ HD‐ICS/LABA vs MD‐ICS/LABA
№ of participants: 3152
(3 RCTs) ‐1.00 MD 
(0.12 lower to 0.12 higher) ⨁⨁◯◯
Lowa, c, d The evidence suggests that HD‐ICS/LABA results in little to no difference in CFB in ACQ at 12 months compared to MD‐ICS/LABA.
CFB in ACQ at 12 months ‐ MD TRIPLE vs MD‐ICS/LABA
№ of participants: 1366
(2 RCTs) ‐0.93 MD 0.01 lower
(0.11 lower to 0.08 higher) ⨁⨁⨁◯
Moderatea, d MD TRIPLE likely results in little to no difference in CFB in ACQ at 12 months compared to MD‐ICS/LABA.
CFB in ACQ at 12 months ‐ HD TRIPLE vs MD‐ICS/LABA
№ of participants: 1379
(2 RCTs) ‐0.93 MD 0.09 lower
(0.23 lower to 0.06 higher) ⨁⨁⨁◯
Moderatea, d HD TRIPLE likely results in little to no difference in CFB in ACQ at 12 months compared to MD‐ICS/LABA.
CFB in ACQ at 12 months ‐ MD TRIPLE vs HD‐ICS/LABA
№ of participants: 1967
(2 RCTs) ‐1.03 MD 0.01 higher
(0.2 lower to 0.21 higher) ⨁⨁◯◯
Lowa, c, d The evidence suggests that MD TRIPLE results in little to no difference in CFB in ACQ at 12 months compared to HD‐ICS/LABA.
CFB in ACQ at 12 months ‐ HD TRIPLE vs HD‐ICS/LABA
№ of participants: 2887
(3 RCTs) ‐0.89 MD 0.07 lower
(0.15 lower to 0) ⨁⨁⨁◯
Moderatea, d HD TRIPLE likely results in little to no difference in CFB in ACQ at 12 months compared to HD‐ICS/LABA.
CFB in ACQ at 12 months ‐ HD TRIPLE vs MD TRIPLE
№ of participants: 1381
(2 RCTs) ‐0.94 MD 0.07 lower
(0.23 lower to 0.09 higher) ⨁⨁⨁◯
Moderatea, d HD TRIPLE likely results in little to no difference in CFB in ACQ at 12 months compared to MD TRIPLE.
CFB in ACQ at 12 months ‐ DUAL vs TRIPLE
№ of participants: 4253
(4 RCTs) ‐0.91 MD 0.04 lower
(0.1 lower to 0.02 higher) ⨁⨁⨁◯
Moderatea, d TRIPLE likely results in little to no difference in CFB in ACQ at 12 months compared to DUAL.
‡ ACQ scores range from 0 to 6 with lower scores indicating better asthma control.
*The effect in the intervention group (and its 95% confidence interval) is based on the assumed effect in the comparison group and the relative effect of the intervention (and its 95% CI).
† Minimal Clinically Important Difference is 0.5
GRADE Working Group grades of evidenceHigh certainty: we are very confident that the true effect lies close to that of the estimate of the effect.
Moderate certainty: we are moderately confident in the effect estimate: the true effect is likely to be close to the estimate of the effect, but there is a possibility that it is substantially different.
Low certainty: our confidence in the effect estimate is limited: the true effect may be substantially different from the estimate of the effect.
Very low certainty: we have very little confidence in the effect estimate: the true effect is likely to be substantially different from the estimate of effect.
Explanations
a. Optimal information size is not met (Guyatt 2011b)
b. Total size of less than 1000 participants may suggest small study effect (Dechartres 2013)
c. Substantial heterogeneity I2 > 50% to 90%
d. Lee 2020 had very high attrition rates and is considered at high risk of bias. However, excluding the study did not change the results.

ACQ:Asthma Control Questionnaire; CFB: change from baseline; CI: confidence interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta2 agonist; MD: mean difference; MD: medium dose; RCT: randomised controlled trial.

Summary of findings 8. NMA Summary of Findings for change from baseline in AQLQ scores at 6 months.

Patient or population: Adolescents and adults with symptomatic asthma
Interventions: HD‐ICS/LABA, MD‐TRIPLE, HD‐TRIPLE
Comparator (reference): Medium‐Dose ICS/LABA (MD‐ICS/LABA)
Outcome: Change from baseline in AQLQ score at 6 months
Setting(s): Outpatient
Geometry of the Network in Figure 6*
Total studies: 4 RCTs
Total Participants: 3454
Relative effect
(95% CrI)
Anticipated absolute effect**(95% CrI) Certainty of the evidence Ranking***
(95% CrI)
Interpretation of Findings
With intervention Difference compared to MD‐ICS/LABA1
HD‐ICS/LABA
 
(Direct evidence; 1 RCT; 1223 participants)
‐0.06
(‐0.14 to 0.03)
0.71
(0.63 to 0.80)
Change from baseline in AQLQ score was 0.06 lower (0.14 lower to 0.03 higher) ⊕⊕⊕◯
Moderate
Due to imprecision2
4.0
(2.0 to 4.0)
Probably little or no clinically meaningful difference4
MD‐TRIPLE
 
(Direct evidence; 0 RCTs; 0 participants)
0.03
(‐0.23 to 0.29)
0.80
(0.54 to 1.06)
Change from baseline in AQLQ score was 0.03 higher (0.23 lower to 0.29 higher) ⊕⊕◯◯
Low
Due to imprecision3
2.0
(1.0 to 4.0)
Suggest little or no clinically meaningful difference4
HD‐TRIPLE
 
(Direct evidence; 0 RCTs; 0 participants)
0.11
(‐0.09 to 0.30)
0.88
(0.68 to 1.07)
Change from baseline in AQLQ score was 0.11 higher (0.09 lower to 0.30 higher) ⊕⊕◯◯
Low
Due to imprecision3
1.0
(1.0 to 3.0)
Suggest little or no clinically meaningful difference4
MD‐ICS/LABA Reference Comparator1 0.77 Reference Comparator Reference Comparator 3.0
(1.0 to 4.0)
Reference Comparator
NMA‐SoF table definitions
* The size of the nodes and the thickness of edges depend on the number of people randomised and the number of trials conducted.
** Estimates are reported as mean difference and credible interval (CrI). Results are expressed in credible intervals as opposed to the confidence intervals since a Bayesian analysis has been conducted.
*** Ranking and confidence intervals for efficacy outcome are presented. Rank statistics is defined as the probabilities that a treatment out of n treatments in a network meta‐analysis is the best, the second, the third and so on until the least effective treatment.
GRADE Working Group grades of evidence (or certainty in the evidence)
High certainty: We are very confident that the true effect lies close to that of the estimate of the effect
Moderate certainty: We are moderately confident in the effect estimate: The true effect is likely to be close to the estimate of the effect, but there is a possibility that it is substantially different
Low certainty: Our confidence in the effect estimate is limited: The true effect may be substantially different from the estimate of the effect
Very low certainty: We have very little confidence in the effect estimate: The true effect is likely to be substantially different from the estimate of effect
Explanatory Footnotes
1 The mean change from baseline in AQLQ scores was 0.77 with MD‐ICS/LABA.
2 Serious imprecision due to small sample sizes in the direct and/or indirect estimate(s).
3 Very serious imprecision due to very small sample sizes in the indirect estimate.
4 Minimal clinically important difference is 0.5.

AQLQ: Asthma Quality of Life Questionnaire; CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta2 agonist; MD: medium dose; NMA: network meta‐analysis; RCT: randomised controlled trial.

6.

6

Network diagram for change from baseline AQLQ scores at 6 months for grouped interventions.

The size of the nodes and the thickness of edges depend on the number of people randomised and the number of trials conducted. HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

Summary of findings 9. NMA Summary of Findings for change from baseline in AQLQ scores at 12 months.

Patient or population: Adolescents and adults with symptomatic asthma
Interventions: HD‐ICS/LABA, MD‐TRIPLE, HD‐TRIPLE
Comparator (reference): Medium‐Dose ICS/LABA (MD‐ICS/LABA)
Outcome: Change from baseline in AQLQ score at 12 months
Setting(s): Outpatient
Geometry of the Network in Figure 7*
Total studies: 4 RCTs
Total Participants: 4809
Relative effect
(95% CrI)
Anticipated absolute effect**(95% CrI) Certainty of the evidence Ranking***
(95% CrI)
Interpretation of Findings
With intervention Difference compared to MD‐ICS/LABA1
HD‐ICS/LABA
 
(Direct evidence; 2 RCTs; 2815 participants)
‐0.02
(‐0.09 to 0.04)
0.81
(0.74 to 0.87)
Change from baseline in AQLQ score was 0.02 lower (0.09 lower to 0.04 higher) ⊕⊕⊕◯
Moderate
Due to imprecision2
3.0
(2.0 to 4.0)
Probably little or no clinically meaningful difference3
MD‐TRIPLE
 
(Direct evidence; 1 RCT; 1071 participants)
‐0.08
(‐0.17 to 0.02)
0.75
(0.66 to 0.85)
Change from baseline in AQLQ score was 0.08 lower (0.17 lower to 0.12 higher) ⊕⊕⊕◯
Moderate
Due to imprecision2
4.0
(2.0 to 4.0)
Probably little or no clinically meaningful difference3
HD‐TRIPLE
 
(Direct evidence; 1 RCT; 1088 participants)
0.05
(‐0.04 to 0.13)
0.88
(0.79 to 0.13)
Change from baseline in AQLQ score was 0.05 higher (0.04 lower to 0.13 higher) ⊕⊕⊕◯
Moderate
Due to imprecision2
1.0
(1.0 to 3.0)
Probably little or no clinically meaningful difference3
MD‐ICS/LABA Reference Comparator1 0.83 Reference Comparator Reference Comparator 2.0
(1.0 to 4.0)
Reference Comparator
NMA‐SoF table definitions
* The size of the nodes and the thickness of edges depend on the number of people randomised and the number of trials conducted, respectively.
** Estimates are reported as mean difference and credible interval (CrI). Results are expressed in credible intervals as opposed to the confidence intervals since a Bayesian analysis has been conducted.
*** Ranking and confidence intervals for efficacy outcome are presented. Rank statistics is defined as the probabilities that a treatment out of n treatments in a network meta‐analysis is the best, the second, the third and so on until the least effective treatment.
GRADE Working Group grades of evidence (or certainty in the evidence)
High certainty: We are very confident that the true effect lies close to that of the estimate of the effect
Moderate certainty: We are moderately confident in the effect estimate: The true effect is likely to be close to the estimate of the effect, but there is a possibility that it is substantially different
Low certainty: Our confidence in the effect estimate is limited: The true effect may be substantially different from the estimate of the effect
Very low certainty: We have very little confidence in the effect estimate: The true effect is likely to be substantially different from the estimate of effect
Explanatory Footnotes
1 The mean change from baseline in ACQ scores was 0.83 with MD‐ICS/LABA.
2 Serious imprecision due to small sample sizes in the direct and/or indirect estimate(s).
3 Minimal clinically important difference is 0.5.

AQLQ: Asthma Quality of Life Questionnaire; CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta2 agonist; MD: medium dose; NMA: network meta‐analysis; RCT: randomised controlled trial.

7.

7

Network diagram for change from baseline AQLQ scores at 12 months for grouped interventions.

The size of the nodes and the thickness of edges depend on the number of people randomised and the number of trials conducted. HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

Summary of findings 10. Asthma Quality of Life Questionnaire: change from baseline ‐ pairwise comparisons .

Outcome№ of participants(studies) Relative effect(95% CI) Anticipated absolute effects (95% CI)* Certainty of the evidence What happens†
With active control Difference
CFB in AQLQ at 6 months ‐ HD‐ICS/LABA vs MD‐ICS/LABA
№ of participants: 1223
(1 RCT) 0.77 MD 0.06 lower
(0.14 lower to 0.03 higher) ⨁⨁⨁◯
Moderatea HD‐ICS/LABA likely results in little to no difference in CFB in AQLQ at 6 months compared to MD‐ICS/LABA.
CFB in AQLQ at 6 months ‐ HD TRIPLE vs HD‐ICS/LABA
№ of participants: 907
(2 RCTs) 0.32
MD 0.16 higher
(0.01 lower to 0.34 higher) ⨁⨁◯◯
Lowa, b The evidence suggests that HD TRIPLE results in little to no difference in CFB in AQLQ at 6 months compared to HD‐ICS/LABA.
CFB in AQLQ at 6 months ‐ HD TRIPLE vs MD TRIPLE
№ of participants: 1426
(1 RCT) 0.71 MD 0.08 higher
(0.09 lower to 0.25 higher) ⨁⨁⨁◯
Moderatea HD TRIPLE likely results in little to no difference in CFB in AQLQ at 6 months compared to MD‐ICS/LABA.
CFB in AQLQ at 6 months ‐ TRIPLE vs DUAL
№ of participants: 907
(2 RCTs) 0.32 MD 0.16 higher
(0.01 lower to 0.34 higher) ⨁⨁◯◯
Lowa The evidence suggests that TRIPLE results in little to no difference in CFB in AQLQ at 6 months compared to DUAL.
CFB in AQLQ at 12 months ‐ HD‐ICS/LABA vs MD‐ICS/LABA
№ of participants: 2815
(2 RCTs) 0.83 MD 0.02 lower
(0.08 lower to 0.04 higher) ⨁⨁⨁◯
Moderatea HD‐ICS/LABA likely results in little to no difference in CFB in AQLQ at 12 months compared to MD‐ICS/LABA.
CFB in AQLQ at 12 months ‐ MD TRIPLE vs MD‐ICS/LABA
№ of participants: 1071
(1 RCT) 0.81 MD 0.05 lower
(0.15 lower to 0.05 higher) ⨁⨁⨁◯
Moderatea MD TRIPLE likely results in little to no difference in CFB in AQLQ at 12 months compared to MD‐ICS/LABA.
CFB in AQLQ at 12 months ‐ HD TRIPLE vs MD‐ICS/LABA
№ of participants: 1088
(1 RCT) 0.81 MD 0.06 higher
(0.04 lower to 0.16 higher) ⨁⨁⨁◯
Moderatea HD TRIPLE likely results in little to no difference in CFB in AQLQ at 12 months compared to MD‐ICS/LABA.
CFB in AQLQ at 12 months ‐ MD TRIPLE vs HD‐ICS/LABA
№ of participants: 1628
(1 RCT) 0.83 MD 0.07 lower
(0.16 lower to 0.02 higher) ⨁⨁⨁◯
Moderatea HD‐ICS/LABA likely results in little to no difference in CFB in AQLQ at 12 months compared to MD‐ICS/LABA.
CFB in AQLQ at 12 months ‐ HD TRIPLE vs HD‐ICS/LABA
№ of participants: 2552
(3 RCTs) 0.70 MD 0.06 higher
(0.02 lower to 0.14 higher) ⨁⨁⨁◯
Moderatea MD TRIPLE likely results in little to no difference in CFB in AQLQ at 12 months compared to HD‐ICS/LABA.
CFB in AQLQ at 12 months ‐ HD TRIPLE vs MD TRIPLE
№ of participants: 1087
(1 RCT) 0.76 MD 0.11 higher
(0.01 higher to 0.21 higher) ⨁⨁⨁◯
Moderatea HD TRIPLE likely results in little to no difference in CFB in AQLQ at 12 months compared to MD TRIPLE.
CFB in AQLQ at 12 months ‐ TRIPLE vs DUAL
№ of participants: 3623
(3 RCTs) 0.73 MD 0.01 higher
(0.05 lower to 0.07 higher) ⨁⨁⨁◯
Moderatea TRIPLE likely results in little to no difference in CFB in AQLQ at 12 months compared to DUAL.
‡ AQLQ scores range from 1 to 7 with higher scores indicating better asthma control.
*The effect in the intervention group (and its 95% confidence interval) is based on the assumed effect in the comparison group and the relative effect of the intervention (and its 95% CI).
† Minimal Clinically Important Difference is 0.5
GRADE Working Group grades of evidenceHigh certainty: we are very confident that the true effect lies close to that of the estimate of the effect.
Moderate certainty: we are moderately confident in the effect estimate: the true effect is likely to be close to the estimate of the effect, but there is a possibility that it is substantially different.
Low certainty: our confidence in the effect estimate is limited: the true effect may be substantially different from the estimate of the effect.
Very low certainty: we have very little confidence in the effect estimate: the true effect is likely to be substantially different from the estimate of effect.
Explanations
a. Optimal information size is not met (Guyatt 2011b)
b. Total size of less than 1000 participants may suggest small study effect (Dechartres 2013)

AQLQ: Asthma Quality of Life Questionnaire; CFB: change from baseline; CI: confidence interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta2 agonist; MD: mean difference; MD: medium dose; RCT: randomised controlled trial.

Summary of findings 11. NMA Summary of Findings for ACQ responders at 6 months.

Patient or population: Adolescents and adults with symptomatic asthma
Interventions: HD‐ICS/LABA, MD‐TRIPLE, HD‐TRIPLE
Comparator (reference): Medium‐Dose ICS/LABA (MD‐ICS/LABA)
Outcome: ACQ responders at 6 months
Setting(s): Outpatient
Geometry of the Network in Figure 8*
Total studies: 7 RCTs
Total Participants: 10453
Risk ratio**
(95% CrI)
Anticipated absolute effect***(95% CrI) Certainty of the evidence Ranking****
(95% CrI)
Interpretation of Findings
With intervention Difference compared to MD‐ICS/LABA
HD‐ICS/LABA
 
(Direct evidence; 3 RCTs; 3700 participants)
1.05
(0.92 to 1.20)
632 per 1000 12 per 1000 more
(from 19 fewer to 43 more)
⊕⊕⊕◯
Moderate
Due to imprecision1
3.0
(3.0 to 4.0)
Probably little or no difference
MD‐TRIPLE
 
(Direct evidence; 3 RCTs; 3063 participants)
1.25
(1.09 to 1.44)
670 per 1000 50 per 1000 more
(from 19 more to 81 more)
⊕⊕◯◯
Low
Due to imprecision1 and heterogeneity2
1.0
(1.0 to 2.0)
Possibly superior
HD‐TRIPLE
 
(Direct evidence; 2 RCTs; 1916 participants)
1.25
(1.07 to 1.45)
670 per 1000 50 per 1000 more
(19 more to 81 more)
⊕⊕◯◯
Low
Due to imprecision1 and heterogeneity2
2.0
(1.0 to 2.0)
Possibly superior
MD‐ICS/LABA Reference Comparator 620 per 10003 Reference Comparator Reference Comparator 4.0
(3.0 to 4.0)
Reference Comparator
NMA‐SoF table definitions
* The size of the nodes and the thickness of edges depend on the number of people randomised and the number of trials conducted, respectively.
** Network Meta‐Analysis estimates are reported as risk ratio. Results are expressed in credible intervals as opposed to the confidence intervals since a Bayesian analysis has been conducted.
*** Anticipated absolute effect. Anticipated absolute effect compares two rates by calculating the difference between the rates of the intervention group with the rate of MD‐ICS/LABA group.
**** Median and credible intervals are presented. Rank statistics is defined as the probabilities that a treatment out of n treatments in a network meta‐analysis is the best, the second, the third and so on until the least effective treatment.
GRADE Working Group grades of evidence (or certainty in the evidence)
High certainty: We are very confident that the true effect lies close to that of the estimate of the effect
Moderate certainty: We are moderately confident in the effect estimate: The true effect is likely to be close to the estimate of the effect, but there is a possibility that it is substantially different
Low certainty: Our confidence in the effect estimate is limited: The true effect may be substantially different from the estimate of the effect
Very low certainty: We have very little confidence in the effect estimate: The true effect is likely to be substantially different from the estimate of effect
Explanatory Footnotes
1 Serious imprecision due to suboptimal sample size in the direct and/or indirect estimate(s).
2 Serious heterogeneity in the direct estimate.
3 Based on the average rate in participants treated with MD‐ICS/LABA in the included studies.

ACQ: Asthma Control Questionnaire; CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta2 agonist; MD: medium dose; NMA: network meta‐analysis; RCT: randomised controlled trial.

8.

8

Network diagram for ACQ Responders at 6 months for grouped interventions.

The size of the nodes and the thickness of edges depend on the number of people randomised and the number of trials conducted. HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

Summary of findings 12. NMA Summary of Findings for ACQ responders at 12 months.

Patient or population: Adolescents and adults with symptomatic asthma
Interventions: HD‐ICS/LABA, MD‐TRIPLE, HD‐TRIPLE
Comparator (reference): Medium‐Dose ICS/LABA (MD‐ICS/LABA)
Outcome: ACQ responders at 12 months
Geometry of the Network in Figure 9*
Total studies: 5 RCTs
Total Participants: 7391
Risk ratio**
(95% CrI)
Anticipated absolute effect***(95% CrI) Certainty of the evidence Ranking****
(95% CrI)
Interpretation of Findings
With intervention Difference compared to MD‐ICS/LABA
HD‐ICS/LABA
 
(Direct evidence; 2 RCTs; 2817 participants)
1.00
(0.94 to 1.05)
676 per 1000 0 per 1000 fewer
(from 41 fewer to 30 more)
⊕⊕⊕◯
Moderate
Due to imprecision1
3.0
(2.0 to 4.0)
Probably little or no difference
MD‐TRIPLE
 
(Direct evidence; 2 RCTs; 2237 participants)
0.99
(0.94 to 1.05)
669 per 1000 7 per 1000 more
(from 41 fewer to 34 more)
⊕⊕⊕◯
Moderate
Due to imprecision1
3.0
(2.0 to 4.0)
Probably little or no difference
HD‐TRIPLE
 
(Direct evidence; 1 RCT; 1088 participants)
1.08
(1.02 to 1.14)
730 per 1000 54 per 1000 more
(14 more to 95 more)
⊕⊕⊕◯
Moderate
Due to imprecision2
1.0
(1.0 to 1.0)
Probably superior
MD‐ICS/LABA Reference Comparator 676 per 10003 Reference Comparator Reference Comparator 3.0
(2.0 to 4.0)
Reference Comparator
NMA‐SoF table definitions
* The size of the nodes and the thickness of edges depend on the number of people randomised and the number of trials conducted, respectively.
** Network Meta‐Analysis estimates are reported as risk ratio. Results are expressed in credible intervals as opposed to the confidence intervals since a Bayesian analysis has been conducted.
*** Anticipated absolute effect. Anticipated absolute effect compares two rates by calculating the difference between the rates of the intervention group with the rate of MD‐ICS/LABA group.
**** Median and credible intervals are presented. Rank statistics is defined as the probabilities that a treatment out of n treatments in a network meta‐analysis is the best, the second, the third and so on until the least effective treatment.
GRADE Working Group grades of evidence (or certainty in the evidence)
High certainty: We are very confident that the true effect lies close to that of the estimate of the effect
Moderate certainty: We are moderately confident in the effect estimate: The true effect is likely to be close to the estimate of the effect, but there is a possibility that it is substantially different
Low certainty: Our confidence in the effect estimate is limited: The true effect may be substantially different from the estimate of the effect
Very low certainty: We have very little confidence in the effect estimate: The true effect is likely to be substantially different from the estimate of effect
Explanatory Footnotes
1 Serious imprecision due to suboptimal sample size in the direct and/or indirect estimate(s).
2 Serious imprecision due 95% CI or CrI including the null effect in the direct and/or indirect estimate(s).
3 Based on the average rate in participants treated with MD‐ICS/LABA in the included studies.

ACQ: Asthma Control Questionnaire; CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta2 agonist; MD: medium dose; NMA: network meta‐analysis; RCT: randomised controlled trial.

9.

9

Network diagram for ACQ responders at 12 months for grouped interventions.

The size of the nodes and the thickness of edges depend on the number of people randomised and the number of trials conducted. HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

Summary of findings 13. Asthma Control Questionnaire responders ‐ pairwise comparisons.

Outcome
№ of participants
(studies) Relative effect
(95% CI) Anticipated absolute effects* (95% CI) Certainty of the evidence What happens
With active control With experimental comparator Difference
ACQ responders at 6 months ‐ HD‐ICS/LABA vs MD‐ICS/LABA
№ of participants: 3700
(3 RCTs) RR 1.02
(0.96 to 1.08) 66.8% 68.1%
(64.1 to 72.2) 1.3% more
(2.7 fewer to 5.3 more) ⨁⨁⨁◯
Moderatea, b HD‐ICS/LABA likely results in little to no difference in ACQ responders at 6 months compared to MD‐ICS/LABA.
ACQ responders at 6 months ‐ MD TRIPLE vs MD‐ICS/LABA
№ of participants: 3063
(3 RCTs) RR 1.09
(0.99 to 1.19) 58.3% 63.5%
(57.7 to 69.3) 5.2% more
(0.6 fewer to 11.1 more) ⨁⨁◯◯
Lowc, d The evidence suggests MD TRIPLE increases ACQ responders at 6 months compared to MD‐ICS/LABA.
ACQ responders at 6 months ‐ HD TRIPLE vs MD‐ICS/LABA
№ of participants: 1916
(2 RCTs) RR 1.11
(0.91 to 1.35) 62.8% 69.7%
(57.2 to 84.8) 6.9% more
(5.7 fewer to 22 more) ⨁◯◯◯
Very lowe, f HD TRIPLE may increase ACQ responders at 6 months compared to MD‐ICS/LABA, but the evidence is very uncertain.
ACQ responders at 6 months ‐ MD TRIPLE vs HD‐ICS/LABA
№ of participants: 2480
(2 RCTs) RR 1.02
(0.97 to 1.08) 67.5% 68.9%
(65.5 to 72.9) 1.4% more
(2 fewer to 5.4 more) ⨁⨁⨁◯
Moderateb MD TRIPLE likely results in little to no difference in ACQ responders at 6 months compared to HD‐ICS/LABA.
ACQ responders at 6 months ‐ HD TRIPLE vs HD‐ICS/LABA
№ of participants: 4818
(4 RCTs) RR 1.07
(1.01 to 1.14) 61.2% 65.5%
(61.8 to 69.8) 4.3% more
(0.6 more to 8.6 more) ⨁⨁⨁◯
Moderateb HD TRIPLE likely results in little to no difference in ACQ responders at 6 months compared to HD‐ICS/LABA.
ACQ responders at 6 months ‐ HD TRIPLE vs MD TRIPLE
№ of participants: 2821
(3 RCTs) RR 0.99
(0.95 to 1.03) 73.2% 72.5%
(69.6 to 75.4) 0.7% fewer
(3.7 fewer to 2.2 more) ⨁⨁⨁◯
Moderateb HD TRIPLE likely results in little to no difference in ACQ responders at 6 months compared to MD TRIPLE.
ACQ responders at 6 months ‐ TRIPLE vs DUAL
№ of participants: 7881
(5 RCTs) RR 1.09
(1.02 to 1.15) 60.1% 65.5%
(61.3 to 69.1) 5.4% more
(1.2 more to 9 more) ⨁⨁◯◯
Lowb, c The evidence suggests TRIPLE increases ACQ responders at 6 months compared to DUAL.
ACQ responders at 12 months ‐ HD‐ICS/LABA vs MD‐ICS/LABA
№ of participants: 2817
(2 RCTs) RR 0.99
(0.90 to 1.07) 77.0% 76.2%
(69.3 to 82.3) 0.8% fewer
(7.7 fewer to 5.4 more) ⨁⨁◯◯
Lowa, b, c HD‐ICS/LABA likely results in little to no difference in ACQ responders at 12 months compared to MD‐ICS/LABA.
ACQ responders at 12 months ‐ MD TRIPLE vs MD‐ICS/LABA
№ of participants: 2222
(2 RCTs) RR 1.01
(0.95 to 1.07) 65.9% 66.6%
(62.6 to 70.6) 0.7% more
(3.3 fewer to 4.6 more) ⨁⨁⨁◯
Moderateb MD TRIPLE likely results in little to no difference in ACQ responders at 12 months compared to MD‐ICS/LABA.
ACQ responders at 12 months ‐ HD TRIPLE vs MD‐ICS/LABA
№ of participants: 1088
(1 RCT) RR 1.08
(1.01 to 1.15) 73.1% 79.0%
(73.9 to 84.1) 5.9% more
(0.7 more to 11 more) ⨁⨁⨁◯
Moderateb HD TRIPLE likely results in an increase in ACQ responders at 12 months compared to MD‐ICS/LABA.
ACQ responders at 12 months ‐ MD TRIPLE vs HD‐ICS/LABA
№ of participants: 1631
(1 RCT) RR 0.97
(0.91 to 1.03) 75.3% 73.1%
(68.5 to 77.6) 2.3% fewer
(6.8 fewer to 2.3 more) ⨁⨁⨁◯
Moderateb MD TRIPLE likely results in little to no difference in ACQ responders at 12 months compared to HD‐ICS/LABA.
ACQ responders at 12 months ‐ HD TRIPLE vs HD‐ICS/LABA
№ of participants: 3982
(3 RCTs) RR 1.11
(0.99 to 1.23) 64.2% 71.3%
(63.6 to 79) 7.1% more
(0.6 fewer to 14.8 more) ⨁◯◯◯
Very lowb, c, d HD TRIPLE may increase ACQ responders at 12 months compared to HD‐ICS/LABA, but the evidence is very uncertain.
ACQ responders at 12 months ‐ HD TRIPLE vs MD TRIPLE
№ of participants: 1089
(1 RCT) RR 1.08
(1.01 to 1.16) 72.8% 78.6%
(73.5 to 84.5) 5.8% more
(0.7 more to 11.6 more) ⨁⨁⨁◯
Moderateb HD TRIPLE likely increases ACQ responders at 12 months compared to MD TRIPLE.
ACQ responders at 12 months ‐ TRIPLE vs DUAL
№ of participants: 6204
(4 RCTs) RR 1.07
(0.99 to 1.17) 64.8% 69.4%
(64.2 to 75.8) 4.5% more
(0.6 fewer to 11 more) ⨁◯◯◯
Very lowb, c, d TRIPLE may increase ACQ responders at 12 months compared to DUAL, but the evidence is very uncertain.
*The risk in the intervention group (and its 95% confidence interval) is based on the assumed risk in the comparison group and the relative effect of the intervention (and its 95% CI).
GRADE Working Group grades of evidenceHigh certainty: we are very confident that the true effect lies close to that of the estimate of the effect.
Moderate certainty: we are moderately confident in the effect estimate: the true effect is likely to be close to the estimate of the effect, but there is a possibility that it is substantially different.
Low certainty: our confidence in the effect estimate is limited: the true effect may be substantially different from the estimate of the effect.
Very low certainty: we have very little confidence in the effect estimate: the true effect is likely to be substantially different from the estimate of effect.
Explanations
a. van Zyl‐Smit 2020 had very high attrition rates and is considered at high risk of bias. However, excluding the study did not change the results.
b. Optimal information size is not met (Guyatt 2011b)
c. Substantial heterogeneity I2 > 50% to 90%
d. Confidence interval includes the line of no effect
e. Considerable heterogeneity. I2 >75% to 100%
f. Confidence intervals include clinically important outcomes.

ACQ: Asthma Control Questionnaire; CI: confidence interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta2 agonist; MD: medium dose; RCT: randomised controlled trial; RR: risk ratio.

Summary of findings 14. NMA Summary of Findings for all‐cause SAEs.

Patient or population: Adolescents and adults with symptomatic asthma
Interventions: HD‐ICS/LABA, MD‐TRIPLE, HD‐TRIPLE
Comparator (reference): Medium‐Dose ICS/LABA (MD‐ICS/LABA)
Outcome: All‐cause serious adverse events (SAEs)
Setting(s): Outpatient
Geometry of the Network in Figure 10*
Total studies: 13 RCTs
Total Participants: 144476
Risk ratio**
(95% CrI)
Anticipated absolute effect***(95% CrI) Certainty of the evidence Ranking****
(95% CrI)
Interpretation of Findings
With intervention Difference compared to MD‐ICS/LABA
HD‐ICS/LABA
 
(Direct evidence; 8 RCTs; 7511 participants)
1.06
(0.86 to 1.33)
54 per 1000 3 per 1000 more
(from 7 fewer to 16 more)
⊕⊕⊕⊕
High
3.0
(1.0 to 4.0)
Little or no difference
MD‐TRIPLE
 
(Direct evidence; 3 RCTs; 3187 participants)
1.10
(0.84 to 1.45)
56 per 1000 5 per 1000 more
(from 8 fewer to 21 more)
⊕⊕⊕◯
Moderate
Due to imprecision1
3.0
(1.0 to 4.0)
Probably little or no difference
HD‐TRIPLE
 
(Direct evidence; 2 RCT; 2039 participants)
1.05
(0.81 to 1.64)
54 per 1000 3 per 1000 more
(from 10 fewer to 33 more)
⊕⊕⊕◯
Moderate
Due to imprecision1
2.0
(1.0 to 4.0)
Probably little or no difference
MD‐ICS/LABA Reference Comparator 51 per 10002 Reference Comparator Reference Comparator 2.0
(1.0 to 4.0)
Reference Comparator
NMA‐SoF table definitions
* The size of the nodes and the thickness of edges depend on the number of people randomised and the number of trials conducted, respectively.
** Network Meta‐Analysis estimates are reported as risk ratio. Results are expressed in credible intervals as opposed to the confidence intervals since a Bayesian analysis has been conducted.
*** Anticipated absolute effect. Anticipated absolute effect compares two rates by calculating the difference between the rates of the intervention group with the rate of MD‐ICS/LABA group.
**** Median and credible intervals are presented. Rank statistics is defined as the probabilities that a treatment out of n treatments in a network meta‐analysis is the best, the second, the third and so on until the least effective treatment.
GRADE Working Group grades of evidence (or certainty in the evidence)
High certainty: We are very confident that the true effect lies close to that of the estimate of the effect
Moderate certainty: We are moderately confident in the effect estimate: The true effect is likely to be close to the estimate of the effect, but there is a possibility that it is substantially different
Low certainty: Our confidence in the effect estimate is limited: The true effect may be substantially different from the estimate of the effect
Very low certainty: We have very little confidence in the effect estimate: The true effect is likely to be substantially different from the estimate of effect
Explanatory Footnotes
1 Serious imprecision due to wide confidence intervals in the direct and/or indirect estimate(s).
2 Based on the average rate in participants treated with MD‐ICS/LABA in the included studies.

CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta2 agonist; MD: medium dose; NMA: network meta‐analysis; RCT: randomised controlled trial; SAE: serious adverse event.

10.

10

Network diagram for all‐cause SAEs for grouped interventions.

The size of the nodes and the thickness of edges depend on the number of people randomised and the number of trials conducted. HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

Summary of findings 15. Serious adverse events, adverse events, and dropouts due to adverse event ‐ pairwise comparisons.

Outcome
№ of participants
(studies) Relative effect
(95% CI) Anticipated absolute effects* (95% CI) Certainty of the evidence What happens
With active control With experimental comparator Difference
All cause SAEs ‐ HD‐ICS/LABA vs MD‐ICS LABA
№ of participants: 7511
(8 RCTs)
Follow up: 3 to 12 months
RR 1.03
(0.83 to 1.29) 4.4% 4.5%
(3.6 to 5.6) 0.1% more
(0.7 fewer to 1.3 more) ⨁⨁⨁⨁
High HD‐ICS/LABA results in little to no difference in all cause SAEs compared to MD‐ICS LABA.
All cause SAEs ‐ MD TRIPLE vs MD‐ICS/LABA
№ of participants: 3187
(3 RCTs)
Follow up: 12 months
RR 1.13
(0.85 to 1.50) 5.3% 6.0%
(4.5 to 8) 0.7% more
(0.8 fewer to 2.7 more) ⨁⨁⨁◯
Moderatea MD TRIPLE likely results in little to no difference in all cause SAEs compared to MD‐ICS/LABA.
All cause SAEs ‐ HD TRIPLE vs MD‐ICS/LABA
№ of participants: 2039
(2 RCTs)
Follow up: 12 months
RR 1.05
(0.76 to 1.47) 6.2% 6.5%
(4.7 to 9.1) 0.3% more
(1.5 fewer to 2.9 more) ⨁⨁⨁◯
Moderatea HD TRIPLE likely results in little to no difference in all cause SAEs compared to MD‐ICS/LABA.
All cause SAEs ‐ MD TRIPLE vs HD‐ICS/LABA
№ of participants: 2660
(2 RCTs)
Follow up: 12 months
RR 1.08
(0.81 to 1.44) 6.8% 7.4%
(5.5 to 9.9) 0.5% more
(1.3 fewer to 3 more) ⨁⨁⨁◯
Moderatea MD TRIPLE likely results in little to no difference in all cause SAEs compared to HD‐ICS/LABA.
All cause SAEs ‐ HD TRIPLE vs HD‐ICS/LABA
№ of participants: 5004
(4 RCTs)
Follow up: 12 months
RR 0.95
(0.77 to 1.18) 6.9% 6.6%
(5.3 to 8.2) 0.3% fewer
(1.6 fewer to 1.2 more) ⨁⨁⨁◯
Moderatea HD TRIPLE likely results in little to no difference in all cause SAEs compared to HD‐ICS/LABA.
All cause SAEs ‐ HD TRIPLE vs MD TRIPLE
№ of participants: 2998
(3 RCTs)
Follow up: 6 to 12 months
RR 0.96
(0.72 to 1.27) 6.0% 5.8%
(4.3 to 7.6) 0.2% fewer
(1.7 fewer to 1.6 more) ⨁⨁⨁◯
Moderatea HD TRIPLE likely results in little to no difference in all cause SAEs compared to MD TRIPLE.
All cause SAEs ‐ TRIPLE vs DUAL
№ of participants: 8192
(6 RCTs)
Follow up: 12 months
RR 1.03
(0.87 to 1.21) 6.3% 6.5%
(5.5 to 7.7) 0.2% more
(0.8 fewer to 1.3 more) ⨁⨁⨁⨁
High TRIPLE results in little to no difference in all cause SAEs compared to DUAL.
Asthma‐related SAEs ‐ HD‐ICS/LABA vs MD‐ICS LABA
№ of participants: 6244
(6 RCTs)
Follow up: 3 to 12 months
RR 1.33
(0.80 to 2.21) 1.1% 1.5%
(0.9 to 2.5) 0.4% more
(0.2 fewer to 1.4 more) ⨁⨁⨁⨁
High HD‐ICS/LABA results in little to no difference in asthma‐related SAEs compared to MD‐ICS LABA.
Asthma‐related SAEs ‐ MD TRIPLE vs MD‐ICS/LABA
№ of participants: 3188
(3 RCTs)
Follow up: 12 months
RR 1.52
(0.85 to 2.69) 1.2% 1.8%
(1 to 3.2) 0.6% more
(0.2 fewer to 2 more) ⨁⨁⨁◯
Moderatea MD TRIPLE likely results in little to no difference in asthma‐related SAEs compared to MD‐ICS/LABA.
Asthma‐related SAEs ‐ HD TRIPLE vs MD‐ICS/LABA
№ of participants: 2039
(2 RCTs)
Follow up: 12 months
RR 0.86
(0.41 to 1.80) 1.5% 1.3%
(0.6 to 2.7) 0.2% fewer
(0.9 fewer to 1.2 more) ⨁⨁⨁⨁
High HD TRIPLE results in little to no difference in asthma‐related SAEs compared to MD‐ICS LABA.
Asthma‐related SAEs ‐ MD TRIPLE vs HD‐ICS/LABA
№ of participants: 2660
(2 RCTs)
Follow up: 12 months
RR 1.35
(0.77 to 2.36) 1.6% 2.2%
(1.3 to 3.9) 0.6% more
(0.4 fewer to 2.2 more) ⨁⨁⨁◯
Moderatea Safety outcomes likely results in little to no difference in asthma‐related SAEs ‐ MD TRIPLE vs HD‐ICS/LABA.
Asthma‐related SAEs ‐ HD TRIPLE vs HD‐ICS/LABA
№ of participants: 5004
(4 RCTs)
Follow up: 12 months
RR 0.86
(0.58 to 1.27) 2.2% 1.9%
(1.3 to 2.8) 0.3% fewer
(0.9 fewer to 0.6 more) ⨁⨁⨁⨁
High HD TRIPLE results in little to no difference in asthma‐related SAEs compared to HD‐ICS LABA.
Asthma‐related SAEs ‐ HD TRIPLE vs MD TRIPLE
№ of participants: 3472
(3 RCTs)
Follow up: 6 to 12 months
RR 0.57
(0.31 to 1.05) 1.7% 1.0%
(0.5 to 1.8) 0.7% fewer
(1.2 fewer to 0.1 more) ⨁⨁⨁⨁
High HD TRIPLE results in little to no difference in asthma‐related SAEs compared to MD TRIPLE.
Asthma‐related SAEs ‐ TRIPLE vs DUAL
№ of participants: 8192
(6 RCTs)
Follow up: 12 months
RR 1.04
(0.76 to 1.42) 1.8% 1.9%
(1.4 to 2.6) 0.1% more
(0.4 fewer to 0.8 more) ⨁⨁⨁⨁
Highb TRIPLE results in little to no difference in asthma‐related SAEs compared to DUAL.
All cause AEs ‐ HD‐ICS/LABA vs MD‐ICS LABA
№ of participants: 5949
(7 RCTs)
Follow up: 3 to 12 months
RR 1.01
(0.97 to 1.06) 43.8% 44.3%
(42.5 to 46.4) 0.4% more
(1.3 fewer to 2.6 more) ⨁⨁⨁⨁
High HD‐ICS/LABA results in little to no difference in all cause AEs compared to MD‐ICS LABA.
All cause AEs ‐ MD TRIPLE vs MD‐ICS/LABA
№ of participants: 3188
(3 RCTs)
Follow up: 12 months
RR 0.96
(0.91 to 1.00) 61.9% 59.4%
(56.3 to 61.9) 2.5% fewer
(5.6 fewer to 0 fewer) ⨁⨁⨁◯
Moderatec MD TRIPLE likely results in a slight reduction in all cause AEs compared to MD‐ICS/LABA.
All cause AEs ‐ HD TRIPLE vs MD‐ICS/LABA
№ of participants: 2039
(2 RCTs)
Follow up: 12 months
RR 0.92
(0.85 to 1.00) 52.0% 47.9%
(44.2 to 52) 4.2% fewer
(7.8 fewer to 0 fewer) ⨁⨁⨁◯
Moderatec HD TRIPLE likely results in a reduction in all cause AEs compared to MD‐ICS/LABA.
All cause AEs ‐ MD TRIPLE vs HD‐ICS/LABA
№ of participants: 2659
(2 RCTs)
Follow up: 12 months
RR 0.99
(0.83 to 1.18) 56.1% 55.5%
(46.5 to 66.2) 0.6% fewer
(9.5 fewer to 10.1 more) ⨁⨁◯◯
Lowa, b The evidence suggests that MD TRIPLE results in little to no difference in all cause AEs compared to HD‐ICS/LABA.
All cause AEs ‐ HD TRIPLE vs HD‐ICS/LABA
№ of participants: 5004
(4 RCTs)
Follow up: 12 months
RR 0.91
(0.87 to 0.96) 63.0% 57.3%
(54.8 to 60.5) 5.7% fewer
(8.2 fewer to 2.5 fewer) ⨁⨁⨁⨁
High HD TRIPLE results in a reduction in all cause AEs ‐compared to HD‐ICS/LABA.
All cause AEs ‐ HD TRIPLE vs MD TRIPLE
№ of participants: 3473
(3 RCTs)
Follow up: 6 to 12 months
RR 0.95
(0.90 to 1.02) 51.7% 49.1%
(46.5 to 52.7) 2.6% fewer
(5.2 fewer to 1 more) ⨁⨁⨁◯
Moderatec HD TRIPLE likely results in a slight reduction in all cause AEs ‐compared to MD TRIPLE.
All cause AEs ‐ TRIPLE vs DUAL
№ of participants: 8192
(6 RCTs)
Follow up: 12 months
RR 0.93
(0.90 to 0.96) 62.6% 58.2%
(56.3 to 60.1) 4.4% fewer
(6.3 fewer to 2.5 fewer) ⨁⨁⨁⨁
High TRIPLE results in a reduction in all cause AEs compared to DUAL.
Dropouts due to adverse event ‐ HD‐ICS/LABA vs MD‐ICS LABA
№ of participants: 5969
(7 RCTs)
Follow up: 3 to 12 months
RR 1.00
(0.68 to 1.48) 1.8% 1.8%
(1.2 to 2.7) 0.0% fewer
(0.6 fewer to 0.9 more) ⨁⨁⨁⨁
High HD ICS/LABA results in little to no difference in dropouts due to adverse event compared to MD‐ICS LABA.
Dropouts due to adverse event ‐ MD TRIPLE vs MD‐ICS/LABA
№ of participants: 3205
(3 RCTs)
Follow up: 12 months
RR 0.42
(0.08 to 2.14) 2.1% 0.9%
(0.2 to 4.4) 1.2% fewer
(1.9 fewer to 2.4 more) ⨁◯◯◯
Very lowb, d, e The evidence is very uncertain about the effect of MD TRIPLE on dropouts due to adverse event compared to MD‐ICS/LABA.
Dropouts due to adverse event ‐ HD TRIPLE vs MD‐ICS/LABA
№ of participants: 2670
(2 RCTs)
Follow up: 12 months
RR 0.47
(0.19 to 1.18) 2.9% 1.3%
(0.5 to 3.4) 1.5% fewer
(2.3 fewer to 0.5 more) ⨁⨁⨁◯
Moderatee HD TRIPLE likely results in a slight reduction in dropouts due to adverse event compared to MD‐ICS/LABA.
Dropouts due to adverse event ‐ MD TRIPLE vs HD‐ICS/LABA
№ of participants: 2668
(2 RCTs)
Follow up: 12 months
RR 1.24
(0.76 to 2.02) 2.4% 3.0%
(1.9 to 4.9) 0.6% more
(0.6 fewer to 2.5 more) ⨁⨁⨁◯
Moderatee MD TRIPLE likely results in little to no difference in dropouts due to adverse event compared to HD‐ICS/LABA.
Dropouts due to adverse event ‐ HD TRIPLE vs HD‐ICS/LABA
№ of participants: 5018
(4 RCTs)
Follow up: 12 months
RR 0.60
(0.38 to 0.95) 2.3% 1.4%
(0.9 to 2.2) 0.9% fewer
(1.4 fewer to 0.1 fewer) ⨁⨁⨁⨁
High HD TRIPLE results in a slight reduction in dropouts due to adverse event compared to HD‐ICS/LABA.
Dropouts due to adverse event ‐ HD TRIPLE vs MD TRIPLE
№ of participants: 1765
(2 RCTs)
Follow up: 6 to 12 months
RR 1.00
(0.29 to 3.44) 0.6% 0.6%
(0.2 to 2) 0.0% fewer
(0.4 fewer to 1.4 more) ⨁⨁⨁◯
Moderatee HD TRIPLE likely results in little to no difference in dropouts due to adverse event compared to MD TRIPLE.
Dropouts due to adverse event ‐ TRIPLE vs DUAL
№ of participants: 8223
(5 RCTs)
Follow up: 12 months
RR 0.59
(0.33 to 1.03) 2.2% 1.3%
(0.7 to 2.3) 0.9% fewer
(1.5 fewer to 0.1 more) ⨁⨁⨁◯
Moderatec TRIPLE likely results in a slight reduction in dropouts due to adverse event compared to DUAL.
*The risk in the intervention group (and its 95% confidence interval) is based on the assumed risk in the comparison group and the relative effect of the intervention (and its 95% CI).
GRADE Working Group grades of evidenceHigh certainty: we are very confident that the true effect lies close to that of the estimate of the effect.
Moderate certainty: we are moderately confident in the effect estimate: the true effect is likely to be close to the estimate of the effect, but there is a possibility that it is substantially different.
Low certainty: our confidence in the effect estimate is limited: the true effect may be substantially different from the estimate of the effect.
Very low certainty: we have very little confidence in the effect estimate: the true effect is likely to be substantially different from the estimate of effect.
Explanations
a. Confidence interval includes a clinically important difference.
b. Substantial heterogeneity I2 > 50% to 90%
c. Confidence interval includes the line of no effect.
d. Optimal information size is not met (Guyatt 2011b)
e. Very wide confidence interval.

AE: adverse event; CI: confidence interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta2 agonist; LD: low dose; MD: medium dose; RCT: randomised controlled trial; RR: risk ratio; SAE: serious adverse event.

Summary of findings 16. NMA Summary of Findings for asthma‐related SAEs.

Patient or population: Adolescent sand adults with symptomatic asthma
Interventions: HD‐ICS/LABA, MD‐TRIPLE, HD‐TRIPLE
Comparator (reference): Medium‐Dose ICS/LABA (MD‐ICS/LABA)
Outcome: Asthma‐related serious adverse events (SAEs)
Setting(s): Outpatient
Geometry of the Network in Figure 11*
Total studies: 11 RCTs
Total Participants: 13209
Relative risk**
(95% CrI)
Anticipated absolute effect***(95% CrI) Certainty of the evidence Ranking****
(95% CrI)
Interpretation of Findings
With intervention Difference compared to MD‐ICS/LABA
HD‐ICS/LABA
 
(Direct evidence; 6 RCTs; 6244 participants)
1.27
(0.79 to 2.05)
13 per 1000 3 per 1000 more
(from 2 fewer to 12 more)
⊕⊕⊕⊕
High
 
3.0
(1.0 to 4.0)
Little or no difference
MD‐TRIPLE
 
(Direct evidence; 3 RCTs; 3188 participants)
1.70
(0.99 to 1.8)
18 per 1000 8 per 1000 more
(from 0 fewer to 9 more)
⊕⊕⊕◯
Moderate
Due to imprecision1
4.0
(2.0 to 4.0)
Probably little or no difference
HD‐TRIPLE
 
(Direct evidence; 2 RCTs; 2039 participants)
1.05
(0.60 to 1.80)
11 per 1000 1 per 1000 more
(from 4 fewer to 9 more)
⊕⊕⊕⊕
High
2.0
(1.0 to 3.0)
Little or no difference
MD‐ICS/LABA Reference Comparator 10 per 10002 Reference Comparator Reference Comparator 1.0
(1.0 to 3.0)
Reference Comparator
NMA‐SoF table definitions
* The size of the nodes and the thickness of edges depend on the number of people randomised and the number of trials conducted, respectively.
** Network Meta‐Analysis estimates are reported as risk ratio. Results are expressed in credible intervals as opposed to the confidence intervals since a Bayesian analysis has been conducted.
*** Anticipated absolute effect. Anticipated absolute effect compares two risks by calculating the difference between the risk of the intervention group with the risk of the control group.
**** Median and credible intervals are presented. Rank statistics is defined as the probabilities that a treatment out of n treatments in a network meta‐analysis is the best, the second, the third and so on until the least effective treatment.
GRADE Working Group grades of evidence (or certainty in the evidence)
High certainty: We are very confident that the true effect lies close to that of the estimate of the effect
Moderate certainty: We are moderately confident in the effect estimate: The true effect is likely to be close to the estimate of the effect, but there is a possibility that it is substantially different
Low certainty: Our confidence in the effect estimate is limited: The true effect may be substantially different from the estimate of the effect
Very low certainty: We have very little confidence in the effect estimate: The true effect is likely to be substantially different from the estimate of effect
Explanatory Footnotes
1 Serious imprecision due to wide confidence intervals in the direct and/or indirect estimate(s).
2 Based on the average rate in participants treated with MD‐ICS/LABA in the included studies.

CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta2 agonist; MD: medium dose; NMA: network meta‐analysis; RCT: randomised controlled trial; SAE: serious adverse event.

11.

11

Network diagram for asthma‐related SAEs for grouped interventions

The size of the nodes and the thickness of edges depend on the number of people randomised and the number of trials conducted. HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

Summary of findings 17. NMA Summary of Findings for all‐cause AEs.

Patient or population: Adolescents and adults with symptomatic asthma
Interventions: HD‐ICS/LABA, MD‐TRIPLE, HD‐TRIPLE
Comparator (reference): Medium‐Dose ICS/LABA (MD‐ICS/LABA)
Outcome: All‐cause adverse events (AEs)
Setting(s): Outpatient
Geometry of the Network in Figure 12*
Total studies: 12 RCTs
Total Participants: 12915
Relative effect**
(95% CrI)
Anticipated absolute effect***(95% CrI) Certainty of the evidence Ranking****
(95% CrI)
Interpretation of Findings
With intervention Difference compared to MD‐ICS/LABA
HD‐ICS/LABA
 
(Direct evidence; 7 RCTs; 5949 participants)
1.00
(0.89 to 1.12)
508 per 1000 0 per 1000 more
(from 29 fewer to 28 more)
⊕⊕⊕⊕
High
3.0
(2.0 to 4.0)
Little or no difference
MD‐TRIPLE
 
(Direct evidence; 3 RCTs; 3188 participants)
0.89
(0.78 to 1.02)
479 per 1000 29 per 1000 fewer
(from 62 fewer to 5 more)
⊕⊕⊕◯
Moderate
Due to imprecision1
2.0
(1.0 to 3.0)
Probably little or no difference
HD‐TRIPLE
 
(Direct evidence; 2 RCTs; 2039 participants)
0.79
(0.69 to 0.90)
449 per 1000 59 per 1000 fewer
(from 26 fewer to 92 fewer)
⊕⊕⊕⊕
High
1.0
(1.0 to 2.0)
Superior
MD‐ICS/LABA Reference Comparator 508 per 10002 Reference Comparator Reference Comparator 3.0
(2.0 to 4.0)
Reference Comparator
NMA‐SoF table definitions
* The size of the nodes and the thickness of edges depend on the number of people randomised and the number of trials conducted, respectively.
** Network Meta‐Analysis estimates are reported as risk ratio. Results are expressed in credible intervals as opposed to the confidence intervals since a Bayesian analysis has been conducted.
*** Anticipated absolute effect. Anticipated absolute effect compares two rates by calculating the difference between the rates of the intervention group with the rate of MD‐ICS/LABA group.
**** Median and credible intervals are presented. Rank statistics is defined as the probabilities that a treatment out of n treatments in a network meta‐analysis is the best, the second, the third and so on until the least effective treatment.
GRADE Working Group grades of evidence (or certainty in the evidence)
High certainty: We are very confident that the true effect lies close to that of the estimate of the effect
Moderate certainty: We are moderately confident in the effect estimate: The true effect is likely to be close to the estimate of the effect, but there is a possibility that it is substantially different
Low certainty: Our confidence in the effect estimate is limited: The true effect may be substantially different from the estimate of the effect
Very low certainty: We have very little confidence in the effect estimate: The true effect is likely to be substantially different from the estimate of effect
Explanatory Footnotes
1 Serious imprecision due to 95% CIs including the null effect.
2 Based on the average rate in participants treated with MD‐ICS/LABA in the included studies.

AE: adverse event; CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta2 agonist; MD: medium dose; NMA: network meta‐analysis; RCT: randomised controlled trial.

12.

12

Network diagram for all‐cause AEs for grouped interventions.

Node colors denote the treatment group. The size of the nodes and the thickness of edges depend on the number of people randomised and the number of trials conducted. HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

Summary of findings 18. NMA summary of findings table for dropouts due to AEs.

‐Patient or population: Adolescents and adults with symptomatic asthma
Interventions: HD‐ICS/LABA, MD‐TRIPLE, HD‐TRIPLE
Comparator (reference): Medium‐Dose ICS/LABA (MD‐ICS/LABA)
Outcome: Dropouts due to adverse events (AEs)
Setting(s): Outpatient
Geometry of the Network in Figure 13*
Total studies: 12 RCTs
Total Participants: 12915
Risk ratio**
(95% CrI)
Anticipated absolute effect***(95% CrI) Certainty of the evidence Ranking****
(95% CrI)
Interpretation of Findings
With intervention Difference compared to MD‐ICS/LABA
HD‐ICS/LABA
 
(Direct evidence; 7 RCTs; 5969 participants)
0.91
(0.64 to 1.36)
15 per 1000 1 per 1000 fewer
(from 6 fewer to 5 more)
⊕⊕⊕⊕
High
3.0
(2.0 to 4.0)
Little or no difference
MD‐TRIPLE
 
(Direct evidence; 3 RCTs; 3205 participants)
0.88
(0.53 to 1.43)
14 per 1000 2 per 1000 fewer
(from 8 fewer to 7 more)
⊕⊕⊕◯
Moderate
Due to imprecision1
3.0
(2.0 to 4.0)
Probably little or no difference
HD‐TRIPLE
 
(Direct evidence; 2 RCTs; 2051 participants)
0.50
(0.30 to 0.84)
8 per 1000 8 per 1000 fewer
(from 11 fewer to 3 fewer)
⊕⊕⊕◯
Moderate
Due to imprecision1
1.0
(1.0 to 2.0)
Probably superior
MD‐ICS/LABA Reference Comparator 16 per 10002 Reference Comparator Reference Comparator 4.0
(2.0 to 4.0)
Reference Comparator
NMA‐SoF table definitions
* The size of the nodes and the thickness of edges depend on the number of people randomised and the number of trials conducted, respectively.
** Network Meta‐Analysis estimates are reported as risk ratio. Results are expressed in credible intervals as opposed to the confidence intervals since a Bayesian analysis has been conducted.
*** Anticipated absolute effect. Anticipated absolute effect compares two rates by calculating the difference between the rates of the intervention group with the rate of MD‐ICS/LABA group.
**** Median and credible intervals are presented. Rank statistics is defined as the probabilities that a treatment out of n treatments in a network meta‐analysis is the best, the second, the third and so on until the least effective treatment.
GRADE Working Group grades of evidence (or certainty in the evidence)
High certainty: We are very confident that the true effect lies close to that of the estimate of the effect
Moderate certainty: We are moderately confident in the effect estimate: The true effect is likely to be close to the estimate of the effect, but there is a possibility that it is substantially different
Low certainty: Our confidence in the effect estimate is limited: The true effect may be substantially different from the estimate of the effect
Very low certainty: We have very little confidence in the effect estimate: The true effect is likely to be substantially different from the estimate of effect
Explanatory Footnotes
1 Serious imprecision due to wide confidence intervals in the direct and/or indirect estimate(s).
2 Based on the average rate in participants treated with MD‐ICS/LABA in the included studies.

AE: adverse event; CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose; NMA: network meta‐analysis; RCT: randomised controlled trial.

13.

13

Network diagram for drop‐outs due to AEs for grouped interventions.

The size of the nodes and the thickness of edges depend on the number of people randomised and the number of trials conducted. HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

Background

Description of the condition

Asthma is a chronic inflammatory airway disease characterised by reversible airway obstruction. The disease often starts in childhood, although it can be first diagnosed during adulthood. It is characterised by symptoms such as wheezing, shortness of breath, coughing and chest tightness. These symptoms are usually reversible with bronchodilator therapy and inhaled corticosteroids (ICS). Asthma is a common condition with global prevalence rates ranging from 7% to 25% (Sears 2014). It affects as many as 339 million people with estimated annual deaths of 420,000 worldwide (Global Asthma Report 2018). It also has significant economic impacts and accounts for 1.1% of global disability‐adjusted life years (Soriano 2017). The main objectives in asthma management are to achieve symptom control, reduce exacerbations, and meet patient and family expectations (GINA 2021).

Description of the intervention

Management of asthma involves a series of stepwise therapies depending on the severity of the disease. Initial therapy typically starts with a short‐acting beta2‐agonist as needed (step 1), and a daily low‐dose (LD) ICS is added for persistent symptoms (step 2) (O'Byrne 2019). Subsequently, a long‐acting beta2‐agonist (LABA), such as formoterol, typically is added to LD‐ to medium‐dose (MD) ICS if needed (steps 3 and 4) (Ducharme 2010; Sobieraj 2018a). Current guidelines recommend adding a long‐acting muscarinic antagonist (LAMA) or a biologic agent and/or consideration of high dose ICS‐LABA (step 5), when asthma is not controlled with MD‐ICS/LABA combination therapy (GINA 2021).

How the intervention might work

Inhaled corticosteroids work by their anti‐inflammatory effects in reducing bronchial hyper‐responsiveness and mucus hypersecretion (Barnes 2010). They are currently the first‐line therapeutic agents in the management of persistent asthma.

The LABA class of medications works by stimulation of the beta2 receptors on smooth muscles of the airways, which results in prolonged bronchodilation and a membrane stabilisation effect (Derom 1992Kips 2001). LABA therapy plays a role in the treatment of asthma. However, it has long been established that LABA should play an adjunctive role with ICS as LABA was found to be inferior to ICS in the management of asthma when used as monotherapy (Haahtela 1991). Therefore, in the management of asthma, LABA medications are not utilised until failure with ICS monotherapy has been identified.

Long‐acting muscarinic antagonists (LAMAs) inhibit the action of acetylcholine at muscarinic receptors in bronchial smooth muscle and submucosal glands, resulting in bronchodilation as well as decreased mucus production (Gosens 2018). Their side effects are related to anticholinergic effects and typically comprise dry mouth, urinary retention and mydriasis (dilated pupils) (McIvor 2014). These side effects can impact participants’ adherence and potentially affect outcomes. Recent evidence has suggested a role for LAMAs in the treatment of persistent asthma not controlled with ICS/LABA (Aalbers 2017Kerstjens 2012). The premise of the addition of LAMA is to synergistically increase bronchodilation and thus alleviate asthma symptoms.

Why it is important to do this review

A recent meta‐analysis by Sobieraj and colleagues demonstrated that addition of a LAMA to ICS compared to ICS alone reduced asthma exacerbations (Sobieraj 2018a). Other studies also support the benefit of LAMA when added to ICS (Anderson 2015Befekadu 2014). However, ICS/LABA/LAMA or ICS/LAMA combinations failed to show any benefit compared to ICS/LABA (Sobieraj 2018b). This review involved a network meta‐analysis assessing outcomes in people with asthma whose symptoms are not well‐controlled with an ICS/LABA combination by comparing higher dose ICS/LABA and triple therapy (ICS/LABA/LAMA). If a triple combination (ICS/LABA/LAMA) is no more effective than a medium dose (MD) or high‐dose (HD) ICS/LABA combination, healthcare providers could consider other options such as a biologic agent (step 6) when an MD‐ or HD‐ICS/LABA combination fails.

There is a question of whether there are added benefits of HD versus MD ICS and a concern for increased side effects with higher‐dose ICS (Beasley 2019Kew 2016Zhang 2019). Inhaled corticosteroids are associated with systemic adverse events driven by increased dosages. These include osteoporosis, cataracts, skin changes (thinning and bruising) and adrenal suppression (Pandya 2014). Most studies comparing dual and triple combination therapies did not consider ICS doses (i.e. low‐, medium‐ and high‐doses) in their combinations. Therefore, this review also analysed the impact of HD versus MD ICS within the dual and triple combination therapies. If this review confirms the notion that an HD ICS increases side effects with no additional benefits compared with an MD ICS in combination inhalers, healthcare providers could be discouraged from using an HD ICS in combination inhalers.

Objectives

To assess the effectiveness and safety of dual and triple combination inhaler therapies, using a network‐meta‐analysis (NMA), compared with each other and with varying doses of inhaled corticosteroids (ICS) in adolescents and adults with uncontrolled asthma who have been treated with or are eligible for medium dose (MD)‐ ICS/long‐acting beta2‐agonist (LABA) combination therapy.

Methods

Criteria for considering studies for this review

Types of studies

We included pre‐registered randomised controlled trials (RCTs) of at least 12 weeks of study duration. To minimise publication bias and selective reporting, studies could be either published or unpublished. We did not consider cluster or‐ cross‐over RCTs to minimise unit of analysis errors, overestimating the treatment effects, and residual effects of crossed over inhaled corticosteroids (ICS) doses.

Types of participants

We included studies in adolescents and adults (age 12 years or older) with uncontrolled asthma who had been treated with or were eligible for MD‐ICS/LABA combination therapy. In this review, uncontrolled asthma is defined as: Asthma Control Questionnaire (ACQ) score equal to or greater than 1.5 (Juniper 2006); Asthma Control Test (ACT) score less than 20 (Schatz 2006); persistent asthma (symptoms or rescue medication usage two days per week or nighttime awakenings three times per month); or at least one asthma exacerbation in the past 12 months prior to randomisation (Gessner 2020Kerstjens 2012Papi 2007).

Types of interventions

We included studies comparing at least two of the following therapies.

  • MD‐ or HD‐ICS/LABA, a fixed dose (a combination of two active ingredients in a fixed ratio of doses) or free combination of two separate inhalers (beclomethasone/formoterol, budesonide/formoterol, ciclesonide/formoterol, fluticasone/formoterol, mometasone/formoterol, mometasone/indacaterol, fluticasone/salmeterol, fluticasone/vilanterol, etc.)

  • ICS/LABA/LAMA, a fixed‐dose (a combination of three active ingredients in a fixed ratio of doses) triple combination (fluticasone furoate/vilanterol/umeclidinium, mometasone/glycopyrronium/indacaterol (MF/GLY/IND), etc.), or an ICS/LABA fixed combination plus a LAMA (aclidinium, glycopyrronium, tiotropium, umeclidinium, etc.)

We classified doses of the ICS component in combination inhalers into low, medium, or high dose based on clinical comparability (BTS/SIGN 2019; GINA 2021). We considered fluticasone furoate 100 μg once daily a medium dose which was approximately equivalent to fluticasone propionate 250 μg twice daily according to the manufacturer's summary of product characteristics (Bernstein 2018; NICE 2018). We had originally classified MF/GLY/IND 160/50/150 µg and 80/50/150 µg as MD and LD Triple according to Vaidya 2016 which was later reclassified as HD and MD triple when new data became available (Buhl 2021).

We allowed the use of a short‐acting bronchodilator, such as albuterol (salbutamol) and ipratropium as rescue treatment. Network diagrams of individual treatment and grouped comparisons in each outcome for the NMAs are presented in the Figures section.

Types of outcome measures

We analysed the following outcomes in this review.

Primary outcomes
  1. Asthma exacerbations (moderate, defined as requiring a short course of oral corticosteroids and severe, defined as resulting in hospitalisation, mechanical ventilation, or death)

Secondary outcomes
  1. Asthma Control Questionnaire (ACQ‐7: seven item question) and its responders (Juniper 2006)

  2. Asthma Quality of Life Questionnaire (AQLQ) (Juniper 1994)

  3. All‐cause adverse events (AEs) and serious adverse events (SAEs)

  4. Asthma‐related SAEs

  5. Dropouts due to AEs

An SAE is defined by the US Food and Drug Administration (FDA) as any untoward medical occurrence that at any dose: results in death; is life‐threatening; requires inpatient hospitalisation or causes prolongation of existing hospitalisation; results in persistent or significant disability or incapacity; may have caused a congenital anomaly or birth defect; or requires intervention to prevent permanent impairment or damage (FDA 2016).

Search methods for identification of studies

Electronic searches

We identified studies from searches of the following databases and trial registries.

  1. Cochrane Airways Trials Register (Cochrane Airways 2019), via the Cochrane Register of Studies, 2008 to 18 February 2022.

  2. Cochrane Central Register of Controlled Trials (CENTRAL), via the Cochrane Register of Studies, 2008 to 18 February 2022

  3. MEDLINE Ovid SP 2008 to18 February 2022

  4. Embase Ovid SP 2008 to 18 February 2022

  5. Global Health Ovid SP 2008 to 18 February 2022

  6. US National Institutes of Health Ongoing Trials Register ClinicalTrials.gov (www.clinicaltrials.gov)

  7. World Health Organisation International Clinical Trials Registry Platform (apps.who.int/trialsearch)

The database search strategies are listed in Appendix 1. The original search strategy was drafted in MEDLINE and adapted for use in the other databases. We structured the search strategy to search for articles containing terms for asthma, a LABA and an ICS. This structure facilitated searching for all the possible comparisons. The Cochrane Airways Information Specialist developed the search strategy in collaboration with the authors.

We searched all databases and trials registries from 2008, when the International Committee of Medical Journal Editors started to implement an updated policy requiring trial registration as a condition of publication, to 18 February 2022. There was no restriction on language or type of publication. We identified conference abstracts and grey literature to be hand searched through the Cochrane Airways Trials Register and the CENTRAL database.

Searching other resources

We checked the reference lists of all primary studies and review articles for additional references. We searched relevant manufacturers' websites for study information. We searched on PubMed for errata or retractions from included studies published in full text. We contacted investigators or study sponsors in order to obtain missing numerical outcome data as necessary.

Data collection and analysis

Selection of studies

We used Cochrane’s Screen4Me workflow to help assess the search results. Screen4Me comprises three components: known assessments – a service that matches records in the search results to records that have already been screened in Cochrane Crowd and been labelled as an RCT or as Not an RCT; the RCT classifier – a machine learning model that distinguishes RCTs from non‐RCTs; and if appropriate, Cochrane Crowd (http://crowd.cochrane.org) – Cochrane’s citizen science platform where the Crowd help to identify and describe health evidence. More detailed information about the Screen4Me components can be found in these publications: Marshall 2018; McDonald 2017; Noel‐Storr 2018; Thomas 2017.

Following this initial assessment, two review authors (YO, TM) independently screened titles and abstracts of the search results using Covidence and coded them as 'retrieve' (eligible or potentially eligible or unclear) or 'do not retrieve'. We retrieved the full‐text study reports of all potentially eligible studies and two review authors (YO, TM) independently screened them for inclusion, recording the reasons for exclusion of ineligible studies. We resolved any disagreement through discussion or, if required, we consulted a third review author (TP). We identified and excluded duplicates and collated multiple reports of the same study so that each study, rather than each report, was the unit of interest in the review. We recorded the selection process in sufficient detail to complete a PRISMA flow diagram and 'Characteristics of excluded studies' table (Moher 2009).

Data extraction and management

We used a data collection form for study characteristics and outcome data, which had been piloted on at least one study in the review. Three review authors (YO, TM, TP) extracted the following study characteristics from the included studies.

  1. Methods: study design, total duration of study, details of any 'run‐in' period, study centres and location, study setting, withdrawals, and date of study.

  2. Participants: number, mean age, age range, gender, race, smoking history, exacerbation history, diagnostic criteria, baseline lung function, and inclusion and exclusion criteria.

  3. Interventions: intervention, comparison, concomitant medications, and excluded medications.

  4. Outcomes: primary and secondary outcomes specified and collected, and time points reported. We used change from baseline (CFB) data, i.e., the difference between baseline and post‐intervention values at 3, 6, and 12 months.

  5. Notes: funding for studies, website address for industry generated reports (e.g., Clinical Study Report), and trial registration number.

Two review authors (YO, TM) independently extracted outcome data from the included studies. We chose estimated effects of intervention in the following order of preference: (1) full intention‐to‐treat analysis (ITT); (2) modified ITT; (3) per‐protocol analysis. We noted in the 'Characteristics of included studies' table if outcome data were not reported in a usable way. We resolved disagreements by consensus or by involving a third review author (TP). One review author (YO) transferred data into the Review Manager file (Review Manager 2020). We double‐checked that data were entered correctly by comparing the data presented in the systematic review with the study reports. A second review author (TM) spot‐checked study characteristics for accuracy.

Assessment of risk of bias in included studies

Two review authors (YO, TM) independently assessed risk of bias for each study using the criteria outlined in the revised Cochrane risk of bias 2 (RoB 2) tool (Higgins 2019Sterne 2019). We used the RoB 2 Excel tool to implement RoB 2 and presented consensus decisions for signalling questions in a general repository as supplemental data to be transparent. We assessed the risk of bias according to the following domains in all outcome measures and time points as necessary.

  1. Randomisation processes

  2. Deviations from intended interventions

  3. Missing outcome data

  4. Measurement of outcome

  5. Selective outcome reporting

We categorised each domain as being 'high risk', 'low risk' or 'some concerns' using the algorithms proposed in RoB 2. We assessed overall risk of bias and considered a study: to be at high risk of bias when at least one domain was judged as being at high risk; to be at low risk when all domains were judged as being at low risk (Guyatt 2011a), and to raise some concerns when at least one domain was judged to raise some concerns but no domains were judged as being at high risk of bias. We resolved any disagreement through discussion or, if required, we consulted a third review author (TP).

Assessment of bias in conducting the systematic review

We conducted this review according to the previously published protocol (Oba 2020) and justified any deviations from it in the 'Differences between protocol and review' section of this review. We used the overall risk of bias judgements in the GRADE approach and summary of finding tables (Guyatt 2011b).

Network meta‐analysis

We compared each pair of treatments by estimating a hazard ratio (HR) for time‐to‐event outcomes (e.g. asthma exacerbations), a mean difference for continuous outcomes, and an odds ratio (OR) for dichotomous outcomes, along with their 95% credible intervals (CrIs).

We used a shared parameter model for exacerbation outcomes, whereby data on the log hazard ratio (lnHR) were modelled with the assumption that continuous treatment differences (lnHR and standard error)(SE) had a normal likelihood. When lnHR data were not available, or when appropriate covariance matrices could not be extracted or calculated for studies with more than two arms, we modelled data on dichotomous data at a given time as lnHR by using a binomial likelihood with a cloglog link. We used HR data in preference to dichotomous data when available and considered only the HR for the first event for exacerbation outcomes. When there were no dichotomous data available for a multi‐arm study for which a covariance matrix could not be calculated, we included unconnected pairwise comparisons as separate studies.

We used a normal likelihood with an identity link for continuous outcomes and a binomial likelihood with a logit link for dichotomous outcomes.

Direct pairwise meta‐analysis

We analysed dichotomous data as risk ratio (RR) or risk difference (RD) and continuous data as the mean difference(MD) along with their 95% confidence intervals (CIs).

Unit of analysis issues

For dichotomous outcomes, we used participants, rather than events, as the unit of analysis (i.e. number of participants admitted to hospital, rather than number of admissions).

Dealing with missing data

We contacted investigators or study sponsors in order to obtain missing numerical outcome data where possible (e.g. when a study was identified as an abstract only). When this was not possible and a large proportion of data was missing, we considered the missing data would introduce serious bias using the criteria proposed by Guyatt 2017. We took this into consideration in the GRADE rating for the affected outcomes.

Network meta‐analysis

We assessed heterogeneity by comparing the between‐trials standard deviation (SD) to the size of relative treatment effects, on the log‐scale for HRs and ORs. We assessed consistency between direct and indirect estimates by fitting node splitting models (van Valkenhoef 2016) and inspecting the resulting Bayesian p‐values for inconsistency, as well as comparing the model fit and between‐study heterogeneity to the standard NMA model. We extracted potential effect modifiers such as age, gender, race, smoking status, and exacerbation history. We assessed clinical heterogeneity by comparing them across different treatment comparisons. We qualitatively compared direct estimates from pairwise meta‐analysis with NMA estimates to check for broad agreement.

Direct pairwise meta‐analysis

We used the I2 statistic to measure heterogeneity amongst the studies in each analysis with I2 greater than 50% suggesting substantial heterogeneity (Deeks 2020). We also visually inspected forest plots and assess p values from the Chi2 test to identify heterogeneity. We reported substantial heterogeneity when identified and rated down the certainty of evidence when appropriate (Guyatt 2011a).

Network meta‐analysis

We minimised reporting bias from unpublished studies or selective outcome reporting by using a broad search strategy and by checking references of included studies and relevant systematic reviews. For each outcome, we estimated and presented the proportion of studies contributing data to the NMAs.

Direct pairwise meta‐analysis

For pairwise meta‐analyses, we assessed small‐study and publication bias through visual inspection of a funnel plot if more than 10 studies were being pooled. We assumed the presence of small‐study bias when the number of participants was fewer than 50 per study, 1000 per pooled analysis, or 100 per arm when no more than 10 studies could be pooled (Dechartres 2013Nüesch 2010).

Network meta‐analysis (NMA) 

We conducted NMAs in OpenBUGS (version 3.2.3) and sampled 100,000 iterations for three chains after a burn‐in of 50,000 iterations for exacerbations outcomes. NMAs for moderate‐severe exacerbations were conducted in R (version 4.0.5) using the GeMTC package, as there were only dichotomous data for the outcome. Models were sampled over 100,000 iterations forfour4 chains, after a burn‐in of 50,000 iterations. We used half‐normal prior distributions (Röver 2021) for the between‐study heterogeneity in severe exacerbations.

For continuous outcomes, we sampled over 100,000 iterations for four chains, after a burn‐in of 50,000 iterations using R (version 4.0.5) with GeMTC package. We analysed group comparisons only as there were sufficient data to allow for individual treatment comparisons.

For dichotomous outcomes, we mostly conducted NMAs in R (version 4.0.5) using GeMTC package, but exceptions were made for individual treatment outcomes that reported zero counts for events (asthma‐related SAEs and dropouts due to AEs). As the data for individual treatments were sparse, we added a continuity correction of 0.5 to make the models stable and ensure convergence when necessary. GeMTC does not allow a continuity correction to be added, so we fit these models in OpenBUGS. We sampled 100,000 iterations for four chains after a burn‐in of 50,000 iterations for models in GeMTC and 100,000 iterations for three chains after a burn‐in of 50,000 iterations for models in OpenBUGS. We used prior distributions for the comparison of pharmacological interventions for between‐study heterogeneity as suggested by Turner and colleagues. (Turner 2015).

We included all eligible studies in the primary analysis as long as a trial was connected to the main network. We based model comparison on the Deviance Information Criterion (DIC) (Spiegelhalter 2002). Differences of three points or more were considered meaningful. If models differed by less than three points, we selected the simplest model. We also calculated the posterior mean of the residual deviance to assess model fit. We considered this adequate when the posterior mean of the residual deviance approximated the number of unconstrained data points (Dias 2013a).

We estimated the probability that each treatment group ranked at one of the five possible positions in the grouped comparisons and presented mean and median ranks along with their 95% CrIs for all the primary and secondary outcomes with rank one, meaning that group was best for that outcome. We presented specific methodological details for each analysis in the result sections.

Direct pairwise meta‐analysis

We performed direct pairwise meta‐analyses using a fixed‐effect or random‐effects model in case of significant heterogeneity (I2 greater than 50%) using Review Manager 5.4 (Review Manager 2020). We undertook a pairwise meta‐analysis only where this was meaningful; that is, if the treatments, participants, and the underlying clinical question were similar enough for pooling to make sense.

Subgroup analysis and investigation of heterogeneity

We classified doses of the ICS component in combination inhalers into medium and high dose and the results were reported individually as well as combining MD‐ and HD‐ICS formulations of each combination therapy (i.e., dual versus triple therapy). We performed a subgroup analysis for exacerbation outcomes separating studies which required a history exacerbation in the previous year vs. those that did not to assess clinical heterogeneity (intransitivity) in the NMAs.

Sensitivity analysis

We performed sensitivity analyses for all the primary and secondary outcomes excluding studies at high risk of bias from the overall analysis and analysed studies of different duration separately for continuous outcomes and ACQ responders. We identified studies at high risk of bias using RoB 2 as described above. We used a model not used in the primary analysis (fixed‐effect or random‐effects) as a sensitivity analysis for all pairwise meta‐analyses and some outcomes in the NMA depending on the model fit.

Threshold analysis

We conducted threshold analyses at the contrast level for the exacerbation outcomes as part of a sensitivity analysis (Phillippo 2018; Phillippo 2019) to examine the impact of potential bias on each treatment contrast of the group comparisons. We did not conduct a threshold analysis for individual treatment comparisons as there was too much uncertainty in the estimates.

Summary of findings and assessment of the certainty of the evidence

We created summary of findings tables using the outcomes listed under Types of outcome measures. We used the five GRADE considerations (risk of bias, consistency of effect, imprecision, indirectness and publication bias) to assess the certainty of a body of evidence as it related to the studies that contributed data for the prespecified outcomes (Guyatt 2011b). We used the methods and recommendations described in Chapter 14 of the Cochrane Handbook for Systematic Reviews of Interventions (Schünemann 2020), using GRADEpro software (GRADEpro GDT). We estimated anticipated absolute effects from each reference comparator (active control) in the included studies. We justified all decisions to downgrade the certainty of evidence using footnotes, and we made comments to aid the reader's understanding of the review where necessary. We presented NMA‐summary of findings tables, proposed by Yepes‐Nuñez and colleagues, for all outcomes in the NMA (Yepes‐Nuñez 2019). It consisted of details of questions and interventions for a specific outcome, relative effect estimates for each intervention, anticipated absolute effects, GRADE certainty of evidence, rank probabilities of the intervention, and interpretations of findings.

Results

Description of studies

Results of the search

Database searching identified 5974 records, after we removed duplicates 3061records remained. The search was conducted up to 18 February 2022. 541 records were excluded by Crowd Known Assessments, and Classifier. We excluded 2402 studies on abstract review. We reviewed the remaining 118 studies for further details and excluded additional 101 studies for various reasons as shown in Figure 14.

14.

14

PRISMA flow diagram

Included studies

We included 17 studies (19 trials) with a total of 17,161 participants. The study and patient characteristics including study durations, treatment arms, demographics of participants, and baseline pulmonary function are presented in Table 19 and details of each study are shown in Characteristics of included studies. The median duration of trials was 26 weeks (range 12 to 52). A history of at least one asthma exacerbation within the past year was required in five studies (Gessner 2020Kerstjens 2012Kerstjens 2020Stempel 2016Virchow 2019). Five studies only included an intra group comparison of MD‐ICS/LABAs (Bernstein 2011Bodzenta‐Lukaszyk 2012Cukier 2013Papi 2007Woodcock 2013). The number of included studies varied with each outcome due to data availability which is summarised in summary of findings tables. All studies were industry funded and conducted in multiple centres.

1. Study characteristics of included trials.
Study, year Arms included
Dose in micrograms
Duration (weeks) No. of participants included Mean age Male (%) White (%) Current smoker excluded/ maximum PYs allowed for ex‐smokers Baseline FEV1 (L) prebronchodilator (% predicted) History of at least one asthma exacerbation
Bernstein 2011 MF/FM 200/10 bid 12 371 44.8 87 87 Y/10 2.3 (74) Not required
FP/SAL 250/50 bid 351 45.1 86 86 2.4 (74)
Bernstein 2015 FF/VI 100/25 qd 12 346 44.7 41 89 Y/10 2.0 (63) Not required
FF/VI 200/25 qd 346 45.9 35 87 2.0 (62)
Bodzenta‐Lukaszyk 2012 FP/FM 250/10 bid 12 140 49.8 37 96 Y/10 NR (65) Not required
BUD/FM 400/12 bid 139 48.1 27 96 NR (64)
Busse 2008 BUD/FM 320/9 bid 24 427 39.4 34 82 N/20 2.5 (79) Not required
FP/SAL 250/50 bid 406 38.8 43 84 2.6 (78)
Cukier 2013 FP/FM 250/12 bid 12 97 34.5 24 67 Y/10 2.5 (86) Not required
BUD/FM 400/12 bid 99 35.6 27 72 2.5 (85)
Gessner 2020 MF/GLY/IND 80/50/150 qd 24 474 51.9 35 85 N/20 NR (63) Required
MF/GLY/IND 160/50/150 qd 476 52.7 39 82 NR (62)
FP/SAL 500/50 bid + Tio 5 qd 476 53.1 36 82 NR(63)
Kerstjens 2012a HD‐ICS/LABA 48 237 52.9 38 84 Y/10 1.6 (55) Required
HD‐ICS/LABA+Tio 5 qd 222 53.9 36 84 1.6 (55)
Kerstjens 2012b HD‐ICS/LABA 48 219 51.4 42 80 Y/10 1.7 (55) Required
HD‐ICS/LABA+Tio 5 qd 234 53.6 42 84 1.6 (55)
Kerstjens 2020 MF/GLY/IND 80/50/150 qd 52 620 52.4 42 74 Y/10 1.6 (54) Required
MF/GLY/IND 160/50/150 qd 619 52.1 38 74 1.6 (55)
MF/IND 160/150 qd 617 51.8 39 73 1.6 (55)
MF/IND 320/150 qd 618 52.0 39 73 1.6 (54)
FP/SAL 500/50 bid 618 52.9 33 76 1.6 (55)
Lee 2020 FF/VI 100/25 qd 24‐52 407 53.3 38 80 Y/10 1.7 (58) Not required
FF/UMEC/VI 100/62.5/25 qd 406 52.9 39 83 1.8 (59)
FF/VI 200/25 qd 406 53.9 38 78 1.7 (59)
FF/UMEC/VI 200/62.5/25 qd 408 53.7 37 80 1.7 (59)
Mansfield 2017 FP/SAL 250/50 bid 26 41 45.9 51 78 Y/10 2.4 (NR) Not required
FP/SAL 200/12.5 bid 133 46.1 46 71 2.3 (NR)
FP/SAL 500/50 bid 44 45.6 48 70 2.5 (NR)
Papi 2007 BDP/FM 200/12 bid 12 115 47.3 45 NR Y/10 2.1 (68) Not required
FP/SAL 250/50 bid 113 49.7 43 2.0 (67)
Peters 2008 BUD/FM 640/18 bid 52 443 41.0 37 87 Y/20 2.4 (75) Not required
BUD/FM 320/9 bid 132 38.6 41 89 2.4 (72)
Stempel 2016 FP/SAL 250/50 bid 26 580 43.4 34 75 Y/10 NR (PEF>=50%) Required
FP/SAL 500/50 bid 982 43.4 34 75
van Zyl‐Smit 2020 MF/IND 320/150 qd 26‐52 445 47.1 41 70 Y/10 2.1 (67) Not required
MF/IND 160/150 qd 439 47.4 42 71 2.1 (67)
FP/SAL 500/50 bid 446 48.9 43 68 2.1 (67)
Virchow 2019a BDP/FM/G 200/12/20 bid 26‐52 576 52.6 38 100 Y/10 1.7 (55) Required
BDP/FM 200/12 bid 574 52.5 39 100 1.7 (56)
Virchow 2019b BDP/FM/GLY 400/12/20 bid 26‐52 571 53.1 37 100 Y/10 1.6 (52) Required
BDP/FM 400/12 bid 573 54.0 43 100 1.6 (52)
BDP/FM 400/12 bid +Tio 5 qd 287 51.6 36 100 1.6 (52)
Weinstein 2010 MF/FM 200/10 bid 12 233 48.4 42 90 Y/10 2.1 (67) Not required
MF/FM 400/10 bid 255 47.7 46 89 2.0 (66)
Woodcock 2013 FF/VI 100/25 qd 24 403 43.8 39 60 Y/10 2.0 (68) Not required
FP/SAL 250/50 bid 403 41.9 39 58 2.0 (69)

Abbreviations: bid= twice daily; BDP= beclomethasone dipropionate; BUD=budesonide; FEV1= forced expiratory volume in 1 second; FF=fluticasone furoate; FM=formoterol; FP=fluticasone propionate; GLY= glycopyrronium; IND=indacaterol; MF=mometasone furoate; NR= not reported; PEF=peak flow; PY= pack‐year; qd=once daily; SAL=salmeterol; Tio=tiotropium; UMEC= umeclidinium; VI=vilanterol.

Participants

The mean age and proportion of male and white participants were 49.1 (standard deviation (SD) 15.0) years, 40 %, and 81 %, respectively. Current smokers were excluded in all studies. Previous smokers who had smoked 20 pack‐years or greater were excluded in two studies (Busse 2008 and Gessner 2020) and those who had smoked 10 pack‐years or greater were excluded in the rest. The mean forced expiratory volume in 1 second (FEV1) and FEV1 % predicted at the baseline were reported in 14 and 15 studies and 1.9 L and 61%, respectively.

Excluded studies

We excluded 94 studies after full‐text review (Figure 14) which are recorded in Characteristics of excluded studies, with reasons for exclusion. We excluded Kerwin 2021 because ICS doses were not reported and glycopyrronium formulations used in the trial were not approved for clinical use or commercially available at the time of data extraction.

Risk of bias in included studies

Assessment of risk of bias in each study and outcome is available on the following website: https://www.dropbox.com/s/hi7z3h0ccabdhpb/RoB2%20Figure.xlsx?dl=0 and a summary is presented in Figure 15. ROB 2 judgements and supporting statements are reported in the analysis section for each study and outcome. There were no studies that we should clearly have excluded from this review because of differences in baseline characteristics or poor quality.

15.

15

Summary of risk of bias assessment using Cochrane 'Risk of bias 2' tool.

ACQ: Asthma Control Questionnaire; AE: adverse event; AQLQ: Asthma Quality of Life Questionnaire; CFB: change from baseline; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose; SAE: serious adverse event.

Allocation (selection bias)

All studies were randomised controlled trials (RCT)s and industry sponsored. We confirmed a random allocation sequence using a validated computerised system in 12 studies and assumed an industry‐standard method was used forfive5 studies (Busse 2008Cukier 2013Kerstjens 2012Mansfield 2017Papi 2007). We considered them to be at low risk for random sequence generation and allocation concealment (concealment assumed by automatisation).

Blinding (performance bias and detection bias)

Three studies (Busse 2008Cukier 2013Mansfield 2017) were open label and judged to raise “some concerns”. The rest of the studies were double‐blinded which were rated as at low risk of bias (blinding of participants, personnel, and outcome assessors).

Incomplete outcome data (attrition bias)

Attrition rates for CFB in ACQ at 12 months in Lee 2020 and ACQ responders at 6 and 12 months in van Zyl‐Smit 2020 were 80%, 18% to 23%, and 24%, respectively. We rated the risk of the bias to be high for these outcomes. We tested whether the above studies compromised the validity of the results by excluding them which is reported in the results section.

Selective reporting (reporting bias)

We included pre‐registered trials only and all studies reported expected outcomes in publications or industry generated reports on their websites (e.g., Clinical Study Report).

Other potential sources of bias

Study characteristics across the treatment groups are presented in Table 20 for clinical heterogeneity assessment. The MD‐ICS/LABA group had a lower proportion of participants who had an asthma exacerbation within the previous year (33%) compared to other groups (60% or greater). Otherwise, demographic and clinical characteristics of participants were similar across the treatment groups. We conducted a subgroup analysis for exacerbation outcomes separating studies requiring or not requiring a history of asthma exacerbation in the previous year and labelled them as high and low risk group, respectively.

2. Study characteristics of participants across the treatment groups for clinical heterogeneity assessment.

Treatment arm No. of participants included Mean age Male % White % Maximum pack years allowed for smokers Baseline FEV1 % predicted History asthma exacerbation (%)
MD‐ICS/LABA 3502 48.4 39 82 10 60.3 33
HD‐ICS/LABA 5377 51.2 40 83 10 63.8 60
MD TRIPLE 2652 52.5 39 88 10‐20 57.0 85
HD TRIPLE 4151 52.8 37 88 10‐20 55.9 90

FEV1: forced expiratory volume in 1 second; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta2 agonist; MD: medium dose.

Effects of interventions

See: Table 1; Table 2; Table 3; Table 4; Table 5; Table 6; Table 7; Table 8; Table 9; Table 10; Table 11; Table 12; Table 13; Table 14; Table 15; Table 16; Table 17; Table 18

1. Primary outcome, asthma exacerbations

1.1 Severe asthma exacerbations (asthma‐related hospitalisations)
1.1.1 Grouped treatments

For this outcome, 7 trials (6911 participants) comparing four treatments provided evidence as dichotomous data, and 1 trial (3072 participants) provided evidence as logHR data (Kerstjens 2020). A network diagram for the studies included in the NMA is presented in Figure 1.

A summary of the studies included in the analysis is presented in Appendix 2Bernstein 2015 was excluded from the NMA, as both treatment arms reported zero events, effectively not contributing any evidence to the network. A single study (Kerstjens 2020) contributed logHR evidence on the LD Triple versus MD‐ICS/LABA and MD Triple versus HD‐ICS/LABA comparisons, but only two unconnected pairwise comparisons could be included in the NMA as there was no way to calculate the covariance matrix from the evidence available. These two comparisons were included as if they were from independent studies as they had no treatment arms in common.

1.1.1.1 Model selection and inconsistency checking

A half‐normal (0.52) prior distribution was used to model the between‐study heterogeneity in the random‐effects model (Röver 2021). Model fit parameters for the fixed‐effect and random‐effects models are reported in Appendix 3. Both models fit the data well. The between‐study heterogeneity was low but had a wide credible interval (Crl). As the difference in Deviance Information Criterion (DIC) between the fixed‐effect and random‐effects models was less than 3, the simpler fixed‐effect model was chosen for the overall analysis, as well as the subgroup analyses. Results for the fixed‐effect model are presented in Section 1.1.1.2.

A node‐splitting model was fit to assess the inconsistency in the model. The results of the node‐splitting model are presented in Table 21. There was no evidence to suggest there was any inconsistency in the model.

3. Node‐splitting results for severe exacerbations.
Model p Mean LHR
(95% CrI)
MD Triple vs. HD‐ICS/LABA
Direct 0.717 0.091
(‐0.928, 0.995)
Indirect 0.328
(‐0.785, 1.422)
Network 0.184
(‐0.586, 0.930)
HD Triple vs. MD‐ICS/LABA
Direct 0.492 ‐0.189
(‐1.519, 0.912)
Indirect 0.250
(‐0.606, 1.124)
Network 0.131
(‐0.621, 0.880)
HD Triple vs. MD Triple
Direct 0.506 ‐0.700
(‐2.004, 0.392)
Indirect ‐0.261
(‐1.234, 0.694)
Network ‐0.416
(‐1.235, 0.414)

Negative valued LHR favours the first named treatment. CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; LHR: log hazard ratio; MD: medium dose.

1.1.1.2 NMA results

Hazard ratios (HRs) for severe exacerbations in grouped treatments are presented in Figure 16. The HRs for the comparison of all treatment groups against each other are reported in Table 22. There is insufficient evidence to suggest that there is a change in hazards of severe exacerbations for any of the treatment comparisons. An NMA summary of findings is presented in Table 1

16.

16

Forest plot of hazard ratios for severe exacerbations for grouped treatments. Hazard ratios less than one favors the first named treatment.

CrI: Credible Interval; HD: high dose; HR: hazard ratio; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

4. Hazard ratio for severe exacerbations (fixed‐effect model).
  Median HR (95% CrI)
Comparison Overall High Risk Low Risk
HD‐ICS/LABA vs MD‐ICS/LABA 1.43 (0.76, 2.77) 13.41 (2.04, 191.20)* 0.76 (0.33, 1.80)
MD Triple vs. MD‐ICS/LABA 1.73 (0.90, 3.32) 1.89 (0.80, 4.47) 1.03 (0.36, 2.78)
HD Triple vs MD‐ICS/LABA 1.14 (0.54, 2.41) 11.77 (1.61, 169.90)* 0.56 (0.14, 1.79)
MD Triple vs. HD‐ICS/LABA 1.20 (0.56, 2.53) 0.14 (0.01, 1.14) 1.34 (0.45, 3.87)
HD Triple vs HD‐ICS/LABA 0.79 (0.48, 1.29) 0.85 (0.49, 1.48) 0.73 (0.18, 2.45)
HD Triple vs MD Triple 0.66 (0.29, 1.51) 6.23 (0.70, 104.30)* 0.55 (0.14, 1.85)

The second named treatment is the baseline intervention. Hazard ratio less than one favours the first named treatment. *HRs are extremely uncertain due to network sparsity and should be treated with caution. CrI: credible interval; HD: high dose; HR: hazard ratio; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

The rank plots for grouped treatments are presented in Figure 17, and the mean and median ranks with their corresponding 95% CrIs are presented in Table 23. MD‐ICS/LABA and HD Triple have a higher probability of being better than the other three treatments (median rank 1.0 [95% CrI 1 to 3] and 2 [1 to 4], respectively). However, treatment ranks are very uncertain, displaying wide credible intervals, and all treatments have rank probabilities of 50% and below.

17.

17

Rank plots for grouped treatments for severe exacerbations (fixed effect model).

HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

5. Mean and median ranking for severe exacerbations sorted by mean rank (fixed‐effect model).
  Overall High Risk Subgroup Low Risk Subgroup
Treatments Mean Rank Median Rank 95% CrI Mean Rank Median Rank 95% CrI Mean Rank Median Rank 95% CrI
MD‐ICS/LABA 1.55 1.0 (1.0, 3.0) 1.077 1.0 (1.0, 2.0) 3.05 3.0 (1.0, 4.0)
HD Triple 1.97 2.0 (1.0, 4.0) 3.223 3.0 (2.0, 4.0) 1.64 1.0 (1.0, 4.0)
HD‐ICS/LABA 3.01 3.0 (1.0, 4.0) 3.679 4.0 (3.0, 4.0) 2.25 2.0 (1.0, 4.0)
MD Triple 3.47 4.0 (1.0, 4.0) 2.021 2.0 (1.0, 4.0) 3.06 3.0 (1.0, 4.0)

CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

Results for the subgroups were largely consistent with the overall analysis (Table 22). The only exception is the comparison of HD‐ICS/LABA vs. MD‐ICS/LABA where HD‐ICS/LABA increased the hazards of severe exacerbations compared to MD‐ICS/LABA in the high‐risk group (HR 13.4 [95% CrI 2.0 to 191.2]), although the credible interval indicates that this estimate is very uncertain. Due to the sparse nature of the network for the high‐risk group, HRs for the HD‐ICS/LABA vs. MD‐ICS/LABA, HD Triple vs. MD‐ICS/LABA, and HD Triple vs. MD Triple comparisons were extremely uncertain. Details of the subgroup analyses are described below.

1.1.1.2.1 High‐risk subgroup

For this outcome, 5 trials (7063 participants) provided evidence as dichotomous data across four individual treatments. A network diagram for the studies included in the NMA is presented as Figure 18. This network is very sparse, treatments are only connected by a single study and there are no evidence loops.

18.

18

Network diagram for severe exacerbations for high‐risk individuals.

The size of the nodes and the thickness of edges depend on the number of people randomised and the number of trials conducted. HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

A summary of the studies included in the analysis is presented in Appendix 2. A single study (Kerstjens 2020) contributed logHR evidence, but only two unconnected pairwise comparisons were included in the NMA as independent studies as there was no way to calculate the covariance matrix from the evidence available.

A half‐normal(0.502) prior distribution was used to model the between‐study heterogeneity in the random‐effects model (Röver 2021). Model fit parameters for the fixed‐ and random‐effects models are reported in Appendix 3. Both fixed‐effect and random‐effects models fit the data well. There was moderate between‐study heterogeneity with a wide 95% credible interval. As the difference in DIC between the fixed‐ and random‐effects models was less than 3, the simpler fixed‐effect model was chosen. There is no potential for inconsistency in this network as there is no independent, indirect evidence for any of the comparisons.

Hazard ratios for severe exacerbations in high‐risk studies are presented in Figure 19. The HRs for the comparison of all treatment groups against each other are reported in Table 22. The impact of the sparse evidence, exhibited in the network diagram can be seen in the number of comparisons for which HRs were extremely uncertain (highlighted in yellow in Table 22).

19.

19

Forest plot of hazard ratios for severe exacerbations for high‐risk individuals.

Hazard ratio less than one favours the first named treatment. Crl: credible interval, HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

The rank plots are presented in Figure 20, and the mean and median ranks with their corresponding 95% CrIs are presented in Table 23. MD‐ICS/LABA had the highest probability of being ranked the best treatment (median rank 1 [95% CrI 1 to 2]). However, the 95% credible intervals for all other treatments are wide, reflecting the high uncertainty in the HRs estimated and treatment rankings.

20.

20

Rank plots for severe exacerbations for high‐risk individuals. (fixed effect model).

HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

1.1.1.2.2 Low‐risk subgroup

For this outcome, 5 trials (4436 participants) comparing four treatments provided evidence as dichotomous data. A network diagram for the studies included in the NMA is presented in Figure 21. A summary of the studies included in the analysis is presented in Appendix 2Bernstein 2015 was excluded from the NMA, as both treatment arms reported zero events, effectively not contributing any evidence to the network.

21.

21

Network diagram for severe exacerbations for low‐risk individuals.

The size of the nodes and the thickness of edges depend on the number of people randomised and the number of trials conducted. HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

A half‐normal(0.52) prior distribution was used to model the between‐study heterogeneity in the random‐effects model (Röver 2021). Model fit parameters for the fixed‐effect and random‐effects models are reported in Appendix 3. Both models fit the data well. There was moderate between‐study heterogeneity, with a wide 95% credible interval. As the difference in DICs between the fixed‐effect and random‐effects models was less than 3, the simpler fixed‐effect model was chosen. There is no potential for inconsistency in this network as there is no independent indirect evidence for any of the comparisons.

Hazard ratios for severe exacerbations in low‐risk studies are presented in Figure 22. The HRs for the comparison of all treatment groups against each other are reported in Table 22. There is insufficient evidence to suggest that there is a change in hazards of severe exacerbations for any of the treatment comparisons.

22.

22

Forest plot of hazard ratios for severe exacerbations for low‐risk individuals.

Hazard ratio less than one favours the first named treatment. Crl: credible interval, HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

The rank plots for grouped treatments are presented in Figure 23, and the mean and median ranks with their corresponding 95% CrIs are presented in Table 23. HD Triple ranks higher than the other treatments (median rank 1 [95% CrI 1 to 4]), but the wide credible intervals demonstrate the uncertainty in treatment rankings.

23.

23

Rank plots for severe exacerbations for low‐risk individuals. (fixed effect model).

HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

1.1.1.3 Threshold analysis

The forest plot for the threshold analysis is presented in Figure 24 and the thresholds and new optimum treatments, based only on the treatment with the best relative effect, are presented in Table 24. Credible intervals for the HD‐ICS/LABA vs. MD‐ICS/LABA, MD Triple versus MD‐ICS/LABA, HD Triple versus HD‐ICS/LABA, and HD Triple versus MD Triple comparisons extend beyond the limits of the invariance intervals, suggesting the recommended treatment is sensitive to uncertainty in the data. The recommended treatment did seem to be sensitive to moderate potential bias in the negative direction for the HD‐ICS/LABA vs. MD‐ICS/LABA, MD Triple vs. MD‐ICS/LABA, and HD Triple versus HD‐ICS/LABA comparisons, which would make HD Triple the recommended treatment. This is consistent with the ranks discussed in Section 1.1.1.2, where HD Triple is ranked the next best treatment after MD‐ICS/LABA.

24.

24

Forest plot for threshold analysis for grouped treatments for severe exacerbations (fixed effect model)

Treatment Codes: 1=MD‐ICS/LABA, 2= HD‐ICS/LABA, 3=MD Triple, 4= HD Triple. The optimum treatment for this analysis was MD‐ICS/LABA.

HD: high dose; HR: hazard ratio; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; LD: low dose; MD: medium dose; NT: no threshold (no amount of change in this direction would change the recommendation).

6. Thresholds for severe exacerbations.
  Lower Threshold Upper Threshold
Comparison New Optimal Treatment Change in lnHR New Optimal Treatment Change in lnHR
HD‐ICS/LABA vs. MD‐ICS/LABA HD Triple ‐0.220 N/A Inf
MD Triple vs. MD‐ICS/LABA HD Triple ‐0.481 N/A Inf
HD Triple vs. MD‐ICS/LABA HD Triple ‐0.958 N/A Inf
MD Triple vs. HD‐ICS/LABA MD Triple ‐3.574 HD Triple 1.190
HD Triple vs. HD‐ICS/LABA HD Triple ‐0.186 HD‐ICS/LABA 2.013
HD Triple vs. MD Triple HD Triple ‐0.807 MD Triple 4.990

CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; Inf= Infinity; lnHR=log hazard ratio; LABA: long‐acting beta‐2 agonist; MD: medium dose; N/A= Not Applicable.

1.1.1.4 Pairwise meta‐analysis

The evidence suggests there is little or no difference in severe exacerbations for any of the treatment comparisons (7 trials, 6911 participants; [low to moderate certainty]) (Analysis 1.1Table 2). The results are qualitatively similar to those of the NMA as shown in Table 21. There is no difference in severe exacerbations comparing triple (ICS/LABA/LAMA) with dual therapy (ICS/LABA) when analysed combining MD‐ and HD‐ICS formulations in each combination therapy. There was no difference in the results between fixed‐effect and random‐effects models.

1.1. Analysis.

1.1

Comparison 1: Asthma exacerbations, Outcome 1: Severe exacerbations

The results of subgroup analyses are presented in Analysis 6.1Analysis 6.2Analysis 6.3Analysis 6.4Analysis 6.5Analysis 6.6Analysis 6.7). The results are consistent with the whole group analysis except for HD‐ICS/LABA vs. MD‐ICS/LABA in the high‐risk group in which HD‐ICS/LABA was associated with a higher risk of severe exacerbations compared to MD‐ICS/LABA (1 trial, 1562 participants; RR 8.27 [95% CI 1.09 to 62.72], Analysis 6.1).

6.1. Analysis.

6.1

Comparison 6: Severe exacerbations (high and low risk subgroups), Outcome 1: HD‐ICS/LABA vs MD‐ICS/LABA

6.2. Analysis.

6.2

Comparison 6: Severe exacerbations (high and low risk subgroups), Outcome 2: MD TRIPLE vs MD‐ICS/LABA

6.3. Analysis.

6.3

Comparison 6: Severe exacerbations (high and low risk subgroups), Outcome 3: HD TRIPLE vs MD‐ICS/LABA

6.4. Analysis.

6.4

Comparison 6: Severe exacerbations (high and low risk subgroups), Outcome 4: MD TRIPLE vs HD‐ICS/LABA

6.5. Analysis.

6.5

Comparison 6: Severe exacerbations (high and low risk subgroups), Outcome 5: HD TRIPLE vs HD‐ICS/LABA

6.6. Analysis.

6.6

Comparison 6: Severe exacerbations (high and low risk subgroups), Outcome 6: HD TRIPLE vs MD TRIPLE

6.7. Analysis.

6.7

Comparison 6: Severe exacerbations (high and low risk subgroups), Outcome 7: TRIPLE vs DUAL

1.1.2 Individual treatments

For this outcome, 9 trials (7217 participants) provided evidence as dichotomous data, and 1 trial (3072 participants) provided evidence as logHR data (Kerstjens 2020), comparing 14 treatments across the network. A network diagram for the studies included in the NMA is presented as Figure 25. A summary of the studies included in the analysis is presented in Appendix 4. The dichotomous study Bernstein 2015 was excluded from the NMA, as both treatment arms reported zero events, effectively not contributing any evidence to the network. A single study (Kerstjens 2020) contributed logHR evidence, but only two unconnected pairwise comparisons were included in the NMA as independent studies as there was no way to calculate the covariance matrix from the evidence available. We added a continuity correction of 0.5 to the zero count events to help improve model convergence due to the sparsity of the evidence in Mansfield 2017.

25.

25

Network diagram for severe exacerbations for individual interventions.

Node colors denote the treatment group. The size of the nodes and the thickness of edges depend on the number of people randomised and the number of trials conducted. BUD:budesonide, CrI:Credible Interval, FF:fluticasone furoate, FM:formoterol, FP:fluticasone propionate, GLY: glycopyrronium, IND:indacaterol, MF:mometasone furoate, SAL:salmeterol, Tio: tiotropium, UMEC: umeclidinium, VI:vilanterol.

1.1.2.1 Model selection and inconsistency checking

A half‐normal (0, 0.52) prior was used to model the between‐study heterogeneity in the random‐effects model (Röver 2021). Model fit parameters for the fixed‐effect and random‐effects models are reported in Appendix 3. Both fixed‐effect and random‐effects models fit the data well. The between‐study heterogeneity was low but with a wide credible interval. As the difference in DICs between the fixed‐effect and random‐effects models was less than 3, the simpler fixed‐effect model was chosen. Results for the fixed‐effect model are presented in Section 1.1.2.2. There is no potential for inconsistency in this network as there is no independent, indirect evidence for any of the comparisons.

1.1.2.2 NMA results

Hazard ratios for severe exacerbations in individual treatments, compared to fluticasone propionate/salmeterol (FP/SAL) 250/50 µg (MD‐ICS/LABA) are presented in Figure 26. The HRs for the comparison of all treatment groups against each other are reported in Table 25. The impact of the sparse evidence available for each comparison can be seen in the number of comparisons for which the HRs are extremely uncertain (highlighted in yellow in Table 25).

26.

26

Forest plot of hazard ratios relative to FP/SAL 250 for severe exacerbations for individual treatments.

Hazard ratio less than one favors the first named treatment. BUD:budesonide, CrI:Credible Interval, FF:fluticasone furoate, FM:formoterol, FP:fluticasone propionate, GLY: glycopyrronium, HR: hazard ratio; IND:indacaterol, MF:mometasone furoate, SAL:salmeterol, UMEC: umeclidinium, VI:vilanterol

7. Hazard ratio for severe exacerbations for individual treatments (fixed‐effect model).
Comparison Median HR (95% CrI)
BUD/FM 320 vs. FP/SAL 250 0.40 (0.01, 5.33)
FF/VI 100 vs. FP/SAL 250 0.38 (0.01, 4.50)
MF/IND 160 vs. FP/SAL 250 3.00 (0.06, 78.87)*
FP/FM 250 vs. FP/SAL 250 0.07 (0.0001, 5.64)
FP/SAL 200 vs. FP/SAL 250 9.34 (0.59, 464.10)*
FP/SAL 500 vs. FP/SAL 250 6.92 (1.61, 80.79)*
BUD/FM 640 vs. FP/SAL 250 0.11 (0.002, 3.51)
FF/VI 200 vs. FP/SAL 250 0.26 (0.01, 4.13)
MF/IND 320 vs. FP/SAL 250 11.70 (1.00, 237.80)*
MF/GLY/IND 80 vs. FP/SAL 250 5.77 (0.10, 170.20)*
FF/UMEC/VI 100 vs. FP/SAL 250 0.37 (0.010, 5.52)
MF/GLY/IND 160 vs. FP/SAL 250 7.10 (1.17, 93.56)*
FF/UMEC/VI 200 vs. FP/SAL 250 0.20 (0.005, 3.24)
FF/VI 100 vs. BUD/FM 320 0.94 (0.012, 62.44)*
MF/IND 160 vs. BUD/FM 320 7.87 (0.06, 812.80)*
FP/FM 250 vs. BUD/FM 320 0.20 (0.0004, 5.64)
FP/SAL 200 vs. BUD/FM 320 26.98 (0.53, 3628)*
FP/SAL 500 vs. BUD/FM 320 19.87 (0.88, 1034)*
BUD/FM 640 vs. BUD/FM 320 0.29 (0.03, 2.82)
FF/VI 200 vs. BUD/FM 320 0.64 (0.007, 50.68)*
MF/IND 320 vs. BUD/FM 320 32.17 (0.84, 2463)*
MF/GLY/IND 80 vs. BUD/FM 320 14.87 (0.11, 1687)*
FF/UMEC/VI 100 vs. BUD/FM 320 0.92 (0.01, 70.48)*
MF/GLY/IND 160 vs. BUD/FM 320 19.92 (0.74, 1124)*
FF/UMEC/VI 200 vs. BUD/FM 320 0.49 (0.006, 38.79)
MF/IND 160 vs. FF/VI 100 8.54 (0.08, 785.50)*
FP/FM 250 vs. FF/VI 100 0.18 (0.0002, 46.45)
FP/SAL 200 vs. FF/VI 100 28.91 (0.60, 3650)*
FP/SAL 500 vs. FF/VI 100 21.04 (0.93, 1036)*
BUD/FM 640 vs. FF/VI 100 0.32 (0.003, 39.12)
FF/VI 200 vs. FF/VI 100 0.69 (0.20, 2.21)
MF/IND 320 vs. FF/VI 100 34.58 (0.84, 2500)*
MF/GLY/IND 80 vs. FF/VI 100 16.25 (0.13, 1628)*
FF/UMEC/VI 100 vs. FF/VI 100 0.99 (0.34, 2.93)
MF/GLY/IND 160 vs. FF/VI 100 21.23 (0.79, 1173)*
FF/UMEC/VI 200 vs. FF/VI 100 0.54 (0.14,1.84)
FP/FM 250 vs. MF/IND 160 0.02 (0.00001, 8.51)
FP/SAL 200 vs. MF/IND 160 3.35 (0.09, 372.80)*
FP/SAL 500 vs. MF/IND 160 2.41 (0.20, 100.10)*
BUD/FM 640 vs. MF/IND 160 0.04 (0.0002, 8.01)
FF/VI 200 vs. MF/IND 160 0.08 (0.0007, 10.23)
MF/IND 320 vs. MF/IND 160 3.79 (0.41, 147.00)*
MF/GLY/IND 80 vs. MF/IND 160 1.89 (0.80, 4.47)
FF/UMEC/VI 100 vs. MF/IND 160 0.12 (0.001, 14.12)
MF/GLY/IND 160 vs. MF/IND 160 2.45 (0.17, 109.20)*
FF/UMEC/VI 200 vs. MF/IND 160 0.06 (0.0006, 8.22)
FP/SAL 200 vs. FP/FM 250 170.90 (0.74, 284800)*
FP/SAL 500 vs. FP/FM 250 121.20 (0.98, 127600)*
BUD/FM 640 vs. FP/FM 250 1.61 (0.03, 949.80)*
FF/VI 200 vs. FP/FM 250 3.81 (0.01, 5159)*
MF/IND 320 vs. FP/FM 250 200.60 (1.10, 272600)*
MF/GLY/IND 80 vs. FP/FM 250 91.20 (0.21, 145100)*
FF/UMEC/VI 100 vs. FP/FM 250 5.51 (0.02, 7370)*
MF/GLY/IND 160 vs. FP/FM 250 122.10 (0.86, 136600)*
FF/UMEC/VI 200 vs. FP/FM 250 2.96 (0.01, 4057)*
FP/SAL 500 vs. FP/SAL 200 0.82 (0.03, 8.69)
BUD/FM 640 vs. FP/SAL 200 0.01 (0.0001, 1.03)
FF/VI 200 vs. FP/SAL 200 0.02 (0.0002, 1.38)
MF/IND 320 vs. FP/SAL 200 1.25 (0.03, 30.15)
MF/GLY/IND 80 vs. FP/SAL 200 0.56 (0.005, 23.05)
FF/UMEC/VI 100 vs. FP/SAL 200 0.03 (0.0002, 1.91)
MF/GLY/IND 160 vs. FP/SAL 200 0.81 (0.03, 10.71)
FF/UMEC/VI 200 vs. FP/SAL 200 0.02 (0.0001, 1.13)
BUD/FM 640 vs. FP/SAL 500 0.01 (0.0002, 0.71)
FF/VI 200 vs. FP/SAL 500 0.03 (0.001, 0.93)
MF/IND 320 vs. FP/SAL 500 1.57 (0.24, 12.53)
MF/GLY/IND 80 vs. FP/SAL 500 0.77 (0.02, 10.92)
FF/UMEC/VI 100 vs. FP/SAL 500 0.05 (0.001, 1.26)
MF/GLY/IND 160 vs. FP/SAL 500 1.00 (0.37, 2.68)
FF/UMEC/VI 200 vs. FP/SAL 500 0.02 (0.0004, 0.73)
FF/VI 200 vs. BUD/FM 640 2.15 (0.01, 299.50)*
MF/IND 320 vs. BUD/FM 640 112.30 (1.463, 15230)*
MF/GLY/IND 80 vs. BUD/FM 640 51.28 (0.23, 9561)*
FF/UMEC/VI 100 vs. BUD/FM 640 3.09 (0.02, 410.20)*
MF/GLY/IND 160 vs. BUD/FM 640 69.57 (1.25, 6911)*
FF/UMEC/VI 200 vs. BUD/FM 640 1.66 (0.01, 228.10)*
MF/IND 320 vs. FF/VI 200 51.33 (1.03, 4278)*
MF/GLY/IND 80 vs. FF/VI 200 23.70 (0.17, 2801)*
FF/UMEC/VI 100 vs. FF/VI 200 1.43 (0.44,4.97)
MF/GLY/IND 160 vs. FF/VI 200 31.90 (0.94, 2048)*
FF/UMEC/VI 200 vs. FF/VI 200 0.78 (0.18, 3.10)
MF/GLY/IND 80 vs. MF/IND 320 0.49 (0.01, 5.52)
FF/UMEC/VI 100 vs. MF/IND 320 0.03 (0.0003, 1.39)
MF/GLY/IND 160 vs. MF/IND 320 0.64 (0.06, 5.34)
FF/UMEC/VI 200 vs. MF/IND 320 0.02 (0.0002, 0.80)
FF/UMEC/VI 100 vs. MF/GLY/IND 80 0.06 (0.0005, 8.15)
MF/GLY/IND 160 vs. MF/GLY/IND 80 1.31 (0.08, 62.71)*
FF/UMEC/VI 200 vs. MF/GLY/IND 80 0.03 (0.0003, 4.74)
MF/GLY/IND 160 vs. FF/UMEC/VI 100 21.94 (0.68, 1362)*
FF/UMEC/VI 200 vs. FF/UMEC/VI 100 0.55 (0.14, 1.89)
FF/UMEC/VI 200 vs. MF/GLY/IND/160 0.02 (0.0004, 0.85)

The second named treatment is the baseline intervention. Hazard ratio less than one favours the first named treatment. Treatment comparisons in bold do not include the “null” effect. *HRs are extremely uncertain due to network sparsity and should be interpreted with caution. BUD=budesonide, CrI=Credible Interval, FF=fluticasone furoate, FM=formoterol, FP=fluticasone propionate, GLY= glycopyrronium, HR=hazard ratio, IND=indacaterol, MF=mometasone furoate, SAL=salmeterol, UMEC= umeclidinium, VI=vilanterol.

The rank plots for individual treatments are presented in Figure 27, and the mean and median ranks with their corresponding 95% CrIs are presented in Table 26. Overall, treatment ranks are very uncertain displaying wide credible intervals, and all treatments have rank probabilities of less than 50%.

27.

27

Rank plots for individual treatments for severe exacerbations (fixed effect model).

Line colors denote the treatment group. BUD:budesonide, FF:fluticasone furoate, FM:formoterol, FP:fluticasone propionate, GLY: glycopyrronium, IND:indacaterol, MF:mometasone furoate, SAL:salmeterol, Tio:tiotropium, UMEC: umeclidinium, VI:vilanterol.

8. Mean and median ranking for individual treatments for severe exacerbations sorted by mean rank (fixed‐effect model).
Treatments Mean Rank Median Rank 95% CrI
FP/FM 250 3.24 2.0 (1.0, 11.0)
BUD/FM 640 3.49 2.0 (1.0, 10.0)
FF/UMEC/VI 200 3.71 3.0 (1.0, 9.0)
FF/VI 200 4.42 4.0 (1.0, 10.0)
BUD/FM 320 5.62 6.0 (2.0, 11.0)
FF/VI 100 5.64 5.0 (2.0, 11.0)
FF/UMEC/VI 100 5.64 5.0 (2.0, 11.0)
FP/SAL 250 7.31 8.0 (3.0, 10.0)
MF/IND 160 8.70 9.0 (1.0, 13.0)
MF/GLY/IND 80 10.60 11.0 (3.0, 14.0)
MF/GLY/IND 160 11.36 11.0 (8.0, 14.0)
FP/SAL 500 11.41 12.0 (9.0, 14.0)
FP/SAL 200 11.59 12.0 (6.0, 14.0)
MF/IND 320 12.27 13.0 (8.0, 14.0)

BUD=budesonide, CrI=Credible Interval, FF=fluticasone furoate, FM=formoterol, FP=fluticasone propionate, GLY= glycopyrronium, IND=indacaterol, MF=mometasone furoate, SAL=salmeterol, UMEC= umeclidinium, VI=vilanterol

1.2 Primary outcome: moderate to severe (steroid‐requiring) asthma exacerbations
1.2.1 Grouped treatments

For this outcome, 10 trials (12,407 participants) comparing four treatments provided evidence as dichotomous data. A network diagram for the studies included in the NMA is presented as Figure 2. A summary of the studies included in the analysis is presented in Appendix 5.

1.2.1.1 Model selection and inconsistency checking

Model fit parameters for the fixed‐effect and random‐effects models are reported in Appendix 3. Both fixed‐effect‐ and random‐effects models fit the data well. The between‐study heterogeneity was low. As the difference in DICs between the fixed‐effect and random‐effects models was less than 3, the simpler fixed‐effect model was chosen for the overall analysis, as well as the subgroup analyses. Results for the fixed‐effect model are presented in Section 1.2.1.2.

A node‐splitting model was fit to assess the inconsistency in the model. The results of the node‐splitting model are presented in Table 27. There was no evidence to suggest any inconsistency in the model.

9. Node‐splitting results for moderate to severe exacerbations for grouped treatments.
Overall High Risk Subgroup
Model p Mean LHR
(95% CrI)
Model p Mean LHR
(95% CrI)
HD‐ICS/LABA vs. MD‐ICS/LABA HD‐ICS/LABA vs. MD‐ICS/LABA
Direct 0.556 ‐0.100
(‐0.318, 0.118)
Direct 0.616 ‐0.043
(‐0.705, 0.639)
Indirect ‐0.268
(‐0.858, 0.289)
Indirect ‐0.250
(‐1.361, 0.706)
Network ‐0.120
(‐0.303, 0.059)
Network ‐0.087
(‐0.456, 0.236)
MD Triple vs. MD‐ICS/LABA MD Triple vs. MD‐ICS/LABA
Direct 0.439 ‐0.192
(‐0.409, 0.020)
Direct 0.505 ‐0.302
(‐0.987, 0.365)
Indirect 0.368
(‐1.196, 1.931)
Indirect ‐0.574
(‐1.654, 0.325)
Network ‐0.177
(‐0.376, 0.026)
Network ‐0.369
(‐0.748, ‐0.046)
HD Triple vs. MD‐ICS/LABA NA
Direct 0.574 ‐0.324
(‐0.650, ‐0.007)
Direct NA NA
Indirect ‐0.460
(‐0.885, ‐0.039)
Indirect NA
Network ‐0.377
(‐0.581, ‐0.168)
Network NA
MD Triple vs. HD‐ICS/LABA MD Triple vs. HD‐ICS/LABA
Direct 0.313 0.019
(‐0.254, 0.341)
Direct 0.803 ‐0.108
(‐0.790, 0.582)
Indirect ‐0.244
(‐0.704, 0.255)
Indirect ‐0.208
(‐1.016, 0.892)
Network ‐0.059
(‐0.255, 0.162)
Network ‐0.140
(‐0.457, 0.218)
HD Triple vs. HD‐ICS/LABA NA
Direct 0.413 ‐0.238
(‐0.418, ‐0.047)
Direct NA NA
Indirect ‐0.858
(‐2.616, 0.627)
Indirect NA
Network ‐0.258
(‐0.421, ‐0.085)
Network NA
HD Triple vs. MD Triple NA
Direct 0.573 ‐0.221
(‐0.526, 0.053)
Direct NA NA
Indirect ‐0.061
(‐0.604, 0.490)
Indirect NA
Network ‐0.199
(‐0.430, 0.017)
Network NA

CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; LHR: log hazard ratio; MD: medium dose; NA: not applicable.

1.2.1.2 NMA results

Hazard ratios for moderate to severe exacerbations in grouped treatments are presented in Figure 28. The HRs for the comparison of all treatment groups against each other are reported in Table 28. There is evidence to suggest that HD Triple reduces the hazards of moderate‐severe exacerbations compared to MD‐ICS/LABA and HD‐ICS/LABA (HR 0.69 [95% CrI 0.58 to 0.82] and 0.93 [0.79 to 0.88], respectively). There is also marginal evidence to suggest that MD Triple reduces the hazards of moderate‐severe exacerbations compared to MD‐ICS/LABA (HR 0.84 [95% CrI 0.71 to 0.99] and HD Triple reduces the hazards of moderate‐severe exacerbations compared to MD Triple (HR 0.83, 95% CrI [0.69 to 0.996], absolute risk reduction (ARR) 34 fewer per 1000 patients). An NMA summary of findings is presented in Table 3.

28.

28

Forest plot of hazard ratios relative for moderate to severe exacerbations for grouped treatments.

Hazard ratio less than one favors the first named treatment. CrI: Credible Interval; HD: high dose; HR: hazard ratio; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

10. Hazard ratio for moderate to severe exacerbations (fixed‐effect model).
  Median HR (95% CrI)
Comparison Overall High Risk Low Risk
HD‐ICS/LABA vs MD‐ICS/LABA 0.90 (0.77, 1.04) 0.92 (0.76, 1.12) 0.85 (0.67, 1.08)
MD Triple vs. MD‐ICS/LABA 0.84 (0.71, 0.99) 0.80 (0.66, 0.97) 1.01 (0.72, 1.41)
HD Triple vs MD‐ICS/LABA 0.69 (0.58, 0.82) 0.70 (0.56, 0.87) 0.76 (0.53, 1.08)
MD Triple vs. HD‐ICS/LABA 0.93 (0.79, 1.10) 0.87 (0.71, 1.06) 1.19 (0.84, 1.66)
HD Triple vs HD‐ICS/LABA 0.77 (0.67, 0.88) 0.76 (0.65, 0.88) 0.89 (0.62, 1.27)
HD Triple vs MD Triple 0.83 (0.69, 1.00) 0.87 (0.70, 1.08) 0.75 (0.51, 1.09)

The second named treatment is the baseline intervention. Hazard ratio less than one favours the first named treatment. Treatment comparisons in bold do not include the “null” effect. CrI: credible interval; HD: high dose; HR: hazard ratio; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

The rank plots for grouped treatments are presented in Figure 29, and the mean and median ranks with their corresponding 95% CrIs are presented in Table 29. HD Triple ranks higher than the other treatments (median rank 1 [95%CrI 1 to 1]).

29.

29

Rank plots for grouped treatments for moderate to severe exacerbations (fixed effect model).

HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

11. Mean and median ranking for moderate to severe exacerbations sorted by mean rank (fixed‐effect model).
  Overall High Risk Subgroup Low Risk Subgroup
Treatments Mean Rank Median Rank 95% CrI Mean Rank Median Rank 95% CrI Mean Rank Median Rank 95% CrI
HD Triple 1.02 1.0 (1.0, 1.0) 1.11 1.0 (1.0, 2.0) 1.39 1.0 (1.0, 3.0)
MD Triple 2.21 2.0 (2.0, 3.0) 1.98 2.0 (1.0, 3.0) 3.29 4.0 (1.0, 4.0)
HD‐ICS/LABA 2.86 3.0 (2.0, 4.0) 3.13 3.0 (2.0, 4.0) 1.98 2.0 (1.0, 4.0)
MD‐ICS/LABA 3.91 4.0 (3.0, 4.0) 3.78 4.0 (3.0, 4.0) 3.33 3.0 (2.0, 4.0)

CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

1.2.1.2.1 High‐risk subgroup

For this outcome, 5 trials (7063 participants) provided evidence as dichotomous data across four individual treatments. A network diagram for the studies included in the NMA is presented in Figure 30. A summary of the studies included in the analysis is presented in Appendix 5.

30.

30

Network diagram for moderate to severe exacerbations for high‐risk individuals.

The size of the nodes and the thickness of edges depend on the number of people randomised and the number of trials conducted. HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

Model fit parameters for the fixed‐effect‐ and random‐effects models are reported in Appendix 3. Both fixed‐effect and random‐effects models fit the data well. The between‐study heterogeneity was low, but the credible interval was wide. As the difference in DICs between the fixed‐effect and random‐effects models was less than 3, the simpler fixed‐effect model was chosen.

A node‐splitting model was fit to assess the inconsistency in the model. The results of the node‐splitting model are presented in Table 27. There was no evidence to suggest there was any inconsistency in the model.

Hazard ratios for moderate‐severe exacerbations are presented in Figure 31. The HRs for the comparison of all treatment groups against each other are reported in Table 28. There is evidence to suggest that MD Triple and HD Triple reduce the hazards of moderate‐severe exacerbations compared to MD‐ICS/LABA (HR 0.80 [95% CrI 0.66 to 0.97] and 0.70 [0.56 to 0.87], respectively) and HD Triple reduces the hazards of moderate‐severe exacerbations compared to HD‐ICS/LABA (HR 0.76 [95% CrI 0.65 to 0.88]). This is consistent with the results for the overall NMA (Table 28).

31.

31

Forest plot of hazard ratios for moderate to severe exacerbations for high‐risk individuals.

Hazard ratio less than one favours the first named treatment. Crl: credible interval, HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

The rank plots for grouped treatments are presented in Figure 32, and the mean and median ranks with their corresponding 95% CrIs are presented in Table 29. HD Triple ranked marginally better than MD Triple, both of which ranked better than the other treatments (median rank 1 [95% CrI 1 to 2] and 2 [1 to 3], respectively), but overall, treatment ranks are very uncertain, with very wide credible intervals.

32.

32

Rank plots for modearate to severe exacerbations for high‐risk individuals. (fixed effect model).

HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

1.2.1.2.2 Low‐risk subgroup

For this outcome, 5 trials (4436 participants) comparing four treatments provided evidence as dichotomous data. A network diagram for the studies included in the NMA is presented as Figure 33. A summary of the studies included in the analysis is presented in Appendix 5.

33.

33

Network diagram for moderate to severe exacerbations for low‐risk individuals.

The size of the nodes and the thickness of edges depend on the number of people randomised and the number of trials conducted. HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

Model fit parameters for the fixed‐effect‐ and random‐effects models are reported in Appendix 3. Both fixed‐effect‐ and random‐effects models fit the data well. There was moderate between‐study heterogeneity in the random‐effects model with a wide credible interval. As the difference in DICs between the fixed‐effect and random‐effects models was less than 3, the simpler fixed‐effect model was chosen. A node‐splitting analysis was not performed because there is no potential for inconsistency in this network as there is no independent, indirect evidence for any of the comparisons.

Hazard ratios for moderate‐severe exacerbations in low‐risk individuals are presented in Figure 34. The HRs for the comparison of all treatment groups against each other are reported in Table 28. There is insufficient evidence to suggest that there is a change in hazards of moderate‐severe exacerbations for any of the treatment comparisons.

34.

34

Forest plot of hazard ratios for moderate to severe exacerbations for low‐risk individuals.

Hazard ratio less than one favours the first named treatment. Crl: credible interval, HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

The rank plots are presented in Figure 35, and the mean and median ranks with their corresponding 95% CrIs are presented in Table 29. HD Triple ranks higher than the other treatments, but the wide credible intervals demonstrate the uncertainty in treatment rankings (median rank 1 [95% CrI 1 to 3]).

35.

35

Rank plots for modearate to severe exacerbations for low‐risk individuals. (fixed effect model).

HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

1.2.1.3 Threshold analysis

The forest plot for the threshold analysis is presented in Figure 36 and the thresholds and new optimum treatments are presented in Table 30.

36.

36

Forest plot for threshold analysis for moderate to severe exacerbations for grouped treatments (fixed effect model).

Treatment Codes: 1=MD‐ICS/LABA, 2= HD‐ICS/LABA, 3=MD Triple, 4= HD Triple. The optimum treatment for this analysis was HD Triple.

HD: high dose; HR: hazard ratio; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose; NT: no threshold (no amount of change in this direction would change the recommendation).

12. Thresholds and new optimum treatments for moderate to severe exacerbations for grouped treatments.
  Lower Threshold Upper Threshold
Comparison New Optimal Treatment Change in lnHR New Optimal Treatment Change in lnHR
HD‐ICS/LABA vs. MD‐ICS/LABA HD‐ICS/LABA ‐1.84 MD‐ICS/LABA 0.77
MD Triple vs. MD‐ICS/LABA MD Triple ‐0.56 MD‐ICS/LABA 1.47
HD Triple vs. MD‐ICS/LABA N/A ‐Inf MD Triple 1.13
MD Triple vs. HD‐ICS/LABA MD Triple ‐0.55 HD‐ICS/LABA 2.78
HD Triple vs. HD‐ICS/LABA N/A ‐Inf HD‐ICS/LABA 0.34
HD Triple vs. MD Triple N/A ‐Inf MD Triple 0.60

CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; Inf= Infinity; LABA: long‐acting beta‐2 agonist; lnHR: log hazard ratio; MD: medium dose; N/A; not applicable

No credible intervals extended beyond the limits of the invariant intervals for any comparison, therefore the recommended treatment is not sensitive to the uncertainty in the data. The recommended treatment did seem to be sensitive to moderate potential bias in the negative direction for MD Triple versus MD‐ICS/LABA, MD Triple vs. HD‐ICS/LABA, which would make MD Triple the recommended treatment. This is consistent with the ranks discussed in Section 1.2.1.2, where MD Triple is ranked the next best treatment after HD Triple.

A change in the positive direction in the HD Triple versus HD‐ICS/LABA comparison could also change the preferred treatment to HD‐ICS/LABA. However, all these thresholds (Table 30) are relatively high and changes do not seem to be very plausible.

1.2.1.4 Pairwise meta‐analysis

Results from the pairwise meta‐analysis are qualitatively similar to those of the NMA (Analysis 1.2Table 2). There is no qualitative difference between direct and NMA estimates (Table 27). There is little evidence to suggest HD‐ICS/LABA reduces moderate to severe exacerbations compared to MD‐ICS/LABA (6 trials, 5452 participants, RR 0.93 [95% CI 0.82 to 1.05]; I2 =0% [high certainty]).

1.2. Analysis.

1.2

Comparison 1: Asthma exacerbations, Outcome 2: Moderate to severe exacerbations

HD TRIPLE likely results in a slight reduction in moderate to severe exacerbations compared to MD TRIPLE (3 trials, 3470 participants, RR 0.85 [95% CI 0.72 to 1.01]; I2 = 0%; ARR 23 fewer per 1000 patients [moderate certainty]).

Triple therapy (ICS/LABA/LAMA) reduces moderate to severe exacerbations compared to dual (ICS/LABA) therapy when analysed combining all MD‐ and HD‐ICS formulations in each combination therapy (5 trials, 8173 participants; RR 0.85 [95% CI 0.78 to 0.92]; I2 =0% [high certainty]). There was no difference in the results between fixed‐effect and random‐effects models.

In the subgroup analyses, the evidence suggests HD TRIPLE reduces moderate to severe exacerbations compared to MD TRIPLE slightly in the high risk subgroup (RR 0.89 [95% CI 0.73 to 1.09]; ARR 15 fewer per 1000 patients; [moderate certainty] and moderately in the low risk subgroup (RR 0.79 [95% CI 0.57 to 1.08]; ARR 37 fewer per 1000 patients; [low certainty] Analysis 7.6).

7.6. Analysis.

7.6

Comparison 7: Moderate to severe exacerbations (high and low risk subgroups), Outcome 6: HD TRIPLE vs MD TRIPLE

Triple therapy (ICS/LABA/LAMA) reduces moderate to severe exacerbations compared to dual therapy (ICS/LABA) only in the high‐risk subgroup (RR 0.84 [95% CI 0.77 to 0.92]; ARR 42 fewer per 1000 patients; [high certainty]) but not in the low‐risk subgroup (RR 0.96 [95% CI 0.77 to 1.20]; [moderate certainty] Analysis 7.7).

7.7. Analysis.

7.7

Comparison 7: Moderate to severe exacerbations (high and low risk subgroups), Outcome 7: TRIPLE vs DUAL

1.2.2 Individual treatments

For this outcome, 14 trials (13,127 participants) provided evidence as dichotomous data across 18 individual treatments. There were no studies that provided evidence as logHR data. A network diagram for the studies included in the NMA is presented in Figure 37. A summary of the studies included in the analysis is presented in Appendix 6. We added a continuity correction of 0.5 to the zero count events to help improve model convergence due to the sparsity of the evidence in Mansfield 2017.

37.

37

Network diagram for moderate to severe exacerbations for individual interventions.

Node colors denote the treatment group. The size of the nodes and the thickness of edges depend on the number of people randomised and the number of trials conducted. BDP: beclomethasone dipropionate, BUD:budesonide, FF:fluticasone furoate, FM:formoterol, FP:fluticasone propionate, GLY: glycopyrronium, IND:indacaterol, MF:mometasone furoate, SAL:salmeterol, UMEC: umeclidinium, VI:vilanterol

1.2.2. 1 Model selection and inconsistency checking

Model fit parameters for the fixed‐effect and random‐effects models are reported in Appendix 3. Both fixed‐effect and random‐effects models fit the data well. The between‐study heterogeneity was low, but the credible interval was wide. As the DIC for the fixed‐effect model was lower than for the random‐effects model, the fixed‐effect model was chosen. Results for the fixed‐effect model are presented in Section 1.2.2.2. There is no potential for inconsistency in this network as there is no independent, indirect evidence for any of the comparisons.

1.2.2.2 NMA results

Hazard ratios for moderate‐severe exacerbations in individual treatments, compared to FP/SAL 250/50 µg (MD‐ICS/LABA) are presented in Figure 38. The HRs for the comparison of all treatment groups against each other are reported in Table 31. The impact of the sparse evidence available for each comparison can be seen in the number of comparisons for which the HRs are extremely uncertain (highlighted in yellow in Table 31).

38.

38

Forest plot of hazard ratios relative to FP/SAL 250 for moderate to severe exacerbations for individual treatments. Hazard Ratios greater than one favor the comparator treatment over FP/SAL 250.

BUD:budesonide, CrI:Credible Interval; FF:fluticasone furoate, FM:formoterol, FP:fluticasone propionate, GLY: glycopyrronium, HR: hazard ratio; IND:indacaterol, MF:mometasone furoate, SAL:salmeterol, Tio:tiotropium, UMEC: umeclidinium, VI:vilanterol.

13. Hazard ratio for moderate to severe exacerbations for individual treatments (fixed‐effect model).
Comparison Median HR (95% CrI)
BUD/FM 320 vs. FP/SAL 250 0.93 (0.63, 1.39)
MF/FM 200 vs. FP/SAL 250 0.99 (0.53, 1.85)
FF/VI 100 vs. FP/SAL 250 0.83 (0.34, 1.88)
FP/FM 250 vs. FP/SAL 250 0.83 (0.27, 2.50)
MF/IND 160 vs. FP/SAL 250 6.13 (0.40, 4476)*
BDP/FM 200 vs. FP/SAL 250 0.29 (0.04, 1.23)
FP/SAL 200 vs. FP/SAL 250 9.04 (0.86, 8275)*
FP/SAL 500 vs. FP/SAL 250 6.92 (0.46, 5048)*
BUD/FM 640 vs. FP/SAL 250 0.79 (0.42, 1.55)
FF/VI 200 vs. FP/SAL 250 0.61 (0.24, 1.47)
MF/IND 320 vs. FP/SAL 250 5.04 (0.33, 3714)*
MF/GLY/IND 80 vs. FP/SAL 250 5.45 (0.36, 4034)*
FF/UMEC/VI 100 vs. FP/SAL 250 0.77 (0.31,1.86)
MF/GLY/IND 160 vs. FP/SAL 250 4.71 (0.31, 3491)*
BDP/FM/G 200 vs. FP/SAL 250 0.21 (0.03, 0.92)
FF/UMEC/VI 200 vs. FP/SAL 250 0.60 (0.23, 1.46)
FP/SAL 500 + Tio vs. FP/SAL 250 1.64 (0.00000, 747.40)*
MF/FM 200 vs. BUD/FM 320 1.06 (0.51, 2.23)
FF/VI 100 vs. BUD/FM 320 0.88 (0.34, 2.21)
FP/FM 250 vs. BUD/FM 320 0.89 (0.31, 2.49)
MF/IND 160 vs. BUD/FM 320 6.60 (0.41, 4954)*
BDP/FM 200 vs. BUD/FM 320 0.30 (0.05, 1.44)
FP/SAL 200 vs. BUD/FM 320 9.68 (0.89, 8950)*
FP/SAL 500 vs. BUD/FM 320 7.46 (0.47, 5555)*
BUD/FM 640 vs. BUD/FM 320 0.85 (0.51, 1.47)
FF/VI 200 vs. BUD/FM 320 0.65 (0.24, 1.72)
MF/IND 320 vs. BUD/FM 320 5.43 (0.34, 4094)*
MF/GLY/IND 80 vs. BUD/FM 320 5.87 (0.37 4445)*
FF/UMEC/VI 100 vs. BUD/FM 320 0.83 (0.30, 2.17)
MF/GLY/IND 160 vs. BUD/FM 320 5.08 (0.32, 3893)*
BDP/FM/G 200 vs. BUD/FM 320 0.22 (0.03, 1.07)
FF/UMEC/VI 200 vs. BUD/FM 320 0.64 (0.23, 1.69)
FP/SAL 500 + Tio vs. BUD/FM 320 1.75 (0.00000, 805.70)*
FF/VI 100 vs. MF/FM 200 0.82 (0.28, 2.33)
FP/FM 250 vs. MF/FM 200 0.83 (0.23, 2.98)
MF/IND 160 vs. MF/FM 200 6.22 (0.37, 4697)*
BDP/FM 200 vs. MF/FM 200 0.28 (0.04, 1.42)
FP/SAL 200 vs. MF/FM 200 9.14 (0.78, 8495)*
FP/SAL 500 vs. MF/FM 200 7.02 (0.42, 5303)*
BUD/FM 640 vs. MF/FM 200 0.80 (0.32, 1.99)
FF/VI 200 vs. MF/FM 200 0.61 (0.20, 1.80)
MF/IND 320 vs. MF/FM 200 5.11 (0.31, 3891)*
MF/GLY/IND 80 vs. MF/FM 200 5.52 (0.33, 4208)*
FF/UMEC/VI 100 vs. MF/FM 200 0.77 (0.26, 2.30)
MF/GLY/IND 160 vs. MF/FM 200 4.77 (0.28, 3694)*
BDP/FM/G 200 vs. MF/FM 200 0.21 (0.03, 1.06)
FF/UMEC/VI 200 vs. MF/FM 200 0.60 (0.20, 1.78)
FP/SAL 500 + Tio vs. MF/FM 200 1.64 (0.00000, 729.20)*
FP/FM 250 vs. FF/VI 100 1.02 (0.25, 4.06)
MF/IND 160 vs. FF/VI 100 7.62 (0.43, 6048.00)*
BDP/FM 200 vs. FF/VI 100 0.35 (0.04, 1.89)
FP/SAL 200 vs. FF/VI 100 11.28 (0.92, 10640)*
FP/SAL 500 vs. FF/VI 100 8.62 (0.49, 6794)*
BUD/FM 640 vs. FF/VI 100 0.97 (0.34, 2.90)
FF/VI 200 vs. FF/VI 100 0.74 (0.53, 1.03)
MF/IND 320 vs. FF/VI 100 6.29 (0.36, 5002)*
MF/GLY/IND 80 vs. FF/VI 100 6.78 (0.38, 5449)*
FF/UMEC/VI 100 vs. FF/VI 100 0.94 (0.68, 1.30)
MF/GLY/IND 160 vs. FF/VI 100 5.86 (0.33, 4673)*
BDP/FM/G 200 vs. FF/VI 100 0.26 (0.03, 1.41)
FF/UMEC/VI 200 vs. FF/VI 100 0.72 (0.51, 1.02)
FP/SAL 500 + Tio vs. FF/VI 100 1.98 (0.00000, 915.90)*
MF/IND 160 vs. FP/FM 250 7.65 (0.38, 6227)*
BDP/FM 200 vs. FP/FM 250 0.34 (0.04, 2.28)
FP/SAL 200 vs. FP/FM 250 11.22 (0.79, 10490)*
FP/SAL 500 vs. FP/FM 250 8.65 (0.44, 6995)*
BUD/FM 640 vs. FP/FM 250 0.96 (0.30, 3.16)
FF/VI 200 vs. FP/FM 250 0.73 (0.17, 3.13)
MF/IND 320 vs. FP/FM 250 6.30 (0.32, 5113)*
MF/GLY/IND 80 vs. FP/FM 250 6.79 (0.34, 5448)*
FF/UMEC/VI 100 vs. FP/FM 250 0.93 (0.23, 3.97)
MF/GLY/IND 160 vs. FP/FM 250 5.87 (0.30, 4851)*
BDP/FM/G 200 vs. FP/FM 250 0.25 (0.03, 1.69)
FF/UMEC/VI 200 vs. FP/FM 250 0.71 (0.17, 3.07)
FP/SAL 500 + Tio vs. FP/FM 250 1.97 (0.00000, 950.10)*
BDP/FM 200 vs. MF/IND 160 0.04 (0.0001, 1.06)
FP/SAL 200 vs. MF/IND 160 1.48 (0.38, 8.60)
FP/SAL 500 vs. MF/IND 160 1.13 (0.94, 1.36)
BUD/FM 640 vs. MF/IND 160 0.13 (0.0002, 2.20)
FF/VI 200 vs. MF/IND 160 0.10 (0.0001, 1.76)
MF/IND 320 vs. MF/IND 160 0.83 (0.68, 1.01)
MF/GLY/IND 80 vs. MF/IND 160 0.89 (0.72, 1.10)
FF/UMEC/VI 100 vs. MF/IND 160 0.12 (0.0002, 2.23)
MF/GLY/IND 160 vs. MF/IND 160 0.77 (0.62, 0.96)
BDP/FM/G 200 vs. MF/IND 160 0.03 (0.00004, 0.79)
FF/UMEC/VI 200 vs. MF/IND 160 0.09 (0.0001, 1.73)
FP/SAL 500 + Tio vs. MF/IND 160 0.37 (0.00000, 2.08)
FP/SAL 200 vs. BDP/FM 200 34.04 (1.97, 33480)*
FP/SAL 500 vs. BDP/FM 200 25.58 (1.08, 21010)*
BUD/FM 640 vs. BDP/FM 200 2.83 (0.55, 19.55)
FF/VI 200 vs. BDP/FM 200 2.13 (0.39, 17.16)
MF/IND 320 vs. BDP/FM 200 18.69 (0.78, 15450)*
MF/GLY/IND 80 vs. BDP/FM 200 20.17 (0.84, 16660)*
FF/UMEC/VI 100 vs. BDP/FM 200 2.70 (0.49, 21.82)
MF/GLY/IND 160 vs. BDP/FM 200 17.39 (0.72, 14470)*
BDP/FM/G 200 vs. BDP/FM 200 0.74 (0.56, 0.97)
FF/UMEC/VI 200 vs. BDP/FM 200 2.08 (0.38, 17.12)
FP/SAL 500 + Tio vs. BDP/FM 200 5.82 (0.00000, 3115)*
FP/SAL 500 vs. FP/SAL 200 0.76 (0.13, 2.92)
BUD/FM 640 vs. FP/SAL 200 0.09 (0.0001, 1.05)
FF/VI 200 vs. FP/SAL 200 0.07 (0.0001, 0.82)
MF/IND 320 vs. FP/SAL 200 0.56 (0.10, 2.16)
MF/GLY/IND 80 vs. FP/SAL 200 0.60 (0.10, 2.35)
FF/UMEC/VI 100 vs. FP/SAL 200 0.08 (0.0001, 1.04)
MF/GLY/IND 160 vs. FP/SAL 200 0.52 (0.09, 2.02)
BDP/FM/G 200 vs. FP/SAL 200 0.02 (0.00002, 0.38)
FF/UMEC/VI 200 vs. FP/SAL 200 0.06 (0.0001, 0.80)
FP/SAL 500 + Tio vs. FP/SAL 200 0.21 (0.00000, 2.30)
BUD/FM 640 vs. FP/SAL 500 0.11 (0.0002, 1.92)
FF/VI 200 vs. FP/SAL 500 0.09 (0.0001, 1.54)
MF/IND 320 vs. FP/SAL 500 0.73 (0.60, 0.89)
MF/GLY/IND 80 vs. FP/SAL 500 0.79 (0.64, 0.97)
FF/UMEC/VI 100 vs. FP/SAL 500 0.11 (0.0001, 1.95)
MF/GLY/IND 160 vs. FP/SAL 500 0.68 (0.55, 0.84)
BDP/FM/G 200 vs. FP/SAL 500 0.03 (0.00003, 0.69)
FF/UMEC/VI 200 vs. FP/SAL 500 0.08 (0.0001, 1.51)
FP/SAL 500 + Tio vs. FP/SAL 500 0.33 (0.00000, 1.84)
FF/VI 200 vs. BUD/FM 640 0.76 (0.25, 2.29)
MF/IND 320 vs. BUD/FM 640 6.42 (0.38, 5053)*
MF/GLY/IND 80 vs. BUD/FM 640 6.95 (0.40, 5493)*
FF/UMEC/VI 100 vs. BUD/FM 640 0.97 (0.31, 2.92)
MF/GLY/IND 160 vs. BUD/FM 640 6.00 (0.35, 4786)*
BDP/FM/G 200 vs. BUD/FM 640 0.26 (0.04, 1.37)
FF/UMEC/VI 200 vs. BUD/FM 640 0.75 (0.24, 2.24)
FP/SAL 500 + Tio vs. BUD/FM 640 2.04 (0.00000, 958.30)*
MF/IND 320 vs. FF/VI 200 8.53 (0.47, 6736)*
MF/GLY/IND 80 vs. FF/VI 200 9.18 (0.51, 7364)*
FF/UMEC/VI 100 vs. FF/VI 200 1.27 (0.90, 1.80)
MF/GLY/IND 160 vs. FF/VI 200 7.95 (0.44, 6432)*
BDP/FM/G 200 vs. FF/VI 200 0.34 (0.04, 1.92)
FF/UMEC/VI 200 vs. FF/VI 200 0.98 (0.68, 1.41)
FP/SAL 500 + Tio vs. FF/VI 200 2.68 (0.00000, 1223)*
MF/GLY/IND 80 vs. MF/IND 320 1.08 (0.86, 1.35)
FF/UMEC/VI 100 vs. MF/IND 320 0.15 (0.0002, 2.69)
MF/GLY/IND 160 vs. MF/IND 320 0.93 (0.74, 1.17)
BDP/FM/G 200 vs. MF/IND 320 0.04 (0.0001, 0.94)
FF/UMEC/VI 200 vs. MF/IND 320 0.11 (0.0001, 2.09)
FP/SAL 500 + Tio vs. MF/IND 320 0.45 (0.00000, 2.53)
FF/UMEC/VI 100 vs. MF/GLY/IND 80 0.14 (0.0002, 2.50)
MF/GLY/IND 160 vs. MF/GLY/IND 80 0.86 (0.69, 1.09)
BDP/FM/G 200 vs. MF/GLY/IND 80 0.04 (0.00004, 0.88)
FF/UMEC/VI 200 vs. MF/GLY/IND 80 0.11 (0.0001, 1.95)
FP/SAL 500 + Tio vs. MF/GLY/IND 80 0.41 (0.00000, 2.33)
MF/GLY/IND 160 vs. FF/UMEC/VI 100 6.25 (0.35, 4959)*
BDP/FM/G 200 vs. FF/UMEC/VI 100 0.27 (0.03, 1.52)
FF/UMEC/VI 200 vs. FF/UMEC/VI 100 0.77 (0.54, 1.10)
FP/SAL 500 + Tio vs. FF/UMEC/VI 100 2.12 (0.00000, 969)*
BDP/FM/G 200 vs. MF/GLY/IND 160 0.04 (0.0001, 1.03)
FF/UMEC/VI 200 vs. MF/GLY/IND 160 0.12 (0.0002, 2.26)
FP/SAL 500 + Tio vs. MF/GLY/IND 160 0.48 (0.00000, 2.70)
FF/UMEC/VI 200 vs. BDP/FM/G 200 2.82 (0.50, 23.33)
FP/SAL 500 + Tio vs. BDP/FM/G 200 7.86 (0.00000, 4308)*
FP/SAL 500 + Tio vs. FF/UMEC/VI 200 2.74 (0.00000, 1260)*

The second named treatment is the baseline intervention. Hazard Ratio less than one favours the first named treatment. Treatment comparisons in bold do not include the “null” effect. *HRs are extremely uncertain due to network sparsity and should be treated with caution. Abbreviations: BUD=budesonide, CrI= credible interval, FF=fluticasone furoate, FM=formoterol, FP=fluticasone propionate, GLY= glycopyrronium, HR=hazard ratio, IND=indacaterol, MF=mometasone furoate, SAL=salmeterol, Tio=tiotropium, UMEC= umeclidinium, VI=vilanterol.

The rank plots for individual treatments are presented in Figure 39, and the mean and median ranks with their corresponding 95% CrIs are presented in Table 32. Beclomethasone dipropionate/formoterol/glycopyrronium (BDP/FM/GLY) 200/12/20 µg (MD Triple) has the highest probability of being the best treatment, but overall, treatment ranks are very uncertain, and most treatments have probabilities less than 50% for all ranks.

39.

39

Rank plots for individual treatments for moderate to severe exacerbations (fixed effect model)

Line colors denote the treatment group. BUD:budesonide, FF:fluticasone furoate, FM:formoterol, FP:fluticasone propionate, GLY: glycopyrronium, IND:indacaterol, MF:mometasone furoate, SAL:salmeterol, Tio:tiotropium, UMEC: umeclidinium, VI:vilanterol.

14. Mean and median ranking for individual treatments for moderate to severe exacerbations (fixed‐effect model).
Treatments Mean Rank Median Rank 95% CrI
BDP/FM/G 200 1.96 1.0 (1.0, 9.0)
BDP/FM 200 3.51 2.0 (2.0, 11.0)
FF/UMEC/VI 200 5.03 4.0 (1.0, 12.0)
FF/VI 200 5.24 5.0 (1.0, 12.0)
BUD/FM 640 7.42 7.0 (2.0, 16.0)
FF/UMEC/VI 100 7.78 7.0 (3.0, 16.0)
FP/FM 250 7.87 8.0 (1.0, 17.0)
FF/VI 100 8.44 8.0 (4.0, 16.0)
BUD/FM 320 8.91 9.0 (4.0, 16.0)
FP/SAL 500 + Tio 9.00 12.0 (1.0, 18.0)
MF/FM 200 9.32 10.0 (3.0, 17.0)
FP/SAL 250 9.65 10.0 (5.0, 16.0)
MF/GLY/IND 160 12.14 13.0 (3.0, 15.0)
MF/IND 320 12.92 14.0 (4.0, 16.0)
MF/GLY/IND 80 13.87 15.0 (5.0, 17.0)
MF/IND 160 15.21 16.0 (7.0, 18.0)
FP/SAL 200 16.32 18.0 (11.0, 18.0)
FP/SAL 500 16.41 17.0 (8.0, 18.0)

BUD=budesonide, FF=fluticasone furoate, FM=formoterol, FP=fluticasone propionate, GLY= glycopyrronium, IND=indacaterol, MF=mometasone furoate, SAL=salmeterol, UMEC= umeclidinium, VI=vilanterol.

2.  Secondary, continuous outcomes

2.1 Asthma Control Questionnaire (ACQ) score
2.1.1 Change from baseline at three months
2.1.1.1 Grouped treatments

For this outcome, 4 trials (4529 participants) comparing four treatment groups were included in the NMA (Figure 3). A summary of the studies included in the analysis is presented in Appendix 7.

2.1.1.1.1 Model selection and inconsistency checking

Model fit parameters for the fixed‐effect and random‐effects models are reported in Appendix 3. Both fixed‐effect and random‐effects models fit the data well. The between‐study heterogeneity was low. As the difference in DICs between the fixed‐effect and random‐effects models was less than 3, the simpler fixed‐effect model was chosen. Results for the fixed‐effect model are presented in Section 2.1.1.1.2. There is no potential for inconsistency in this network as there is no independent, indirect evidence for any of the comparisons.

2.1.1.1.2 NMA results

Mean differences in CFB in ACQ scores at three months are presented in Figure 40. The mean differences in CFB in ACQ scores at three months comparing all treatment groups against each other are reported in Table 33.

40.

40

Forest plot of relative effects for the change from baseline ACQ score at 3 months using the fixed effect model.

Mean differences less than zero favor the first named treatment. CrI:Credible Interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: mean difference; MD: medium dose.

15. Mean difference for change from baseline in ACQ scores at 3 months.
Comparison Median Mean Difference (95% CrI)
HD‐ICS/LABA vs MD‐ICS/LABA 0.008 (‐0.053, 0.069)
MD Triple vs. MD‐ICS/LABA ‐0.056 (‐0.141, 0.029)
HD Triple vs MD‐ICS/LABA ‐0.094 (‐0.178,‐0.011)
MD Triple vs. HD‐ICS/LABA ‐0.064 (‐0.149, 0.022)
HD Triple vs HD‐ICS/LABA ‐0.103 (‐0.187, ‐0.018)
HD Triple vs MD Triple ‐0.039 (‐0.111, 0.034)

Mean difference less than zero favours the first named treatment. Treatment comparisons in bold do not include the “null” effect. CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

There is evidence to suggest that HD Triple reduces the ACQ score at three months compared to HD‐ICS/LABA (mean difference ‐0.09 [95% CrI ‐0.18 to ‐0.01]). However, this difference does not satisfy the minimal clinically important difference (MCID) of 0.5 (Juniper 2005). An NMA summary of findings is presented in Table 4

The rank plots for grouped treatments are presented in Figure 41, and the mean and median ranks are presented in Table 34. HD Triple ranks higher than the other treatments (median rank 1 [95% CrI 1 to 2]). All other treatment ranks display wide credible intervals, reflecting high uncertainty in treatment rankings.

41.

41

Rank plots for grouped treatments for change from baseline in ACQ scores at 3 months (fixed effect model).

HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose

16. Mean and median ranking for change from baseline in ACQ scores at 3 months sorted by mean rank (fixed‐effect model).
Treatments Mean Rank Median Rank 95% CrI
HD Triple 1.17 1 (1.00, 2.00)
MD Triple 2.02 2 (1.00, 4.00)
MD‐ICS/LABA 3.28 3 (2.00, 4.00)
HD‐ICS/LABA 3.52 4 (2.00, 4.00)

CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

2.1.2 Change from baseline at six months
2.1.2.1 Grouped treatments

For this outcome, 6 trials (7957 participants) comparing four treatment groups were included in the NMA (Figure 4). A summary of the studies included in the analysis is presented in Appendix 8.

2.1.2.1.1 Model selection and inconsistency checking

Model fit parameters for the fixed‐effect and random‐effects models are reported in Appendix 3. Both fixed‐effect and random‐effects models fit the data well. The between‐study heterogeneity was low. As the difference in DICs between the fixed‐effect and random‐effects models was less than 3, the simpler fixed‐effect model was chosen.

A node‐splitting model was fit to assess inconsistency. The results of node‐splitting are presented in Table 35. There was no evidence to suggest any inconsistency in the model.

17. Node‐splitting results for change from baseline in ACQ scores at 6 months.
Model p Mean Difference
(95% CrI)
MD Triple vs. MD‐ICS/LABA
Direct 0.472 ‐0.092
(‐0.231, 0.047)
Indirect 0.003
(‐0.302, 0.283)
Network ‐0.071
(‐0.173, 0.026)
HD Triple vs. MD‐ICS/LABA
Direct 0.733 ‐0.108
(‐0.229, 0.016)
Indirect ‐0.075
(‐0.295, 0.128)
Network ‐0.103
(‐0.204, ‐0.015)
MD Triple vs. HD‐ICS/LABA
Direct 0.266 ‐0.007
(‐0.115, 0.101)
Indirect ‐0.121
(‐0.323, 0.077)
Network ‐0.038
(‐0.135, 0.050)

Mean difference less than zero favours the first named treatment. CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

2.1.2.1.2 NMA results

The mean difference in CFB in ACQ scores at six months are presented in Figure 42. The mean difference in CFB in ACQ scores at six months comparing all treatment groups against each other are reported in Table 36.

42.

42

Forest plot of relative effects for the change from baseline in ACQ score at 6 months using fixed‐ and random‐effects models.

Mean differences less than zero favor the first named treatment. CrI:Credible Interval; FE: fixed effect; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: mean difference; MD: medium dose; RE: random effects.

18. Mean difference for change from baseline in ACQ scores at 6 months.
Comparison Median Mean Difference (95% CrI)
HD‐ICS/LABA vs MD‐ICS/LABA ‐0.033 (‐0.086, 0.019)
MD Triple vs. MD‐ICS/LABA ‐0.066 (‐0.134, 0.001)
HD Triple vs MD‐ICS/LABA ‐0.098 (‐0.161, ‐0.034)
MD Triple vs. HD‐ICS/LABA ‐0.033 (‐0.095, 0.029)
HD Triple vs HD‐ICS/LABA ‐0.064 (‐0.121, ‐0.008)
HD Triple vs MD Triple ‐0.031 (‐0.092, 0.029)

Mean difference less than zero favours the first named treatment. Treatment comparisons in bold do not include the “null” effect. CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

There is evidence to suggest that HD Triple reduces the ACQ score at six months compared to MD‐ICS/LABA and HD‐ICS/LABA (mean difference ‐0.10 [95% CrI ‐0.16 to ‐0.03] and ‐0.06 [‐0.12 to ‐0.01], respectively). However, these differences do not satisfy the MCID of 0.5 (Juniper 2005). An NMA summary of findings is presented in Table 5

The rank plots for grouped treatments are presented in Figure 43, and the mean and median ranks are presented in Table 37. HD Triple ranks higher than the other three grouped treatments (median rank 1 [95% CrI 1 to 2]).

43.

43

Rank plots for grouped treatments for change from baseline in ACQ scores at 6 months for the fixed effect (A) and random effects (B) models.

HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

19. Mean and median ranking for change from baseline in ACQ scores at 6 months sorted by mean rank (fixed effect model).
Treatments Mean Rank Median Rank 95% CrI
HD Triple 1.17 1 (1.00, 2.00)
MD Triple 2.02 2 (1.00, 3.00)
HD‐ICS/LABA 2.95 3 (2.00, 4.00)
MD‐ICS/LABA 3.86 4 (3.00, 4.00)

CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

2.1.3 Change from baseline at 12 months
2.1.3.1 Grouped treatments

For this outcome, 5 trials (5440 participants) comparing 4 treatment groups were included in the NMA (Figure 5). A summary of the studies included in the analysis is presented in Appendix 9.

2.1.3.1.1 Model selection and inconsistency checking

Model fit parameters for the fixed‐effect and random‐effects models are reported in Appendix 3. Both fixed‐effect and random‐effects models fit the data well. The between‐study heterogeneity was low. As the difference in DICs between the fixed‐effect and random‐effects models was less than 3, the simpler fixed‐effect model was chosen. Results for the fixed‐effect model are presented in Section 2.1.3.1.2. A node‐splitting model was fit to assess inconsistency. The results of node‐splitting are presented in Table 38. There was no evidence to suggest inconsistency in the network.

20. Node‐splitting results for change from baseline in ACQ scores at 12 months.
Model p Mean Difference
(95% CrI)
HD Triple vs. MD‐ICS/LABA
Direct 0.946 ‐0.090
(‐0.237, 0.074)
Indirect ‐0.080
(‐0.335, 0.178)
Network ‐0.082
(‐0.204, 0.042)

Mean differences less than zero favour the first named treatment. CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

2.1.3.1.2 NMA results

Mean differences in CFB in ACQ scores at 12 months are presented in Figure 44. The mean differences in CFB in ACQ scores at 12 months comparing all treatment groups against each other are reported in Table 39. There is evidence to suggest that there is a change in ACQ scores at 12 months for HD Triple compared to HD‐ICS/LABA and MD Triple (mean difference ‐0.08 [95% CrI ‐0.15 to ‐0.01] and ‐0.10 [‐0.20 to ‐0.01], respectively). However, none of these differences reach the MCID of 0.5 (Juniper 2005). An NMA summary of findings is presented in Table 6.

44.

44

Forest plot of mean differences for change from baseline in ACQ scores at 12 months using the fixed effect model.

Mean differences less than zero favor the first named treatment. CrI: Credible Interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: mean difference; MD: medium dose.

21. Mean difference for change from baseline in ACQ scores at 12 months (fixed‐effect model).
Comparison Median Mean Difference (95% CrI)
HD‐ICS/LABA vs MD‐ICS/LABA ‐0.003 (‐0.063, 0.057)
MD Triple vs. MD‐ICS/LABA 0.024 (‐0.066, 0.114)
HD Triple vs MD‐ICS/LABA ‐0.081 (‐0.162, 0.001)
MD Triple vs. HD‐ICS/LABA 0.027 (‐0.056, 0.111)
HD Triple vs HD‐ICS/LABA ‐0.077 (‐0.148, ‐0.007)
HD Triple vs MD Triple ‐0.105 (‐0.199, ‐0.011)

Mean difference less than zero favours the first named treatment. Treatment comparisons in bold do not include the “null” effect. CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

The rank plots for grouped treatments are presented in Figure 45, and the mean ranks are presented in Table 40. HD Triple ranks higher than the other treatments (median rank 1 [95%CrI 1 to 2]). All other treatment ranks display wide credible intervals, reflecting high uncertainty in treatment rankings.

45.

45

Rank plots for grouped treatments for change from baseline in ACQ scores at 12 months (fixed effect model) HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

22. Mean and median ranks for change from baseline in ACQ scores at 12 months sorted by mean rank (fixed‐effect model).
Treatments Mean Rank Median Rank 95% CrI
HD Triple 1.06 1.0 (1.00, 2.00)
HD‐ICS/LABA 2.70 3.0 (2.00, 4.00)
MD‐ICS/LABA 2.82 3.0 (2.00, 4.00)
MD Triple 3.43 4.0 (2.00, 4.00)

CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

2.1.4 Pairwise meta‐analysis
2.1.4.1 Change from baseline in ACQ scores at three, six, and 12 months

There is insufficient evidence to suggest that there is a clinically meaningful change in ACQ scores (MCID 0.5) at three, six, and 12 months for any of the treatment comparisons (Analysis 2.1Analysis 2.2, and Analysis 2.3). The results were unchanged when Lee 2020,which is considered at high risk of bias due to high attrition rates, was removed in CFB in ACQ scores at 12 months. The certainty of evidence ranges from low to moderate (Table 7). There was no difference in the results between fixed‐effect and random‐effects models. Above results are qualitatively similar to those of the NMA.

2.1. Analysis.

2.1

Comparison 2: Asthma Control Questionnaire: change from baseline, Outcome 1: CFB in ACQ at 3 months

2.2. Analysis.

2.2

Comparison 2: Asthma Control Questionnaire: change from baseline, Outcome 2: CFB in ACQ at 6 months

2.3. Analysis.

2.3

Comparison 2: Asthma Control Questionnaire: change from baseline, Outcome 3: CFB in ACQ at 12 months

2.2 Asthma Quality of Life Questionnaire (AQLQ) score
2.2.1 Change from baseline at six months
2.2.1.1 Grouped treatments

For this outcome, 4 trials (3556 participants) comparing four treatment groups were included in the NMA (Figure 6). A summary of the studies included in the analysis is presented in Appendix 10.

2.2.1.1.1 Model selection and inconsistency checking

Model fit parameters for the fixed‐effect and random‐effects models are reported in Appendix 3. Both fixed‐effect‐ and random‐effects models fit the data well. The between‐study heterogeneity was low. As the difference in DICs between the fixed‐effect‐ and random‐effects models was less than 3, the simpler fixed‐effect model was chosen. Results for the fixed‐effect model are presented in Section 2.2.1.1.2. There is no potential for inconsistency in this network as there is no independent, indirect evidence for any of the comparisons.

2.2.1.1.2 NMA results

Mean differences in CFB in AQLQ scores at six months are presented in Figure 46. The mean differences in CFB in AQLQ scores at six months comparing all treatment groups against each other are reported in Table 41. There is insufficient evidence to suggest that there is a change in AQLQ scores at six months for any of the treatment comparisons. An NMA summary of findings is presented in Table 8.

46.

46

Forest plot of mean differences for change from baseline in AQLQ scores at 6 months using the fixed effect model.

Mean differences less than zero favor the first named treatment. CrI: Credible Interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: mean difference; MD: medium dose.

23. Mean difference for change from baseline in AQLQ scores at 6 months (fixed‐effect model).
Comparison Median Mean Difference (95% CrI)
HD‐ICS/LABA vs MD‐ICS/LABA ‐0.056 (‐0.138, 0.026)
MD Triple vs. MD‐ICS/LABA 0.028 (‐0.229, 0.287)
HD Triple vs MD‐ICS/LABA 0.108 (‐0.088, 0.304)
MD Triple vs. HD‐ICS/LABA 0.084 (‐0.159, 0.330)
HD Triple vs HD‐ICS/LABA 0.164 (‐0.013, 0.342)
HD Triple vs MD Triple 0.080 (‐0.088, 0.247)

Mean difference less than zero favours the first named treatment. CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

The rank plots for grouped treatments are presented in Figure 47, and the mean and median ranks are presented in Table 42. HD Triple ranks the highest of all the grouped treatments (median rank 1 [95% CrI 1 to 3]). All other treatment ranks display wide credible intervals, reflecting high uncertainty in treatment rankings.

47.

47

Rank plots for grouped treatments for change from baseline in AQLQ scores at 6 months (fixed effect model)

HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

24. Mean and median ranking for change from baseline in AQLQ scores at 6 months sorted by mean rank (fixed‐effect model).
Treatments Mean Rank Median Rank 95% CrI
HD Triple 1.35 1.00 (1.00, 3.00)
MD Triple 2.49 2.00 (1.00, 4.00)
MD‐ICS/LABA 2.54 3.00 (1.00, 4.00)
HD‐ICS/LABA 3.63 4.00 (2.00, 4.00)

CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

2.2.2 Change from baseline at 12 months
2.2.2.1 Grouped treatments

For this outcome, 4 trials (4809 participants) comparing four treatment groups were included in the NMA (Figure 7). A summary of the studies included in the analysis is presented in Appendix 11.

2.2.2.1.1 Model selection and inconsistency checking

Model fit parameters for the fixed‐effect and random‐effects models are reported in Appendix 3. Both fixed‐effect and random‐effects models fit the data well. The between‐study heterogeneity was low. As the difference in DICs between the fixed‐effect and random‐effects models was less than 3, the simpler fixed‐effect model was chosen. Results for the fixed‐effect model are presented in Section 2.2.2.1.2. A node‐splitting model was fit to assess inconsistency in the model. The results of node‐splitting are presented in Table 43. There was no evidence to suggest inconsistency in the network.

25. Node‐splitting results for CFB in AQLQ scores at 12 months.
Model p Mean Difference
(95% CrI)
HD Triple vs. MD‐ICS/LABA
Direct 0.944 0.060
(‐0.247, 0.362)
Indirect 0.073
(‐0.324, 0.471)
Network 0.053
(‐0.126, 0.258)

Mean differences less than zero favour the first named treatment. CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

2.2.2.1.2 NMA results

Mean differences in CFB in AQLQ scores at 12 months are presented in Figure 48. The mean differences in CFB in AQLQ scores at 12 months comparing all treatment groups against each other are reported in Table 44.

48.

48

Forest plot of mean differences for change from baseline in AQLQ scores at 12 months using the fixed effect model.

Mean differences less than zero favor the first named treatment. CrI: Credible Interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: mean difference; MD: medium dose.

26. Mean difference for change from baseline in AQLQ scores at 12 months (fixed‐effect model).
Comparison Median Mean Difference (95% CrI)
HD‐ICS/LABA vs MD‐ICS/LABA ‐0.024 (‐0.087, 0.039)
MD Triple vs. MD‐ICS/LABA ‐0.076 (‐0.167, 0.016)
HD Triple vs MD‐ICS/LABA 0.045 (‐0.041, 0.131)
MD Triple vs. HD‐ICS/LABA ‐0.052 (‐0.135, 0.032)
HD Triple vs HD‐ICS/LABA 0.069 (‐0.006, 0.144)
HD Triple vs MD Triple 0.121 (0.025, 0.216)

Mean difference less than zero favours the first named treatment. Treatment comparisons in bold do not include the “null” effect. CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

There is evidence to suggest that there is a change in AQLQ scores at 12 months for HD Triple compared to MD Triple (MD 0.12 [95% CrI 0.02 to 0.22]). However, this difference does not reach the MCID of 0.5 (Juniper 1994). An NMA summary of findings is presented in Table 9.

The rank plots for grouped treatments are presented in Figure 49, and the mean and median ranks are presented in Table 45. HD Triple ranks the highest of all the grouped treatments (median rank 1 [95% CrI 1 to 3]), but credible intervals for treatment ranks are wide.

49.

49

Rank plots for grouped treatments for change from baseline in AQLQ scores at 12 months (fixed effect model)

HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

27. Mean and median ranking for change from baseline in AQLQ scores at 12 months sorted by mean rank (fixed‐effect model).
Treatments Mean Rank Median Rank 95% CrI
HD Triple 1.20 1 (1.00, 3.00)
MD‐ICS/LABA 2.12 2 (1.00, 4.00)
HD‐ICS/LABA 2.85 3 (2.00, 4.00)
MD Triple 3.83 4 (2.00, 4.00)

CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

2.2.3 Pairwise meta‐analysis
2.2.3. 1 change from baseline in AQLQ scores at six and 12 months

There is insufficient evidence to suggest that there is a clinically meaningful change in AQLQ scores (MCID 0.5) at six or 12 months for any of the treatment comparisons (Analysis 3.1 and Analysis 3.2). The certainty of evidence ranges from low to moderate (Table 10). There was no difference in the results between fixed‐effect and random‐effects models. Above results are similar to those of the NMA.

3.1. Analysis.

3.1

Comparison 3: Asthma Quality of Life Questionnaire: change from baseline, Outcome 1: CFB in AQLQ at 6 months

3.2. Analysis.

3.2

Comparison 3: Asthma Quality of Life Questionnaire: change from baseline, Outcome 2: CFB in AQLQ at 12 months

3. Secondary, dichotomous outcomes

3.1 Asthma Control Questionnaire (ACQ) responders
3.1.1 ACQ responders at six months.
3.1.1.1 Grouped treatments

For this outcome, 7 trials (10,453 participants) comparing four treatment groups were included in the NMA (Figure 8). A summary of the studies included in the analysis is presented in Appendix 12.

3.1.1.1.1 Model selection and inconsistency checking

The Turner prior comparing pharmacological interventions for subjective outcomes, i.e. a Log‐Normal (‐2.93, 1.582) prior distribution, was used for the between‐study heterogeneity (Turner 2015).

Model fit parameters for the fixed‐effect and random‐effects models are reported in Appendix 3. Both fixed‐effect and random‐effects models fit the data well. The between‐study heterogeneity was low. As the difference in DICs between the fixed‐effect and random‐effects models was less than 3, the simpler fixed‐effect model was chosen. Results for the fixed‐effect model are presented in Section 3.1.1.1.2.

A node‐splitting model was fit to assess inconsistency. The results of node‐splitting are presented in Table 46. There was no evidence to suggest inconsistency in the network.

28. Node‐splitting results for ACQ responders at 6 months for grouped treatments.
Model p LORs
(95% CrI)
HD‐ICS/LABA vs. MD‐ICS/LABA
Direct 0.360 0.080
(‐0.142, 0.306)
Indirect ‐0.14
(‐0.664, 0.373)
Network 0.046
(‐0.150, 0.236)
MD Triple vs. MD‐ICS/LABA
Direct 0.402 0.207
(‐0.026, 0.441)
Indirect 0.472
(‐0.167, 1.117)
Network 0.228
(0.028, 0.432)
HD Triple vs. MD‐ICS/LABA
Direct 0.720 0.247
(‐0.114, 0.612)
Indirect 0.156
(‐0.327, 0.620)
Network 0.216
(0.005, 0.425)
MD Triple vs. HD‐ICS/LABA
Direct 0.267 0.089
(‐0.218, 0.408)
Indirect 0.343
(‐0.058, 0.781)
Network 0.183
(‐0.020, 0.394)
HD Triple vs. HD‐ICS/LABA
Direct 0.391 0.185
(‐0.006, 0.383)
Indirect ‐0.077
(‐0.718, 0.584)
Network 0.172
(‐0.001, 0.343)
HD Triple vs. MD Triple
Direct 0.359 ‐0.061
(‐0.305, 0.171)
Indirect 0.158
(‐0.339, 0.672)
Network ‐0.011
(‐0.222, 0.188)

CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; LOR: log odds ratio; MD: medium dose.

3.1.1.1.2 NMA results

The odds ratios of ACQ responders at six months are presented in Figure 50. The odds ratios of ACQ responders at six months comparing all treatment groups against each other are reported in Table 47.

50.

50

Forest plot of odds ratios relative for ACQ responders at 6 months for grouped treatments.

Odds ratio greater than one favors the first named treatment. CrI: Credible Interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

29. Odds ratio for ACQ responders at 6 months (fixed‐effect model).
Comparison Odds Ratio (95% CrI)
HD‐ICS/LABA vs MD‐ICS/LABA 1.052 (0.919, 1.203)
MD Triple vs. MD‐ICS/LABA 1.248 (1.086, 1.437)
HD Triple vs MD‐ICS/LABA 1.246 (1.073, 1.446)
MD Triple vs. HD‐ICS/LABA 1.187 (1.030, 1.370)
HD Triple vs HD‐ICS/LABA 1.184 (1.054, 1.331)
HD Triple vs MD Triple 0.998 (0.861, 1.155)

The second named treatment is the baseline intervention. Odds ratio greater than one favours the first named treatment.Treatment comparisons in bold do not include the “null” effect. CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

There is evidence to suggest that MD Triple and HD Triple increase the odds of patient response compared to MD‐ICS/LABA (OR 1.25 [95% CrI 1.09 to 1.44] and 1.25 [1.07 to 1.45]) and HD‐ICS/LABA (OR 1.19 [95% CrI 1.03 to 1.37] and 1.18 [1.05 to 1.33]). An NMA summary of findings is presented in Table 11.

The rank plots for grouped treatments are presented in Figure 51, and the mean and median ranks are presented in Table 48. MD Triple and HD Triple rank higher than the other treatments (median rank 1 [95% CrI 1 to 2] and 2 [1 to 2], respectively). However, it is difficult to differentiate between MD Triple and HD Triple, and MD‐ICS/LABA and HD‐ICS/LABA in terms of treatment ranks.

51.

51

Rank plots for grouped treatments for ACQ responders at 6 months (fixed effect model)

HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

30. Mean and median ranking for grouped treatments for ACQ responders at 6 months sorted by mean rank (fixed‐effect model).
Treatments Mean Rank Median Rank 95% CrI
MD Triple 1.50 1 (1.00, 2.00)
HD Triple 1.52 2 (1.00, 2.00)
HD‐ICS/LABA 3.22 3 (3.00, 4.00)
MD‐ICS/LABA 3.77 4 (3.00, 4.00)

CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

3.1.1.1.3 Pairwise meta‐analysis

Results of pairwise meta‐analysis are presented in Analysis 4.1 and Table 13). The evidence suggests that HD and MD Triple increase ACQ responders at six months compared to MD‐ICS/LABA (RR 1.11 [95% CI 0.91 to 1.35]; absolute benefit increase (ABI) 69 more per 1000 patients; [very low certainty] and RR 1.09 [95% CI 0.99 to 1.19]; ABI 52 more per 1000 patients; [low certainty], respectively).

4.1. Analysis.

4.1

Comparison 4: Asthma Control Questionnaire responders, Outcome 1: ACQ responders at 6 months

There is evidence to suggest that triple therapy (ICS/LABA/LAMA) increases ACQ responders at six months compared to dual therapy (ICS/LABA) (RR1.09 [95% CI 1.02 to 1.15]; ABI 54 more per 1000 patients; [low certainty]).

The results were unchanged when van Zyl‐Smit 2020, which is considered at high risk of bias due to high attrition rates, was removed. There was no difference in the results between fixed‐effect and random‐effects models.

3.1.1.2 Individual treatments

For this outcome, 3 trials (5380 participants) comparing six distinct treatments were included in the NMA (Figure 52). A summary of the studies included is presented in Appendix 13. Three studies (Kerstjens 2012Lee 2020, and Virchow 2019a) that were identified were excluded from this analysis, as they were disconnected from the main network shown in Figure 52.

52.

52

Network diagram for ACQ responders at 6 months for individual interventions.

Node colors denote the treatment group. The size of the nodes and the thickness of edges depend on the number of people randomised and the number of trials conducted. FP:fluticasone propionate, GLY: glycopyrronium, IND:indacaterol, MF:mometasone furoate, SAL:salmeterol, Tio:tiotropium.

3.1.1.2.1 Model selection and inconsistency checking

The Turner prior comparing pharmacological interventions for subjective outcomes, i.e. a Log‐Normal (‐2.93, 1.582) prior distribution, was used for the between‐study heterogeneity (Turner 2015).

Model fit parameters for the fixed‐effect and random‐effects models are reported in Appendix 3. Both fixed‐effect and random‐effects models fit the data well. The between‐study heterogeneity was low. As the difference in DICs between the fixed‐effect and random‐effects models was less than 3, the simpler fixed‐effect model was chosen. Results for the fixed‐effect model are presented in Section 3.1.1.2.2. There is no potential for inconsistency in this network as there is no independent, indirect evidence for any of the comparisons.

3.1.1.2.2 NMA results

The odds ratios of ACQ responders at six months, compared to mometasone furoate/indacaterol (MF/IND)160/150 µg (MD‐ICS/LABA), are presented in Figure 53. The odds ratios of ACQ responders at six months comparing all treatment groups against each other are reported in Table 49.

53.

53

Forest plot of odds ratios relative to MF/IND160 for ACQ responders at 6 months for individual treatments.

Odds ratio greater than one favors the comparator treatment over MF/IND 160. CrI: credible interval, FP:fluticasone propionate, GLY: glycopyrronium, IND:indacaterol, MF:mometasone furoate, SAL:salmeterol, Tio:tiotropium.

31. Odds ratio for ACQ responders at 6 months for individual treatments (fixed‐effect model).
Comparison Odds Ratio (95% CrI)
FP/SAL 500 vs. MF/IND 160 0.935 (0.785,1.114)
MF/IND 320 vs. MF/IND 160 0.860 (0.677,1.097)
MF/GLY/IND 80 vs. MF/IND 160 1.140 (0.957,1.360)
MF/GLY/IND 160 vs. MF/IND 160 1.241 (0.974,1.581)
FP/SAL 500 + Tio vs. MF/IND 160 0.919 (0.732,1.157)
MF/IND 320 vs. FP/SAL 500 1.220 (0.998,1.491)
MF/GLY/IND 80 vs. FP/SAL500 1.327 (1.124,1.568)
MF/GLY/IND 160 vs. FP/SAL 500 1.326 (1.029,1.704)
FP/SAL 500 + Tio vs. FP/SAL 500 1.443 (1.087,1.913)
MF/GLY/IND 80 vs. MF/IND 320 1.088 (0.838,1.412)
MF/GLY/IND 160 vs. MF/IND 320 0.935 (0.785,1.114)
FP/SAL 500 + Tio vs. MF/IND 320 0.860 (0.677,1.097)
MF/GLY/IND 160 vs. MF/GLY/IND 80 1.140 (0.957,1.360)
FP/SAL 500 + Tio vs. MF/GLY/IND 80 1.241 (0.974,1.581)
FP/SAL 500 + Tio vs. MF/GLY/IND 160 0.919 (0.732,1.157)

The second named treatment is the baseline intervention. Odds ratio greater than one favours the treatment named first in the comparisons. Treatment comparisons in bold do not include the “null” effect. CrI=credible interval, FP=fluticasone propionate, GLY= glycopyrronium, IND=indacaterol, MF=mometasone furoate, SAL=salmeterol, Tio=tiotropium.

There is no evidence to suggest that there is a change in odds of ACQ responders at six months for any individual treatments compared to MF/IND 160/150 µg (MD‐ICS/LABA), but there was evidence to suggest that LD and MD triple therapies with mometasone furoate/glycopyrronium/indacaterol (80/50/150 µg and160/50/150 µg) and FP/SAL 500/50 µg plus tiotropium 5 µg (HD Triple) increase the odds of ACQ responders compared to FP/SAL 500/50 µg (HD‐ICS/LABA).

The rank plots for individual treatments are presented in Figure 54, and the mean and median ranks are presented in Table 50. MF/IND 320/150 µg (HD‐ICS/LABA) has the highest probability of being better than the other individual treatments (median rank 1 [95% CrI,1 to 4]).

54.

54

Rank plots for individual treatments for ACQ responders at 6 months (fixed effect model)

Line colors denote the treatment group. FP:fluticasone propionate, GLY: glycopyrronium, IND:indacaterol, MF:mometasone furoate, SAL:salmeterol, Tio:tiotropium.

32. Mean and median ranking for individual treatments for ACQ responders at 6 months sorted by mean rank (fixed‐effect model).
Treatments Mean Rank Median 95% CrI
MF/IND 320 1.78 1 (1.00, 4.00)
MF/GLY/IND 80 2.17 2 (1.00, 5.00)
MF/IND 160 3.44 3 (1.00, 6.00)
MF/GLY/IND 160 3.54 4 (1.00, 6.00)
FP/SAL 500 4.89 5 (3.00, 6.00)
FP/SAL 500 + Tio 5.17 6 (1.00, 6.00)

CrI=credible interval, FP=fluticasone propionate, GLY= glycopyrronium, IND=indacaterol, MF=mometasone furoate, SAL=salmeterol, Tio=tiotropium.

3.1.2 Asthma control questionnaire (ACQ) responders at 12 months.
3.1.2.1 Grouped treatments

For this outcome, 5 trials (7391 participants) comparing four treatment groups were included in the NMA (Figure 9). A summary of the studies included in the analysis is presented in Appendix 14.

3.1.2.1.1 Model selection and inconsistency checking

For this subjective outcome comparing pharmacological interventions, a Log‐Normal (‐2.93, 1.582) prior distribution was used for the between‐study heterogeneity (Turner 2015).

Model fit parameters for the fixed‐effect and random‐effects models are reported in Appendix 3. While the random‐effects model appears to fit the data well, the total residual deviance for the fixed‐effect model is a little high. The between‐study heterogeneity was low. As the difference in DICs between the fixed‐effect and random‐effects models was less than 3, the simpler fixed‐effect model was chosen, however due to the poor fit of this model, results for the random‐effects model are presented along with the results for the fixed‐effect model in Section 3.1.2.1.2.

A node‐splitting model was fit to assess inconsistency. The results of node‐splitting are presented in Table 51. There was no evidence to suggest inconsistency in the network.

33. Node‐splitting results for ACQ responders at 12 months for grouped treatments.
Model p LOR
(95% CrI)
HD Triple vs. MD‐ICS/LABA
Direct 0.804 0.310
(‐0.404, 1.018)
Indirect 0.203
(‐0.566, 0.960)
Network 0.263
(‐0.172, 0.672)
MD Triple vs. HD‐ICS/LABA
Direct 0.412 ‐0.129
(‐0.775, 0.527)
Indirect 0.228
(‐0.599, 1.077)
Network 0.014
(‐0.408, 0.469)
HD Triple vs. MD Triple
Direct 0.752 0.327
(‐0.384, 1.033)
Indirect 0.167
(‐0.822, 1.143)
Network 0.286
(‐0.192, 0.747)

Negative LOR favours the second named treatment. CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; LOR log odds ratio; MD: medium dose.

3.1.2.1.2 NMA results

The odds ratios of ACQ responders at 12 months are presented in Figure 55. The odds ratios of ACQ responders at 12 months comparing all treatment groups against each other are reported in Table 52.

55.

55

Forest plot of odds ratios relative to MD‐ICS/LABA for ACQ responders at 12 months for grouped treatments (fixed‐ and random‐effectsmodel).

Odds ratio greater than one favors the comparator treatment over MD‐ICS/LABA. CrI: credible interval, HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

34. Odds ratio for ACQ responders at 12 months for grouped treatments.
Comparison Odds Ratio (95% CrI)
Fixed Effect Model Random Effects Model
HD‐ICS/LABA vs MD‐ICS/LABA 0.993 (0.839, 1.173) 0.978 (0.736, 1.245)
MD Triple vs. MD‐ICS/LABA 0.983 (0.826, 1.169) 0.979 (0.742, 1.280)
HD Triple vs MD‐ICS/LABA 1.306 (1.072, 1.592) 1.303 (0.959, 1.750)
MD Triple vs. HD‐ICS/LABA 0.990 (0.819, 1.199) 1.000 (0.752, 1.382)
HD Triple vs HD‐ICS/LABA 1.316 (1.148, 1.509) 1.331 (1.084, 1.690)
HD Triple vs MD Triple 1.329 (1.072, 1.647) 1.332 (0.957, 1.844)

The second named treatment is the baseline intervention. Odds Ratio greater than one favours the treatment named first in the comparisons. CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

Results for the fixed‐effect and random‐effects models are largely consistent in terms of odds ratios; in both models HD Triple increases the odds of ACQ response at 12 months compared to HD‐ICS/LABA (OR 1.32 [95%CrI 1.15 to 1.51] and 1.33 [1.08 to 1.69] for the fixed‐effect and random‐effects models, respectively). In the fixed‐effect model, HD Triple increases the odds of ACQ response compared to MD‐ICS/LABA and MD Triple (OR 1.31 [95% CrI 1.07 to 1.59] and 1.33 [1.07 to 1.65], respectively). The credible intervals for these comparisons for the random‐effects model include the “null” effect. An NMA summary of findings is presented in Table 12.

The density plot for the between‐study heterogeneity is presented in Figure 56. Its high peak close to zero is consistent with the fixed‐effect model, although higher values cannot be discarded.

56.

56

Density plot for the between‐study standard deviation (SD) for the random effects model for ACQ Responders at 12 months for grouped interventions

The rank plots for grouped treatments are presented in Figure 57, and the mean and median ranks are presented in Table 53. HD Triple ranks higher than the other grouped treatments (median rank 1 [95% CrI 1 to 1] for the fixed‐effect model, median rank 1 [95% CrI 1 to 2] for the random‐effects model).

57.

57

Rank plots for grouped treatments for ACQ responders at 12 months for the fixed effect (A) and random effects (B) model.

HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

35. Mean and median ranking for grouped treatments for ACQ responders at 12 months sorted by mean rank.
Fixed Effects Model
Treatments Mean Rank Median Rank 95% CrI
HD Triple 1.01 1 (1.00, 1.00)
MD‐ICS/LABA 2.88 3 (2.00, 4.00)
HD‐ICS/LABA 2.99 3 (2.00, 4.00)
MD Triple 3.11 3 (2.00, 4.00)
Random Effects Model
Treatments Mean Rank Median Rank 95% CrI
HD Triple 1.09 1 (1.00, 2.00)
MD‐ICS/LABA 2.81 3 (1.00, 4.00)
MD Triple 3.04 3 (1.00, 4.00)
HD‐ICS/LABA 3.07 3 (2.00, 4.00)

CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

3.1.2.1.3 Pairwise meta‐analysis

Results of pairwise meta‐analysis are presented in Analysis 4.2 and Table 13. There is moderate evidence that HD Triple increases ACQ responders at 12 months compared to MD Triple (RR 1.08 [95% CI 1.01 to 1.16]; ABI 58 more per 1000 patients and HD Triple compared to MD‐ICS/LABA (RR 1.08 [95% CI 1.01 to 1.16]; ABI 58 more per 1000 patients).

4.2. Analysis.

4.2

Comparison 4: Asthma Control Questionnaire responders, Outcome 2: ACQ responders at 12 months

The evidence suggests triple therapy (ICS/LABA/LAMA) increases ACQ responders at 12 months compared to dual therapy (ICS/LABA) (RR 1.05 [95% CI 1.02 to 1.09]; I2 = 75%) when analysed using the fixed‐effect model. However, the confidence intervals included the null effect when Kerstjens 2012 was removed or the random‐effects model was used. Therefore, it is very uncertain if triple therapy (ICS/LABA/LAMA) increases ACQ responders at 12 months compared to dual therapy (ICS/LABA).

The results were unchanged when van Zyl‐Smit 2020, which is considered at high risk of bias due to high attrition rates, was removed. The use of fixed‐effect or random‐effect analysis did not change the results except for triple versus dual therapy as mentioned above and HD Triple vs. HD‐ICS/LABA in which the confidence intervals included the “null” effect with the random‐effects analysis.

3.1.2.2 Individual treatments

For this outcome, 2 trials (3906 participants) comparing five distinct treatments were included in the NMA (Figure 58). A summary of the studies included is presented in Appendix 15. Two studies (Kerstjens 2012, and Virchow 2019) that were identified were excluded from this analysis, as they were disconnected from the main network shown in Figure 58.

58.

58

Network diagram for ACQ responders at 12 months for individual interventions.

Node colors denote the treatment group. The size of the nodes and the thickness of edges depend on the number of people randomised and the number of trials conducted. FP:fluticasone propionate, GLY: glycopyrronium, IND:indacaterol, MF:mometasone furoate, SAL:salmeterol.

3.1.2.2.1 Model selection and inconsistency checking

Model fit parameters for the fixed‐effect and random‐effects models are reported in Appendix 3. Both fixed‐effect and random‐effects models fit the data well. The between‐study heterogeneity was low. As the difference in DICs between the fixed‐effect and random‐effects models was less than 3, the simpler fixed‐effect model was chosen. Results for the fixed‐effect model are presented in Section 3.1.2.2.2. There is no potential for inconsistency in this network as there is no independent, indirect evidence for any of the comparisons.

3.1.2.2.2 NMA results

The odds ratios of ACQ responders at 12 months, compared to MF/IND 160/150 (MD‐ICS/LABA), are presented in Figure 59. The odds ratios of ACQ responders at 12 months comparing all treatment groups against each other are reported in Table 54.

59.

59

Forest plot of odds ratios relative to MF/IND160 for ACQ responders at 12 months for individual treatments (fixed effect model)

Odds Ratio greater than one favors the comparator treatment over MF/IND 160.CrI: credible interval, FP:fluticasone propionate, GLY: glycopyrronium, IND:indacaterol, MF:mometasone furoate, SAL:salmeterol.

36. Odds ratio for ACQ responders at 12 months for individual treatments (fixed‐effect model).
Comparison Odds Ratio (95% CrI)
FP/SAL 500 vs. MF/IND 160 0.884 (0.715, 1.093)
MF/IND 320 vs. MF/IND 160 1.053 (0.847, 1.309)
MF/GLY/IND 80 vs. MF/IND 160 0.889 (0.690, 1.146)
MF/GLY/IND 160 vs. MF/IND 160 1.235 (0.950, 1.612)
MF/IND 320 vs. FP/SAL 500 1.192 (0.964, 1.475)
MF/GLY/IND 80 vs. FP/SAL 500 1.006 (0.783, 1.293)
MF/GLY/IND 160 vs. FP/SAL 500 1.397 (1.078, 1.819)
MF/GLY/IND 80 vs. MF/IND 320 0.844 (0.654, 1.090)
MF/GLY/IND 160 vs. MF/IND 320 1.173 (0.901, 1.532)
MF/GLY/IND 160 vs. MF/GLY/IND 80 1.389 (1.051, 1.838)

The second named treatment is the baseline intervention. Odds ratio greater than one favours the treatment named first in the comparisons. Treatment comparisons in bold do not include the “null” effect. CrI=credible interval, FP=fluticasone propionate, GLY= glycopyrronium, IND=indacaterol, MF=mometasone furoate, SAL=salmeterol, Tio=tiotropium.

There is no evidence to suggest that there is a change in odds of ACQ responders at 12 months for any individual treatments compared to MF/IND 160/150 µg (MD‐ICS/LABA). However, there is evidence to suggest that MF/GLY/IND 160/50/150 µg (MD Triple) increases the odds of ACQ responders at 12 months compared to MF/GLY/IND 80/50/150 µg (LD Triple) (OR 1.39 [95% CrI 1.05 to 1.84]) and MF/GLY/IND 160/50/150 µg (MD Triple) increases the odds of ACQ responders at 12 months compared to FP/SAL 500/50 µg (HD‐ICS/LABA) (OR 1.40 [95% CrI 1.08 to 1.82]).

The rank plots for individual treatments are presented in Figure 60, and the mean and median ranks are presented in Table 55. MF/GLY/IND 160/50/150 µg (MD Triple) has the highest probability of being the best treatment (median rank 1 [95% CrI 1 to 3]), but credible intervals for treatment ranks are very wide.

60.

60

Rank plots for individual treatments for ACQ responders at 12 months (fixed effect model)

Line colors denote the treatment group. FP:fluticasone propionate, GLY: glycopyrronium, IND:indacaterol, MF:mometasone furoate, SAL:salmeterol.

37. Mean and median ranks for individual treatments for ACQ responders at 12 months sorted by mean rank (fixed‐effect model).
Treatments Mean Rank Median Rank 95% CrI
MF/GLY/IND 160 1.19 1 (1.00, 3.00)
MF/IND 320 2.35 2 (1.00, 4.00)
MF/IND 160 2.93 3 (1.00, 5.00)
MF/GLY/IND 80 4.19 4 (2.00, 5.00)
FP/SAL 500 4.33 4 (3.00, 5.00)

CrI=credible interval, FP=fluticasone propionate, GLY= glycopyrronium, IND=indacaterol, MF=mometasone furoate, SAL=salmeterol.

3.2 Serious adverse events (SAEs)
3.2.1 All‐cause SAEs
3.2.1.1 Grouped treatments

For this outcome, 13 trials (14,476 participants) comparing four treatment groups were included in the NMA (Figure 10). A summary of the studies included in the analysis is presented in Appendix 16.

3.2.1.1.1 Model selection and inconsistency checking

The Turner prior for adverse event outcomes comparing pharmacological interventions, i.e. a Log‐Normal (‐2.10, 1.582) prior distribution, was used for the between‐study heterogeneity (Turner 2015).

Model fit parameters for the fixed‐effect and random‐effects models are reported in Appendix 3. Both fixed‐effect and random‐effects models fit the data well. The between‐study heterogeneity was low. As the difference in DICs between the fixed‐effect and random‐effects models was less than 3, the simpler fixed‐effect model was chosen. Results for the fixed‐effect model are presented in Section 3.2.1.1.2.

A node‐splitting model was fit to assess inconsistency. The results of node‐splitting are presented in Table 56. There was no evidence to suggest inconsistency in the network.

38. Node‐splitting results for all‐cause SAEs for grouped treatments.
Model p LORs(95% CrI)
HD‐ICS/LABA vs. MD‐ICS/LABA
Direct 0.410 ‐0.005
(‐0.364, 0.298)
Indirect 0.388
(‐0.612, 1.359)
Network 0.044
(‐0.232, 0.298)
MD Triple vs. MD‐ICS/LABA
Direct 0.237 0.166
(‐0.258, 0.563)
Indirect ‐0.409
(‐1.401, 0.485)
Network 0.087
(‐0.250, 0.402)
HD Triple vs. MD‐ICS/LABA
Direct 0.961 0.035
(‐0.502, 0.555)
Indirect 0.012
(‐0.565, 0.543)
Network 0.039
(‐0.293, 0.349)
MD Triple vs. HD‐ICS/LABA
Direct 0.746 0.083
(‐0.424, 0.587)
Indirect ‐0.038
(‐0.656, 0.625)
Network 0.042
(‐0.276, 0.368)
HD Triple vs. HD‐ICS/LABA
Direct 0.248 ‐0.051
(‐0.379, 0.267)
Indirect 0.511
(‐0.442, 1.523)
Network ‐0.005
(‐0.282, 0.261)
HD Triple vs. MD Triple
Direct 0.456 0.013
(‐0.390, 0.438)
Indirect ‐0.340
(‐1.315, 0.547)
Network ‐0.050
(‐0.381, 0.270)

Negative LOR favours the second named treatment. CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; LOR log odds ratio; MD: medium dose.

3.2.1.1.2 NMA results

The odds ratios of all‐cause SAEs are presented in Figure 61. The odds ratios of all‐cause SAEs comparing all treatment groups against each other are reported in Table 57. There is no evidence to suggest there is a change in odds of all‐cause SAEs for any of the treatment comparisons. An NMA summary of findings is presented in Table 14.

61.

61

Forest plots of odds ratios for all‐cause SAEs for grouped treatments (fixed effect model).

Odds ratio less than one favors the first named treatment. CrI: credible interval, HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

39. Odds ratios for all‐cause SAEs for grouped treatments (fixed‐effect model).
Comparison Odds Ratio (95% CrI)
HD‐ICS/LABA vs MD‐ICS/LABA 1.063 (0.853, 1.329)
MD Triple vs. MD‐ICS/LABA 1.102 (0.839, 1.446)
HD Triple vs MD‐ICS/LABA 1.049 (0.803, 1.372)
MD Triple vs. HD‐ICS/LABA 1.037 (0.799, 1.340)
HD Triple vs HD‐ICS/LABA 0.986 (0.793, 1.227)
HD Triple vs MD Triple 0.952 (0.727, 1.250)

The second named treatment is the baseline intervention. Odds ratio less than one favours the treatment named first in the comparisons. CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

The rank plots for grouped treatments are presented in Figure 62, and the mean and median ranks are presented in Table 58. Treatment ranks are very uncertain, ‐ none of the treatments have over 50% probability of ranking in any of the four possible positions, and all treatments have the same, very wide, 95% CrIs.

62.

62

Rank plots for grouped treatments for all‐cause SAEs (fixed effect model)

HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

40. Mean and median ranking for grouped treatments for all‐cause SAEs sorted by mean rank (fixed‐effect model).
Treatments Mean Rank Median Rank 95% CrI
MD‐ICS/LABA 1.90 2 (1.00, 4.00)
HD Triple 2.45 2 (1.00, 4.00)
HD‐ICS/LABA 2.65 3 (1.00, 4.00)
MD Triple 3.01 3 (1.00, 4.00)

CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

3.2.1.1.3 Pairwise meta‐analysis

The evidence suggests there is no or little difference in all‐cause SAEs for any of the treatment comparisons [moderate to high certainty] (Analysis 5.1Table 15). There was no difference in the results between fixed‐ and random‐effects analyses.

5.1. Analysis.

5.1

Comparison 5: Serious adverse events, adverse events, and dropouts due to adverse event, Outcome 1: All cause SAEs

3.2.1.2 Individual treatments

For this outcome, 10 trials (11,936 participants) comparing 14 distinct treatments were included in the NMA (Figure 63). A summary of the studies included is presented in Appendix 17. Seven studies (Bodzenta‐Lukaszyk 2012Cukier 2013Kerstjens 2012aKerstjens 2012bPeters 2008Virchow 2019a, and Virchow 2019b) that were identified were excluded from this analysis as they were disconnected from the main network shown in Figure 63.

63.

63

Network diagram for all‐cause SAEs for individual interventions.

Node colors denote the treatment group. The size of the nodes and the thickness of edges depend on the number of people randomised and the number of trials conducted. FF:fluticasone furoate, FM:formoterol, FP:fluticasone propionate, GLY: glycopyrronium, IND:indacaterol, MF:mometasone furoate, SAL:salmeterol, Tio:tiotropium, UMEC: umeclidinium, VI:vilanterol.

3.2.1.2.1 Model selection and inconsistency checking

The Turner prior for adverse event outcomes comparing pharmacological interventions, i.e. a Log‐Normal (‐2.10, 1.582) prior distribution, was used for the between‐study heterogeneity (Turner 2015).

Model fit parameters for the fixed‐effect and random‐effects models are reported in Appendix 3. Both fixed‐effect and random‐effects models fit the data well. The between‐study heterogeneity was low. As the difference in DICs between the fixed‐effect and random‐effects models was less than 3, the simpler fixed‐effect model was chosen. Results for the fixed‐effect model are presented in Section 3.2.1.2.2. There is no potential for inconsistency in this network as there is no independent, indirect evidence for any of the comparisons.

3.2.1.2.2 NMA results

The odds ratios of all‐cause SAEs, compared to FP/SAL 250/50 µg (MD‐ICS/LABA), are presented in Figure 64. The odds ratios of all‐cause AEs comparing all treatment groups against each other are reported in Table 59.

64.

64

Forest plot of odds ratios relative to FP/SAL 250 for all‐cause SAEs for individual treatments.

Odds ratio less than one favors the comparator treatment over FP/SAL 250. Crl:credible interval, FF:fluticasone furoate, FM:formoterol, FP:fluticasone propionate, GLY: glycopyrronium, IND:indacaterol, MF:mometasone furoate, SAL:salmeterol, Tio:tiotropium, UMEC: umeclidinium, VI:vilanterol.

41. Odds Ratios for all‐cause SAEs for individual treatments (fixed‐effect model).
Comparison Odds Ratio (95% CrI)
FF/VI 100 vs. FP/SAL 250 0.781 (0.184, 3.075)
MF/FM 200 vs. FP/SAL 250 0.694 (0.220, 2.042)
MF/IND 160 vs. FP/SAL 250 1.956 (0.934, 4.339)
FP/SAL 200 vs. FP/SAL 250 2.741 (0.897, 9.796)
FP/SAL 500 vs. FP/SAL 250 1.988 (1.052, 4.036)
FF/VI 200 vs. FP/SAL 250 0.581 (0.123, 2.567)
MF/FM 400 vs. FP/SAL 250 0.390 (0.034, 3.439)
MF/IND 320 vs. FP/SAL 250 2.480 (1.195, 5.452)
MF/GLY/IND 80 vs. FP/SAL 250 2.347 (1.109, 5.275)
FF/UMEC/VI 100 vs. FP/SAL 250 0.679 (0.144, 3.027)
MF/GLY/IND 160 vs. FP/SAL 250 2.391 (1.130, 5.357)
FF/UMEC/VI 200 vs. FP/SAL 250 0.613 (0.129, 2.729)
FP/SAL 500 +Tio vs. FP/SAL 250 2.827 (1.101, 7.467)
MF/FM 200 vs. FF/VI 100 0.887 (0.149, 5.342)
MF/IND 160 vs. FF/VI 100 2.525 (0.525, 13.046)
FP/SAL 200 vs. FF/VI 100 3.555 (0.598, 23.952)
FP/SAL 500 vs. FF/VI 100 2.571 (0.563, 12.702)
FF/VI 200 vs. FF/VI 100 0.746 (0.416, 1.314)
MF/FM 400 vs. FF/VI 100 0.499 (0.031, 6.756)
MF/IND 320 vs. FF/VI 100 3.198 (0.669, 16.385)
MF/GLY/IND 80 vs. FF/VI 100 3.032 (0.627, 15.679)
FF/UMEC/VI 100 vs. FF/VI 100 0.872 (0.487, 1.547)
MF/GLY/IND 160 vs. FF/VI 100 3.086 (0.639, 15.980)
FF/UMEC/VI 200 vs. FF/VI 100 0.787 (0.431, 1.413)
FP/SAL 500 +Tio vs. FF/VI 100 3.641 (0.684, 20.535)
MF/IND 160 vs. MF/FM 200 2.842 (0.758, 11.364)
FP/SAL 200 vs. MF/FM 200 4.000 (0.833, 21.872)
FP/SAL 500 vs. MF/FM 200 2.890 (0.816, 11.003)
FF/VI 200 vs. MF/FM 200 0.839 (0.127, 5.448)
MF/FM 400 vs. MF/FM 200 0.569 (0.065, 3.737)
MF/IND 320 vs. MF/FM 200 3.602 (0.966, 14.291)
MF/GLY/IND 80 vs. MF/FM 200 3.408 (0.907, 13.699)
FF/UMEC/VI 100 vs. MF/FM 200 0.982 (0.149, 6.399)
MF/GLY/IND 160 vs. MF/FM 200 3.471 (0.924, 13.957)
FF/UMEC/VI 200 vs. MF/FM 200 0.885 (0.133, 5.777)
FP/SAL 500 +Tio vs. MF/FM 200 4.097 (0.979, 18.243)
FP/SAL 200 vs. MD/IND 160 1.396 (0.451, 4.942)
FP/SAL 500 vs. MD/IND 160 1.018 (0.701, 1.479)
FF/VI 200 vs. MD/IND 160 0.294 (0.052, 1.566)
MF/FM 400 vs. MD/IND 160 0.197 (0.016, 2.001)
MF/IND 320 vs. MD/IND 160 1.267 (0.888, 1.814)
MF/GLY/IND 80 vs. MD/IND 160 1.199 (0.807, 1.787)
FF/UMEC/VI 100 vs. MD/IND 160 0.344 (0.061, 1.836)
MF/GLY/IND 160 vs. MD/IND 160 1.221 (0.822, 1.819)
FF/UMEC/VI 200 vs. MD/IND 160 0.310 (0.055, 1.663)
FP/SAL 500 +Tio vs. MD/IND 160 1.442 (0.720, 2.838)
FP/SAL 500 vs. FP/SAL 200 0.731 (0.218, 2.117)
FF/VI 200 vs. FP/SAL 200 0.209 (0.029, 1.365)
MF/FM 400 vs. FP/SAL 200 0.140 (0.009, 1.649)
MF/IND 320 vs. FP/SAL 200 0.909 (0.258, 2.794)
MF/GLY/IND 80 vs. FP/SAL 200 0.860 (0.241, 2.685)
FF/UMEC/VI 100 vs. FP/SAL 200 0.244 (0.033, 1.601)
MF/GLY/IND 160 vs. FP/SAL 200 0.875 (0.245, 2.734)
FF/UMEC/VI 200 vs. FP/SAL 200 0.220 (0.030, 1.450)
FP/SAL 500 +Tio vs. FP/SAL 200 1.028 (0.258, 3.683
FF/VI 200 vs. FP/SAL 500 0.289 (0.053, 1.473)
MF/FM 400 vs. FP/SAL 500 0.194 (0.016, 1.894)
MF/IND 320 vs. FP/SAL 500 1.244 (0.874, 1.776)
MF/GLY/IND 80 vs. FP/SAL 500 1.177 (0.795, 1.750)
FF/UMEC/VI 100 vs. FP/SAL 500 0.338 (0.062, 1.723)
MF/GLY/IND 160 vs. FP/SAL 500 1.199 (0.810, 1.781)
FF/UMEC/VI 200 vs. FP/SAL 500 0.305 (0.056, 1.568)
FP/SAL 500 +Tio vs. FP/SAL 500 1.415 (0.710, 2.783)
MF/FM 400 vs. FF/VI 200 0.668 (0.040, 9.683)
MF/IND 320 vs. FF/VI 200 4.305 (0.813, 24.379)
MF/GLY/IND 80 vs. FF/VI 200 4.077 (0.765, 23.295)
FF/UMEC/VI 100 vs. FF/VI 200 1.171 (0.633, 2.166)
MF/GLY/IND 160 vs. FF/VI 200 4.147 (0.778, 23.671)
FF/UMEC/VI 200 vs. FF/VI 200 1.056 (0.562, 1.976)
FP/SAL 500 +Tio vs. FF/VI 200 4.897 (0.838, 30.319)
MF/IND 320 vs. MF/FM 400 6.418 (0.637, 80.971)*
MF/GLY/IND 80 vs. MF/FM 400 6.085 (0.598, 77.060)*
FF/UMEC/VI 100 vs. MF/FM 400 1.750 (0.121, 29.613)
MF/GLY/IND 160 vs. MF/FM 400 6.190 (0.610, 78.360)*
FF/UMEC/VI 200 vs. MF/FM 400 1.578 (0.108, 26.831)
FP/SAL 500 +Tio vs. MF/FM 400 7.299 (0.674, 98.076)*
MF/GLY/IND 80 vs. MF/IND 320 0.947 (0.646, 1.384)
FF/UMEC/VI 100 vs. MF/IND 320 0.272 (0.048, 1.443)
MF/GLY/IND 160 vs. MF/IND 320 0.964 (0.660, 1.408)
FF/UMEC/VI 200 vs. MF/IND 320 0.245 (0.043, 1.306)
FP/SAL 500 +Tio vs. MF/IND 320 1.138 (0.574, 2.214)
FF/UMEC/VI 100 vs. MF/GLY/IND 80 0.287 (0.050, 1.534)
MF/GLY/IND 160 vs. MF/GLY/IND 80 1.018 (0.710, 1.461)
FF/UMEC/VI 200 vs. MF/GLY/IND 80 0.259 (0.045, 1.391)
FP/SAL 500 +Tio vs. MF/GLY/IND 80 1.203 (0.644, 2.194)
MF/GLY/IND 160 vs. FF/UMEC/VI 100 3.544 (0.663, 20.285)
FF/UMEC/VI 200 vs. FF/UMEC/VI 100 0.902 (0.487, 1.662)
FP/SAL 500 +Tio vs. FF/UMEC/VI 100 4.186 (0.714, 25.990)
FF/UMEC/VI 200 vs. MF/GLY/IND 160 0.254 (0.044, 1.368)
FP/SAL 500 +Tio vs. MF/GLY/IND 160 1.182 (0.633, 2.154)
FP/SAL 500 +Tio vs. FF/UMEC/VI 200 0.215 (0.035, 1.268)

The second named treatment is the baseline intervention. Odds ratio less than one favours the treatment named first in the comparisons. Treatment comparisons in bold are do not include the “null” effect. *Hazard ratios are extremely uncertain due to network sparsity and should be treated with caution. Crl=credible interval, FF=fluticasone furoate, FM=formoterol, FP=fluticasone propionate, GLY= glycopyrronium, IND=indacaterol, MF=mometasone furoate, SAL=salmeterol, Tio=tiotropium, UMEC= umeclidinium, VI=vilanterol.

FP/SAL 500/50 µg (HD‐ICS/LABA), MF/IND 320/150 µg (HD‐ICS/LABA), MF/GLY/IND 80/50/150 µg (LD Triple), MF/GLY/IND 160/50/150 µg (MD Triple), and FP/SAL 500/50 µg + Tio 5 µg (HD Triple) increase the odds of all‐cause SAEs compared to FP/SAL 250/50 µg (MD‐ICS/LABA). There is a lot of uncertainty in the estimates of odds ratios, and many of the comparisons have wide credible intervals.

The rank plots for individual treatments are presented in Figure 65, and the mean and median ranks are presented in Table 60. Although MF/FM 400/10 µg (HD‐ICS/LABA) has the highest probability of being the best treatment, the probability that it is the best treatment is only a little over 50%. Overall, treatment ranks are very uncertain, and all the other treatments have under 50% probability for any of the 14 other possible ranks.

65.

65

Rank plots for individual treatments for all‐cause SAEs (fixed effect model).

Line colors denote the treatment group. FF:fluticasone furoate, FM:formoterol, FP:fluticasone propionate, GLY: glycopyrronium, IND:indacaterol, MF:mometasone furoate, SAL:salmeterol, Tio:tiotropium, UMEC: umeclidinium, VI:vilanterol.

42. Mean and median ranking for individual treatments for all‐cause SAEs sorted by mean rank (fixed‐effect model).
Treatments Mean Rank Median Rank 95% CrI
MF/FM 400 3.32 1 (1.00, 14.00)
FF/VI 200 3.54 3 (1.00, 11.00)
FF/UMEC/VI 200 3.91 3 (1.00, 12.00)
MF/FM 200 4.33 4 (1.00, 11.00)
FF/UMEC/VI 100 4.63 4 (1.00, 13.00)
FP/SAL 250 5.53 6 (2.00, 8.00)
FF/VI 100 5.54 5 (2.00, 13.00)
MF/IND 160 8.77 9 (4.00, 12.00)
FP/SAL 500 8.99 9 (5.00, 12.00)
MF/GLY/IND 80 10.77 11 (6.00, 14.00)
MF/GLY/IND 160 10.97 11 (6.00, 14.00)
FP/SAL 200 11.26 13 (4.00, 14.00)
MF/IND 320 11.45 12 (7.00, 14.00)
FP/SAL 500 + Tio 11.99 13 (6.00, 14.00)

Crl=credible interval, FF=fluticasone furoate, FM=formoterol, FP=fluticasone propionate, GLY= glycopyrronium, IND=indacaterol, MF=mometasone furoate, SAL=salmeterol, Tio=tiotropium, UMEC= umeclidinium, VI=vilanterol.

3.2.2 Asthma‐related SAEs
3.2.2.1 Grouped treatments

For this outcome, 11 trials (13,209 participants) comparing 4 treatment groups were included in the NMA (Figure 11). A summary of the studies included in the analysis is presented in Appendix 18.

3.2.2.1.1 Model selection and inconsistency checking

The Turner prior for adverse event outcomes comparing pharmacological interventions, i.e. a Log‐Normal (‐2.10, 1.582) prior distribution, was used for the between‐study heterogeneity (Turner 2015).

Model fit parameters for the fixed‐effect and random‐effects models are reported in Appendix 3. Both fixed‐effect and random‐effects models fit the data well. The between‐study heterogeneity was low. As the difference in DICs between the fixed‐effect and random‐effects models was less than 3, the simpler fixed‐effect model was chosen. Results for the fixed‐effect model are presented in Section 3.2.1.1.2.

A node‐splitting model was fit to assess inconsistency. The results of node‐splitting are presented in Table 61. There was no evidence to suggest inconsistency in the network.

43. Node‐splitting results for asthma‐related SAEs for grouped treatments.
Model p LOR
(95% CrI)
HD‐ICS/LABA vs. MD‐ICS/LABA
Direct 0.825 0.296
(‐0.280, 0.894)
Indirect 0.109
(‐1.596, 1.815)
Network 0.259
(‐0.252, 0.822)
MD Triple vs. MD‐ICS/LABA
Direct 0.442 0.410
(‐0.266, 1.093)
Indirect 1.161
(‐0.741, 3.063)
Network 0.542
(‐0.029, 1.132)
HD Triple vs. MD‐ICS/LABA
Direct 0.410 ‐0.185
(‐1.060, 0.660)
Indirect 0.328
(‐0.628, 1.251)
Network 0.053
(‐0.531, 0.641)
MD Triple vs. HD‐ICS/LABA
Direct 0.876 0.279
(‐0.471, 1.017)
Indirect 0.386
(‐0.794, 1.545)
Network 0.284
(‐0.275, 0.840)
HD Triple vs. HD‐ICS/LABA
Direct 0.530 ‐0.161
(‐0.652, 0.296)
Indirect ‐0.804
(‐2.726, 1.179)
Network ‐0.212
(‐0.655, 0.216)
HD Triple vs. MD Triple
Direct 0.827 ‐0.580
(‐1.374, 0.104)
Indirect ‐0.391
(‐2.089, 1.219)
Network ‐0.493
(‐1.092, 0.081)

Negative LOR favours the second named treatment. CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; LOR log odds ratio; MD: medium dose.

3.2.2.1.2 NMA results

The odds ratios of asthma‐related SAEs are presented in Figure 66. The odds ratios of asthma‐related SAEs comparing all treatment groups against each other are reported in Table 62.

66.

66

Forest plots of odds ratios relative for asthma‐related SAEs for grouped treatments (fixed effect model).

Odds ratio (OR) less than one favors the first named treatment. Crl: credible interval, HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

44. Odds ratio for asthma‐related SAEs for grouped treatments (fixed‐effect model).
Comparison Odds Ratio (95% CrI)
HD‐ICS/LABA vs MD‐ICS/LABA 1.275 (0.794, 2.073)
MD Triple vs. MD‐ICS/LABA 1.711 (0.991, 2.969)
HD Triple vs MD‐ICS/LABA 1.047 (0.604, 1.824)
MD Triple vs. HD‐ICS/LABA 1.342 (0.819, 2.172)
HD Triple vs HD‐ICS/LABA 0.821 (0.556, 1.203)
HD Triple vs MD Triple 0.612 (0.363, 1.034)

The second named treatment is the baseline intervention. Odds ratio less than one favours the treatment named first in the comparisons. CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

There is insufficient evidence to suggest a difference in odds of asthma‐related SAEs for any treatment comparisons. An NMA summary of findings is presented in Table 16.

The rank plots for grouped treatments are presented in Figure 67, and the mean and median ranks are presented in Table 63. MD‐ICS/LABA ranks higher than the other grouped treatments (median rank 1 [95% CrI 1 to 3] and MD Triple has a high probability of being the worst group for this outcome (median rank 4 [95% CrI 2 to 4]).

67.

67

Rank plots for grouped treatments for asthma‐related SAEs (fixed effect model)

HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

45. Mean and median ranking for grouped treatments for asthma‐related SAEs sorted by mean rank (fixed‐effect model).
Treatments Mean Rank Median 95% CrI
MD‐ICS/LABA 1.62 1 (1.00, 3.00)
HD Triple 1.75 2 (1.00, 3.00)
HD‐ICS/LABA 2.81 3 (1.00, 4.00)
MD Triple 3.82 4 (2.00, 4.00)

CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

3.2.2.1.3 Pairwise meta‐analysis

The evidence suggests there is no or little difference in asthma‐related SAEs for any of the treatment comparisons [moderate to high certainty] (Analysis 5.2Table 15). There was no difference in the results between fixed‐effect and random‐effects models.

5.2. Analysis.

5.2

Comparison 5: Serious adverse events, adverse events, and dropouts due to adverse event, Outcome 2: Asthma‐related SAEs

3.2.2.2 Individual treatments

For this outcome, 9 trials (11,246 participants) comparing 14 distinct treatments were included in the NMA (Figure 68). A summary of the studies included is presented in Appendix 19. Four studies (Kerstjens 2012aKerstjens 2012bVirchow 2019a, and Virchow 2019b) that were identified were excluded from this analysis as they were disconnected from the main network shown in Figure 68.

68.

68

Network diagram for asthma‐related SAEs for individual interventions.

Node colors denote the treatment group. The size of the nodes and the thickness of edges depend on the number of people randomised and the number of trials conducted. FF:fluticasone furoate, FM:formoterol, FP:fluticasone propionate, GLY: glycopyrronium, IND:indacaterol, MF:mometasone furoate, SAL:salmeterol, Tio:tiotropium, UMEC: umeclidinium, VI:vilanterol.

As the data are sparse, with few studies per comparison which have very few events in each treatment arm, the results for this analysis are very uncertain.

One of the arms (for the treatment MF/FM 200) in Weinstein 2010 reported no events. The second arm (for the treatment MF/FM 400) for this study reported only one event. The zero cell caused problems with model convergence, attributable to the fact that this is the only study that contributes MF/FM 400 to the network. We added a continuity correction of 0.5 to the zero count events to help improve model convergence due to the sparsity of the evidence in this study. When fitting this model in OpenBUGS (version 3.2.3), a less‐vague prior of Normal (0, 0.01) was also used for the relative treatment effects to make the model more stable.

3.2.2.2.1 Model selection and inconsistency checking

The Turner prior for adverse event outcomes comparing pharmacological interventions, i.e. a Log‐Normal (‐2.10, 1.582) prior distribution, was used for the between‐study heterogeneity (Turner 2015).

Model fit parameters for the fixed‐effect and random‐effects models are reported in Appendix 3. Both fixed‐effect and random‐effects models fit the data well. The between‐study heterogeneity was low, with a wide credible interval. As the difference in DICs between the fixed‐effect and random‐effects models was less than 3, the simpler fixed‐effect model was chosen. Results for the fixed‐effect model are presented in Section 3.2.2.2.2.

There is no potential for inconsistency in this network as there is no independent, indirect evidence for any of the comparisons.

3.2.2.2.2 NMA results

The odds ratios of asthma‐related SAEs, compared to MF/IND160/150 µg (MD‐ICS/LABA), are presented in Figure 69. The odds ratios of asthma‐related SAEs comparing all treatment groups against each other are reported in Table 64. There is evidence to suggest that MF/IND 320/150 µg (HD‐ICS/LABA) and MF/GLY/IND 80/50/150 µg (LD Triple) increase the odds of asthma‐related SAEs compared to FP/SAL 250/50 µg (MD‐ICS/LABA) (OR 4.1 [95% CrI 1.003 to 21.4] and 5.0 [1.2 to 26.3] respectively).

69.

69

Forest plot of odds ratios for asthma‐related SAEs relative to FP/SAL 250 for individual treatments.

Odds ratio less than one favors the comparator treatment over FP/SAL 250. FF:fluticasone furoate, FM:formoterol, FP:fluticasone propionate, GLY: glycopyrronium, IND:indacaterol, MF:mometasone furoate, SAL:salmeterol, Tio:tiotropium, UMEC: umeclidinium, VI:vilanterol.

46. Odds ratio for asthma‐related SAEs for individual treatments (fixed‐effect model).
Comparison Odds Ratio (95% CrI)
FF/ VI 200 vs. FP/SAL 250 0.451 (0.019, 4.920)
MF/FM 200 vs. FP/SAL 250 0.836 (0.024, 22.820)
MF/IND 160 vs. FP/SAL 250 2.724 (0.634, 14.430)
FP/SAL 200 vs. FP/SAL 250 3.846 (0.808, 26.520)
FP/SAL 500 vs. FP/SAL 250 2.926 (0.924, 12.610)
FF/VI 200 vs. FP/SAL 250 0.376 (0.014, 5.295)
MF/FM 400 vs. FP/SAL 250 3.166 (0.028, 889.500)
MF/IND 320 vs. FP/SAL 250 4.102 (1.003, 21.370)
MF/GLY/IND 80 vs. FP/SAL 250 5.028 (1.228, 26.260)
FF/UMEC/VI 100 vs. FP/SAL 250 0.446 (0.017, 6.139)
MF/GLY/IND 160 vs. FP/SAL 250 3.105 (0.722, 16.610)
FF/UMEC/VI 200 vs. FP/SAL 250 0.239 (0.008, 3.558)
FP/SAL 500 + Tio vs. FP/SAL 250 2.025 (0.182, 18.300)
MF/FM 200 vs. FF/VI 100 1.932 (0.029, 169.300)*
MF/IND 160 vs. FF/VI 100 6.296 (0.358, 218.700)*
FP/SAL 200 vs. FF/VI 100 8.997 (0.478, 337.100)*
FP/SAL 500 vs. FF/VI 100 6.779 (0.440, 210.900)*
FF/VI 200 vs. FF/VI 100 0.852 (0.265, 2.621)
MF/FM 400 vs. FF/VI 100 7.663 (0.036, 4,274.000)*
MF/IND 320 vs. FF/VI 100 9.489 (0.544, 319.600)*
MF/GLY/IND 80 vs. FF/VI 100 11.630 (0.668, 391.800)*
FF/UMEC/VI 100 vs. FF/VI 100 1.005 (0.336, 2.986)
MF/GLY/IND 160 vs. FF/VI 100 7.182 (0.405, 247.500)*
FF/UMEC/VI 200 vs. FF/VI 100 0.548 (0.137, 1.868)
FP/SAL 500 + Tio vs. FF/VI 100 4.602 (0.150, 211.300)*
MF/IND 160 vs. MF/FM 200 3.361 (0.089, 152.900)*
FP/SAL 200 vs. MF/FM 200 4.809 (0.120, 246.900)*
FP/SAL 500 vs. MF/FM 200 3.637 (0.106, 153.300)*
FF/VI 200 vs. MF/FM 200 0.438 (0.004, 33.710)
MF/FM 400 vs. MF/FM 200 3.487 (0.141, 500.800)*
MF/IND 320 vs. MF/FM 200 5.069 (0.136, 227.900)*
MF/GLY/IND 80 vs. MF/FM 200 6.216 (0.168, 280.300)*
FF/UMEC/VI 100 vs. MF/FM 200 0.520 (0.005, 39.290)
MF/GLY/IND 160 vs. MF/FM 200 3.813 (0.101, 174.100)*
FF/UMEC/VI 200 vs. MF/FM 200 0.278 (0.003, 22.100)
FP/SAL 500 + Tio vs. MF/FM 200 2.418 (0.042, 145.300)*
FP/SAL 200 vs. MF/IND 160 1.404 (0.278, 8.683)
FP/SAL 500 vs. MF/IND 160 1.086 (0.452, 2.624)
FF/VI 200 vs. MF/IND 160 0.134 (0.003, 2.880)
MF/FM 400 vs. MF/IND 160 1.141 (0.008, 395.800)*
MF/IND 320 vs. MF/IND 160 1.502 (0.673, 3.506)
MF/GLY/IND 80 vs. MF/IND 160 1.837 (0.825, 4.300)
FF/UMEC/VI 100 vs. MF/IND 160 0.158 (0.004, 3.366)
MF/GLY/IND 160 vs. MF/IND 160 1.135 (0.466, 2.821)
FF/UMEC/VI 200 vs. MF/IND 160 0.085 (0.002, 1.946)
FP/SAL 500 + Tio vs. MF/IND 160 0.745 (0.089, 4.096)
FP/SAL 500 vs. FP/SAL 200 0.782 (0.154, 3.019)
FF/VI 200 vs. FP/SAL 200 0.093 (0.002, 2.142)
MF/FM 400 vs. FP/SAL 200 0.797 (0.005, 285.000)*
MF/IND 320 vs. FP/SAL 200 1.076 (0.181, 5.240)
MF/GLY/IND 80 vs. FP/SAL 200 1.313 (0.222, 6.467)
FF/UMEC/VI 100 vs. FP/SAL 200 0.111 (0.003, 2.519)
MF/GLY/IND 160 vs. FP/SAL 200 0.811 (0.132, 4.132)
FF/UMEC/VI 200 vs. FP/SAL 200 0.059 (0.001, 1.446)
FP/SAL 500 + Tio vs. FP/SAL 200 0.515 (0.038, 4.730)
FF/VI 200 vs. FP/SAL 500 0.123 (0.003, 2.364)
MF/FM 400 vs. FP/SAL 500 1.046 (0.007, 339.600)*
MF/IND 320 vs. FP/SAL 500 1.384 (0.633, 3.121)
MF/GLY/IND 80 vs. FP/SAL 500 1.690 (0.773, 3.868)
FF/UMEC/VI 100 vs. FP/SAL 500 0.146 (0.004, 2.754)
MF/GLY/IND 160 vs. FP/SAL 500 1.046 (0.437, 2.538)
FF/UMEC/VI 200 vs. FP/SAL 500 0.079 (0.002, 1.591)
FP/SAL 500 + Tio vs. FP/SAL 500 0.688 (0.081, 3.717)
MF/FM 400 vs. FF/VI 200 9.133 (0.039, 5,439.000)*
MF/IND 320 vs. FF/VI 200 11.330 (0.526, 441.100)*
MF/GLY/IND 80 vs. FF/VI 200 13.890 (0.642, 542.400)*
FF/UMEC/VI 100 vs. FF/VI 200 1.181 (0.381, 3.783)
MF/GLY/IND 160 vs. FF/VI 200 8.546 (0.392, 338.100)*
FF/UMEC/VI 200 vs. FF/VI 200 0.645 (0.158, 2.346)
FP/SAL 500 + Tio vs. FF/VI 200 5.441 (0.148, 286.500)*
MF/IND 320 vs. MF/FM 400 1.324 (0.004, 199.100)*
MF/GLY/IND 80 vs. MF/FM 400 1.622 (0.005, 241.900)*
FF/UMEC/VI 100 vs. MF/FM 400 0.130 (0.0002, 29.950)
MF/GLY/IND 160 vs. MF/FM 400 1.002 (0.003, 152.000)*
FF/UMEC/VI 200 vs. MF/FM 400 0.069 (0.0001, 16.970)
FP/SAL 500 + Tio vs. MF/FM 400 0.617 (0.001, 121.300)*
MF/GLY/IND 80 vs. MF/IND 320 1.223 (0.587, 2.576)
FF/UMEC/VI 100 vs. MF/IND 320 0.105 (0.003, 2.221)
MF/GLY/IND 160 vs. MF/IND 320 0.756 (0.328, 1.701)
FF/UMEC/VI 200 vs. MF/IND 320 0.056 (0.001, 1.273)
FP/SAL 500 + Tio vs. MF/IND 320 0.495 (0.060, 2.606)
FF/UMEC/VI 100 vs. MF/GLY/IND 80 0.085 (0.002, 1.815)
MF/GLY/IND 160 vs. MF/GLY/IND 80 0.620 (0.289, 1.274)
FF/UMEC/VI 200 vs. MF/GLY/IND 80 0.046 (0.001, 1.040)
FP/SAL 500 + Tio vs. MF/GLY/IND 80 0.409 (0.053, 1.874)
MF/GLY/IND 160 vs. FF/UMEC/VI 100 7.224 (0.334, 279.900)*
FF/UMEC/VI 200 vs. FF/UMEC/VI 100 0.546 (0.138, 1.869)
FP/SAL 500 + Tio vs. FF/UMEC/VI 100 4.605 (0.127, 240.700)*
FF/UMEC/VI 200 vs. MF/GLY/IND 160 0.075 (0.002, 1.725)
FP/SAL 500 + Tio vs. MF/GLY/IND 160 0.660 (0.084, 3.172)
FP/SAL 500 + Tio vs. FF/UMEC/VI 200 8.563 (0.221, 485.500)*

The second named treatment is the baseline intervention. Odds ratio less than one favours the treatment named first in the comparisons. Treatment comparisons in bold do not include the “null” effect.*HRs are extremely uncertain due to network sparsity and should be interpreted with caution. Crl: credible interval, FF: fluticasone furoate, FM: formoterol, FP: fluticasone propionate, GLY: glycopyrronium, IND: indacaterol, MF: mometasone furoate, SAL: salmeterol, Tio: tiotropium, UMEC: umeclidinium, VI: vilanterol.

The impact of the zero‐cell in Weinstein 2010 identified in Section 3.2.2.2 can be observed in Figure 69, where the credible interval estimated for MF/FM 400/10 µg is wide enough that the OR could be considered not estimable. The upper credible limit for most of the other comparisons was also quite large.

The rank plots for individual treatments are presented in Figure 70, and the mean and median ranks are presented in Table 65. It is very unclear which intervention is the best, as treatment ranks are very uncertain, none of the treatments have over 50% probability for any of the 14 possible ranks. The uncertainty in ranks is further highlighted by the large overlap in their credible intervals.

70.

70

Rank plots for individual treatments for asthma‐related SAEs (fixed effect model)

Line colors denote the treatment group. FF:fluticasone furoate, FM:formoterol, FP:fluticasone propionate, GLY: glycopyrronium, IND:indacaterol, MF:mometasone furoate, SAL:salmeterol, Tio:tiotropium, UMEC: umeclidinium, VI:vilanterol.

47. Mean and median ranking for individual treatments for asthma‐related SAEs sorted by mean rank (fixed‐effect model).
Treatments Mean Rank Median Rank 95% CrI
FF /UMEC/VI 200 2.59 2.0 (1.0, 10.0)
FF/VI 200 3.95 3.0 (1.0, 12.0)
FF/VI 100 4.45 4.0 (1.0, 12.0)
FF/UMEC/VI 100 4.58 4.0 (1.0, 13.0)
FP/SAL 250 5.48 6.0 (1.0, 9.0)
MF/FM 200 5.83 5.0 (1.0, 14.0)
FP/SAL 500 + Tio 7.80 8.0 (1.0, 14.0)
MF/IND 160 8.77 9.0 (3.0, 13.0)
MF/FM 400 9.06 10.0 (1.0, 14.0)
FP/SAL 500 9.28 9.0 (5.0, 13.0)
MF/GLY/IND 160 9.47 10.0 (4.0, 13.0)
FP/SAL 200 10.46 11.0 (4.0, 14.0)
MF/IND 320 11.11 11.0 (6.0, 14.0)
MF/GLY/IND 80 12.17 13.0 (8.0, 14.0)

Crl: credible interval, FF: fluticasone furoate, FM: formoterol, FP: fluticasone propionate, GLY: glycopyrronium, IND: indacaterol, MF: mometasone furoate, SAL: salmeterol, Tio: tiotropium, UMEC: umeclidinium, VI: vilanterol.

3.3 Adverse events (AEs)

3.3.1 All‐cause AEs
3.3.1.1 Grouped treatments

For this outcome, 12 trials (12,915 participants) comparing 4 treatment groups were included in the NMA (Figure 12). A summary of the studies included in the analysis is presented in Appendix 20.

3.3.1.1.1 Model selection and inconsistency checking

The Turner prior for adverse event outcomes comparing pharmacological interventions, i.e. a Log‐Normal (‐2.10, 1.582) prior distribution, was used for the between‐study heterogeneity (Turner 2015).

Model fit parameters for the fixed‐effect and random‐effects models are reported in Appendix 3. Both fixed‐effect and random‐effects models fit the data well. The between‐study heterogeneity was low. As the difference in DICs between the fixed‐effect and random‐effects models was less than 3, the simpler fixed‐effect model was chosen. Results for the fixed‐effect model are presented in Section 3.3.1.1.2.

A node‐splitting model was fit to assess inconsistency. The results of node‐splitting are presented in Table 66. There is no evidence to suggest inconsistency in the network.

48. Node‐splitting results for all‐cause AEs for grouped treatments.
Model p LOR
(95% CrI)
HD‐ICS/LABA vs. MD‐ICS/LABA
Direct 0.976 ‐0.007
(‐0.146, 0.148)
Indirect 0.002
(‐0.413, 0.434)
Network 0.010
(‐0.126, 0.147)
MD Triple vs. MD‐ICS/LABA
Direct 0.851 ‐0.114
(‐0.317, 0.096)
Indirect ‐0.157
(‐0.579, 0.278)
Network ‐0.111
(‐0.274, 0.045)
HD Triple vs. MD‐ICS/LABA
Direct 0.513 ‐0.192
(‐0.433, 0.057)
Indirect ‐0.303
(‐0.564, ‐0.029)
Network ‐0.233
(‐0.403, ‐0.083)
MD Triple vs. HD‐ICS/LABA
Direct 0.080 ‐0.0001
(‐0.209, 0.226)
Indirect ‐0.298
(‐0.573, ‐0.037)
Network ‐0.120
(‐0.280, 0.030)
HD Triple vs. HD‐ICS/LABA
Direct 0.844 ‐0.254
(‐0.428, ‐0.093)
Indirect ‐0.212
(‐0.662, 0.225)
Network ‐0.243
(‐0.388, ‐0.117)
HD Triple vs. MD Triple
Direct 0.945 ‐0.107
(‐0.286, 0.065)
Indirect ‐0.123
(‐0.550, 0.304)
Network ‐0.122
(‐0.283, 0.024)

Negative LOR favours the second named treatment. CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; LOR log odds ratio; MD: medium dose.

3.3.1.1.2 NMA results

The odds ratios of all‐cause AEs are presented in Figure 71. The odds ratios of all‐cause AEs comparing all treatment groups against each other are reported in Table 67.

71.

71

Forest plots of odds ratios for all‐cause AEs for grouped treatments (fixed effect model).

Odds ratio less than one favors the first named treatment. Crl: credible interval, HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

49. Odds ratio for all‐cause AEs for grouped treatments (fixed‐effect model).
Comparison Odds Ratio (95% CrI)
HD‐ICS/LABA vs MD‐ICS/LABA 1.000 (0.892, 1.122)
MD Triple vs. MD‐ICS/LABA 0.890 (0.776, 1.019)
HD Triple vs MD‐ICS/LABA 0.787 (0.687, 0.902)
MD Triple vs. HD‐ICS/LABA 0.889 (0.780, 1.013)
HD Triple vs HD‐ICS/LABA 0.786 (0.702, 0.881)
HD Triple vs MD Triple 0.885 (0.777, 1.007)

The second named treatment is the baseline intervention. Odds ratio less than one favours the treatment named first in the comparisons. Treatment comparisons in bold do not include the “null” effect. CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

There is evidence to suggest that treatment with HD Triple reduces the odds of all‐cause AEs compared to MD‐ICS/LABA and HD‐ICS/LABA (OR 0.79 [95% CrI 0.69 to 0.90] and 0.79 [0.70 to 0.88], respectively). An NMA summary of findings is presented in Table 17.

The rank plots for grouped treatments are presented in Figure 72, and the mean and median ranks are presented in Table 68. HD Triple has the highest probability of being better than the other grouped treatments (median rank 1 [95% CrI 1 to 2]).

72.

72

Rank plots for grouped treatments for all‐cause AEs (fixed effect model)

HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

50. Mean and median ranking for grouped treatments for all‐cause AEs sorted by mean rank (fixed‐effect model).
Treatments Mean Rank Median Rank 95% CrI
HD Triple 1.03 1.0 (1.00, 2.00)
MD Triple 2.05 2.0 (1.00, 3.00)
MD‐ICS/LABA 3.45 3.0 (2.00, 4.00)
HD‐ICS/LABA 3.46 3.0 (2.00, 4.00)

CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

3.3.1.1.3 Pairwise meta‐analysis

The evidence suggests HD and MD Triple result in a reduction in all‐cause AEs compared to MD‐ICS/LABA (RR 0.96 [95% CI 0.91 to 1.00]; ARR 42 fewer per 1000 patients; [moderate certainty] and RR 0.92 [95% CI 0.85 to 1.00]; ARR 25 fewer per 1000 patients; [moderate certainty], respectively). 
Triple therapy (ICS/LABA/LAMA) results in a reduction in all‐cause AEs compared to dual therapy (ICS/LABA) (RR 0.93 [95% CI 0.90 to 0.96]; ARR 44 fewer per 1000 patients; [high certainty]) and HD Triple likely results in a slight reduction in all‐cause AEs compared to MD Triple (RR 0.95 [95% CI 0.90 to 1.02]; ARR 26 fewer per 1000 patients; [moderate certainty]) (Analysis 5.3Table 15).
There was no difference in the results between fixed‐effect and random‐effects models.

5.3. Analysis.

5.3

Comparison 5: Serious adverse events, adverse events, and dropouts due to adverse event, Outcome 3: All cause AEs

3.3.1.2 Individual treatments

For this outcome, 12 trials (12,009 participants) comparing 17 distinct treatments were included in the NMA (Figure 73). A summary of the studies included is presented in Appendix 21. Four studies (Kerstjens 2012aKerstjens 2012bVirchow 2019aVirchow 2019b) that were identified were excluded from this analysis as they were disconnected from the main network shown in Figure 73.

73.

73

Network diagram for all‐cause AEs for individual interventions.

Node colors denote the treatment group. BUD: budesonide, FF: fluticasone furoate, FM: formoterol, FP: fluticasone propionate, GLY: glycopyrronium, IND: indacaterol, MF: mometasone furoate, SAL: salmeterol, Tio: tiotropium, UMEC: umeclidinium, VI: vilanterol.

3.3.1.2.1 Model selection and inconsistency checking

The Turner prior for adverse event outcomes comparing pharmacological interventions, i.e. a Log‐Normal (‐2.10, 1.582) prior distribution, was used for the between‐study heterogeneity (Turner 2015).

Model fit parameters for the fixed‐effect and random‐effects models are reported in Appendix 3. Both fixed‐effect and random‐effects models fit the data well. The between‐study heterogeneity was low. As the difference in DICs between the fixed‐effect and random‐effects models was less than 3, the simpler fixed‐effect model was chosen. Results for the fixed‐effect model are presented in Section 3.3.1.2.2. There is no potential for inconsistency in this network as there is no independent, indirect evidence for any of the comparisons.

3.3.1.2.2 NMA results

The odds ratios of all‐cause AEs, compared to FP/SAL 250/50 µg (MD‐ICS/LABA), are presented in Figure 74. The odds ratios of all‐cause AEs comparing all treatment groups against each other are reported in Table 69. Treatment with budesonide/formoterol (BUD/FM) 320/10 µg (MD‐ICS/LABA) and BUD/FM 640/10 µg (HD‐ICS/LABA) increase the odds of all‐cause AEs compared to FP/SAL 250/50 µg (MD‐ICS/LABA) (OR 1.9 [1.05 to 3.6] and 2.9 [1.3 to 6.7] respectively). Other comparisons which do not include the “null” treatment effect are highlighted in bold font in Table 69.

74.

74

Forest plot of odds ratios relative to FP/SAL 250 for all‐cause AEs for individual treatments.

Odds ratio less than one favors the comparator treatment. BUD: budesonide, Crl: credible interval, FF: fluticasone furoate, FM: formoterol, FP: fluticasone propionate, GLY: glycopyrronium, IND: indacaterol, MF: mometasone furoate, OR: odds ratio, SAL: salmeterol, Tio: tiotropium, UMEC: umeclidinium, VI: vilanterol.

51. Odds ratio for all‐cause AEs for individual treatments (fixed‐effect model).
Comparison Odds Ratio (95% CrI)
BUD/FM 320 vs. FP/SAL 250 1.912 (1.048, 3.607)
FF/VI 100 vs. FP/SAL 250 1.051 (0.770, 1.436)
MF/FM 200 vs. FP/SAL 250 1.058 (0.746, 1.503)
MF/IND 160 vs. FP/SAL 250 0.861 (0.357, 2.065)
FP/FM 250 vs. FP/SAL 250 2.177 (0.935, 5.196)
FP/SAL 200 vs. FP/SAL 250 0.899 (0.442, 1.819)
FP/SAL 500 vs. FP/SAL 250 0.944 (0.398, 2.227)
BUD/FM 640 vs. FP/SAL 250 2.885 (1.256, 6.663)
FF/VI 200 vs. FP/SAL 250 0.935 (0.631, 1.385)
MF/FM 400 vs. FP/SAL 250 1.498 (0.565, 4.177)
MF/IND 320 vs. FP/SAL 250 0.775 (0.321, 1.859)
MF/GLY/IND 80 vs. FP/SAL 250 0.773 (0.318, 1.864)
FF/UMEC/VI 100 vs. FP/SAL 250 1.063 (0.701, 1.618)
MF/GLY/IND 160 vs. FP/SAL 250 0.707 (0.291, 1.706)
FF/UMEC/VI 200 vs. FP/SAL 250 0.910 (0.597, 1.391)
FP/SAL 500 + Tio vs. FP/SAL 250 0.703 (0.283, 1.737)
FF/VI 100 vs. BUD/FM 320 0.550 (0.271, 1.083)
MF/FM 200 vs. BUD/FM 320 0.553 (0.269, 1.109)
MF/IND 160 vs. BUD/FM 320 0.449 (0.153, 1.306)
FP/FM 250 vs. BUD/FM 320 1.136 (0.629, 2.065)
FP/SAL 200 vs. BUD/FM 320 0.469 (0.183, 1.189)
FP/SAL 500 vs. BUD/FM 320 0.492 (0.170, 1.413)
BUD/FM 640 vs. BUD/FM 320 1.509 (0.851, 2.600)
FF/VI 200 vs. BUD/FM 320 0.488 (0.232, 1.002)
MF/FM 400 vs. BUD/FM 320 0.783 (0.245, 2.575)
MF/IND 320 vs. BUD/FM 320 0.404 (0.137, 1.177)
MF/GLY/IND 80 vs. BUD/FM 320 0.403 (0.136, 1.177)
FF/UMEC/VI 100 vs. BUD/FM 320 0.556 (0.261, 1.157)
MF/GLY/IND 160 vs. BUD/FM 320 0.369 (0.125, 1.078)
FF/UMEC/VI 200 vs. BUD/FM 320 0.476 (0.222, 0.994)
FP/SAL 500 +Tio vs. BUD/FM 320 0.366 (0.122, 1.090)
MF/FM 200 vs. FF/VI 100 1.006 (0.629, 1.609)
MF/IND 160 vs. FF/VI 100 0.818 (0.321, 2.073)
FP/FM 250 vs. FF/VI 100 2.071 (0.842, 5.219)
FP/SAL 200 vs. FF/VI 100 0.855 (0.393, 1.843)
FP/SAL 500 vs. FF/VI 100 0.897 (0.359, 2.230)
BUD/FM 640 vs. FF/VI 100 2.742 (1.129, 6.708)
FF/VI 200 vs. FF/VI 100 0.889 (0.698, 1.132)
MF/FM 400 vs. FF/VI 100 1.425 (0.509, 4.163)
MF/IND 320 vs. FF/VI 100 0.737 (0.289, 1.861)
MF/GLY/IND 80 vs. FF/VI 100 0.735 (0.287, 1.864)
FF/UMEC/VI 100 vs. FF/VI 100 1.012 (0.764, 1.338)
MF/GLY/IND 160 vs. FF/VI 100 0.672 (0.263, 1.705)
FF/UMEC/VI 200 vs. FF/VI 100 0.866 (0.651, 1.150)
FP/SAL 500 +Tio vs. FF/VI 100 0.668 (0.255, 1.733)
MF/IND 160 vs. MF/FM 200 0.814 (0.316, 2.085)
FP/FM 250 vs. MF/FM 200 2.057 (0.825, 5.235)
FP/SAL 200 vs. MF/FM 200 0.850 (0.385, 1.860)
FP/SAL 500 vs. MF/FM 200 0.892 (0.352, 2.248)
BUD/FM 640 vs. MF/FM 200 2.726 (1.105, 6.755)
FF/VI 200 vs. MF/FM 200 0.883 (0.522, 1.497)
MF/FM 400 vs. MF/FM 200 1.415 (0.570, 3.713)
MF/IND 320 vs. MF/FM 200 0.733 (0.284, 1.878)
MF/GLY/IND 80 vs. MF/FM 200 0.731 (0.282, 1.880)
FF/UMEC/VI 100 vs. MF/FM 200 1.005 (0.582, 1.737)
MF/GLY/IND 160 vs. MF/FM 200 0.668 (0.258, 1.723)
FF/UMEC/VI 200 vs. MF/FM 200 0.861 (0.497, 1.491)
FP/SAL 500 +Tio vs. MF/FM 200 0.665 (0.250, 1.751)
FP/FM 250 vs. MF/IND 160 2.534 (0.747, 8.695)
FP/SAL 200 vs. MF/IND 160 1.046 (0.512, 2.130)
FP/SAL 500 vs. MF/IND 160 1.097 (0.918, 1.310)
BUD/FM 640 vs. MF/IND 160 3.356 (1.002, 11.224)
FF/VI 200 vs. MF/IND 160 1.086 (0.417, 2.847)
MF/FM 400 vs. MF/IND 160 1.748 (0.470, 6.710)
MF/IND 320 vs. MF/IND 160 0.900 (0.756, 1.073)
MF/GLY/IND 80 vs. MF/IND 160 0.897 (0.735, 1.097)
FF/UMEC/VI 100 vs. MF/IND 160 1.237 (0.469, 3.277)
MF/GLY/IND 160 vs. MF/IND 160 0.822 (0.673, 1.003)
FF/UMEC/VI 200 vs. MF/IND 160 1.058 (0.401, 2.810)
FP/SAL 500 +Tio vs. MF/IND 160 0.817 (0.614, 1.086)
FP/SAL 200 vs. FP/FM 250 0.413 (0.135, 1.241)
FP/SAL 500 vs. FP/FM 250 0.433 (0.128, 1.447)
BUD/FM 640 vs. FP/FM 250 1.326 (0.583, 2.967)
FF/VI 200 vs. FP/FM 250 0.429 (0.165, 1.089)
MF/FM 400 vs. FP/FM 250 0.690 (0.186, 2.603)
MF/IND 320 vs. FP/FM 250 0.355 (0.104, 1.205)
MF/GLY/IND 80 vs. FP/FM 250 0.354 (0.103, 1.204)
FF/UMEC/VI 100 vs. FP/FM 250 0.489 (0.186, 1.251)
MF/GLY/IND 160 vs. FP/FM 250 0.324 (0.094, 1.102)
FF/UMEC/VI 200 vs. FP/FM 250 0.418 (0.159, 1.076)
FP/SAL 500 +Tio vs. FP/FM 250 0.322 (0.092, 1.113)
FP/SAL 500 vs. FP/SAL 200 1.049 (0.526, 2.096)
BUD/FM 640 vs. FP/SAL 200 3.212 (1.079, 9.581)
FF/VI 200 vs. FP/SAL 200 1.039 (0.465, 2.338)
MF/FM 400 vs. FP/SAL 200 1.671 (0.501, 5.785)
MF/IND 320 vs. FP/SAL 200 0.861 (0.423, 1.758)
MF/GLY/IND 80 vs. FP/SAL 200 0.858 (0.419, 1.768)
FF/UMEC/VI 100 vs. FP/SAL 200 1.184 (0.522, 2.701)
MF/GLY/IND 160 vs. FP/SAL 200 2.701 (0.383, 1.617)
FF/UMEC/VI 200 vs. FP/SAL 200 1.013 (0.446, 2.315)
FP/SAL 500 +Tio vs. FP/SAL 200 0.781 (0.370, 1.652)
BUD/FM 640 vs. FP/SAL 500 3.062 (0.927, 10.102)
FF/VI 200 vs. FP/SAL 500 0.991 (0.387, 2.554)
MF/FM 400 vs. FP/SAL 500 1.594 (0.434, 6.051)
MF/IND 320 vs. FP/SAL 500 0.821 (0.688, 0.980)
MF/GLY/IND 80 vs. FP/SAL 500 0.818 (0.669, 1.000)
FF/UMEC/VI 100 vs. FP/SAL 500 1.128 (0.435, 2.936)
MF/GLY/IND 160 vs. FP/SAL 500 0.750 (0.612, 0.916)
FF/UMEC/VI 200 vs. FP/SAL 500 0.965 (0.372, 2.522)
FP/SAL 500 +Tio vs. FP/SAL 500 0.745 (0.560, 0.991)
FF/VI 200 vs. BUD/FM 640 0.324 (0.129, 0.814)
MF/FM 400 vs. BUD/FM 640 0.521 (0.143, 1.947)
MF/IND 320 vs. BUD/FM 640 0.268 (0.080, 0.898)
MF/GLY/IND 80 vs. BUD/FM 640 0.267 (0.080, 0.900)
FF/UMEC/VI 100 vs. BUD/FM 640 0.368 (0.145, 0.937)
MF/GLY/IND 160 vs. BUD/FM 640 0.245 (0.073, 0.823)
FF/UMEC/VI 200 vs. BUD/FM 640 0.315 (0.124, 0.803)
FP/SAL 500 +Tio vs. BUD/FM 640 0.243 (0.071, 0.832)
MF/FM 400 vs. FF/VI 200 1.604 (0.558, 4.812)
MF/IND 320 vs. FF/VI 200 0.829 (0.316, 2.159)
MF/GLY/IND 80 vs. FF/VI 200 0.826 (0.314, 2.156)
FF/UMEC/VI 100 vs. FF/VI 200 1.138 (0.858, 1.511)
MF/GLY/IND 160 vs. FF/VI 200 0.756 (0.287, 1.975)
FF/UMEC/VI 200 vs. FF/VI 200 0.974 (0.731, 1.296)
FP/SAL 500 +Tio vs. FF/VI 200 0.752 (0.279, 2.004)
MF/IND 320 vs. MF/FM 400 0.515 (0.134, 1.916)
MF/GLY/IND 80 vs. MF/FM 400 0.514 (0.133, 1.922)
FF/UMEC/VI 100 vs. MF/FM 400 0.710 (0.234, 2.058)
MF/GLY/IND 160 vs. MF/FM 400 0.470 (0.122, 1.761)
FF/UMEC/VI 200 vs. MF/FM 400 0.607 (0.200, 1.767)
FP/SAL 500 +Tio vs. MF/FM 400 0.467 (0.120, 1.778)
MF/GLY/IND 80 vs. MF/IND 320 0.997 (0.817, 1.217)
FF/UMEC/VI 100 vs. MF/IND 320 1.373 (0.522, 3.644)
MF/GLY/IND 160 vs. MF/IND 320 0.912 (0.748, 1.113)
FF/UMEC/VI 200 vs. MF/IND 320 1.175 (0.446, 3.122)
FP/SAL 500 +Tio vs. MF/IND 320 0.907 (0.682, 1.205)
FF/UMEC/VI 100 vs. MF/GLY/IND 80 1.378 (0.521, 3.665)
MF/GLY/IND 160 vs. MF/GLY/IND 80 0.915 (0.771, 1.086)
FF/UMEC/VI 200 vs. MF/GLY/IND 80 1.179 (0.445, 3.146)
FP/SAL 500 +Tio vs. MF/GLY/IND 80 0.910 (0.718, 1.152)
MF/GLY/IND 160 vs. FF/UMEC/VI 100 0.664 (0.249, 1.758)
FF/UMEC/VI 200 vs. FF/UMEC/VI 100 0.856 (0.636, 1.150)
FP/SAL 500 +Tio vs. FF/UMEC/VI 100 0.660 (0.242, 1.784)
FF/UMEC/VI 200 vs. MF/GLY/IND 160 1.288 (0.486, 3.437)
FP/SAL 500 +Tio vs. MF/GLY/IND 160 0.994 (0.784, 1.258)
FP/SAL 500 +Tio vs. FF/UMEC/VI 200 0.772 (0.282, 2.088)

The second named treatment is the baseline intervention. Odds ratio less than one favours the first named treatment. Treatment comparisons in bold do not include the “null” effect. BUD: budesonide, Crl: credible interval, FF: fluticasone furoate, FM: formoterol, FP: fluticasone propionate, GLY: glycopyrronium, IND: indacaterol, MF: mometasone furoate, SAL: salmeterol, Tio: tiotropium, UMEC: umeclidinium, VI: vilanterol.
 

The rank plots for individual treatments are presented in Figure 75, and the mean ranks are presented in Table 70. It is very unclear which intervention is the best, as the treatment ranks are very uncertain. Except BUD/FM 640/10 µg (HD‐ICS/LABA) which has a probability of approximately 60% of being the lowest ranked treatment (median rank 17 [95% CrI  12 to 17]), none of the other treatments have even 50% probability for any of the possible ranks.

75.

75

Rank plots for individual treatments for all‐cause AEs (fixed‐effect model).

Line colors denote the treatment group. BUD: budesonide, FF: fluticasone furoate, FM: formoterol, FP: fluticasone propionate, GLY: glycopyrronium, IND: indacaterol, MF: mometasone furoate, SAL: salmeterol, Tio: tiotropium, UMEC: umeclidinium, VI: vilanterol.

52. Mean and median ranking for individual treatments for all‐cause AEs sorted by mean rank (fixed‐effect model).
Treatments Mean Rank Median Rank 95% CrI
MF/GLY/IND 160 3.78 3 (1.00, 11.00)
FP/SAL 500 +Tio 3.96 3 (1.00, 12.00)
MF/IND 320 5.62 4 (1.00, 13.00)
MF/GLY/IND 80 5.68 4 (1.00, 13.00)
FF/UMEC/VI 200 6.79 7 (1.00, 13.00)
FF/VI 200 7.20 8 (1.00, 13.00)
FP/SAL 200 7.51 7 (1.00, 15.00)
MF/IND 160 7.86 7 (3.00, 15.00)
FP/SAL 250 8.49 9 (2.00, 13.00)
MF/FM 200 9.35 10 (1.00, 14.00)
FP/SAL 500 9.49 9 (5.00, 16.00)
FF/VI 100 9.60 10 (3.00, 14.00)
FF/UMEC/VI 100 9.71 11 (2.00, 15.00)
MF/FM 400 12.23 14 (1.00, 17.00)
BUD/FM 320 14.47 15 (8.00, 16.00)
FP/FM 250 14.95 16 (7.00, 17.00)
BUD/FM 640 16.31 17 (12.00, 17.00)

BUD: budesonide, Crl: credible interval, FF: fluticasone furoate, FM: formoterol, FP: fluticasone propionate, GLY: glycopyrronium, IND: indacaterol, MF: mometasone furoate, SAL: salmeterol, Tio: tiotropium, UMEC: umeclidinium, VI: vilanterol.

3.3.2 Dropouts due to AEs
3.3.2.1 Grouped treatments

For this outcome, 12 trials (12,951 participants) comparing 4 treatment groups were included in the NMA (Figure 13). A summary of the studies included in the analysis is presented in Appendix 22.

3.3.2.1.1 Model selection and inconsistency checking

The Turner prior for adverse event outcomes comparing pharmacological interventions, i.e. a Log‐Normal (‐2.10, 1.582) prior distribution, was used for the between‐study heterogeneity (Turner 2015).

Model fit parameters for the fixed‐effect and random‐effects models are reported in Appendix 3. Both fixed‐effect and random‐effects models fit the data well. The between‐study heterogeneity was low. As the difference in DICs between the fixed‐effect and random‐effects models was less than 3, the simpler fixed‐effect model was chosen. Results for the fixed‐effect model are presented in Section 3.3.2.1.2.

A node‐splitting model was fit to assess inconsistency. The results of node‐splitting are presented in Table 71. There was evidence of inconsistency for the comparisons of HD‐ICS/LABA with MD‐ICS/LABA and HD Triple with MD Triple, which are directly linked to multiple loops in the network. Therefore, results for dropouts due to AEs for this comparison should be interpreted with caution.

53. Node‐splitting results for dropouts due to AEs for grouped treatments.
Model p LOR
(95% CrI)
HD‐ICS/LABA vs. MD‐ICS/LABA
Direct 0.003 ‐0.027
(‐0.646, 0.557)
Indirect ‐22.573
(‐71.914, ‐2.303)
Network ‐0.141
(‐0.797, 0.475)
MD Triple vs. MD‐ICS/LABA
Direct 0.405 ‐0.652
(‐2.291, 0.280)
Indirect 0.301
(‐2.064, 2.681)
Network ‐0.350
(‐1.441, 0.355)
HD Triple vs. MD‐ICS/LABA
Direct 0.840 ‐0.822
(‐2.143, 0.263)
Indirect ‐0.683
(‐2.060, 0.526)
Network ‐0.798
(‐1.688, ‐0.065)
MD Triple vs. HD‐ICS/LABA
Direct 0.117 0.210
(‐0.907, 1.247)
Indirect ‐1.158
(‐2.969, 0.269)
Network ‐0.204
(‐1.274, 0.487)
HD Triple vs. HD‐ICS/LABA
Direct 0.402 ‐0.554
(‐1.457, 0.322)
Indirect ‐1.509
(‐4.439, 0.756)
Network ‐0.660
(‐1.410, ‐0.021)
HD Triple vs. MD Triple
Direct 0.002 ‐0.588
(‐1.396, 0.300)
Indirect 23.163
(1.997, 74.056)
Network ‐0.446
(‐1.195, 0.521)

Negative LOR favours the second named treatment. Comparison in bold exhibits evidence of inconsistency. CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; LOR log odds ratio; MD: medium dose.

3.3.2.1.2 NMA results

As discussed in 3.3.2.1.1, all results in this section should be regarded with caution due to the inconsistency in the model.

The odds ratios of dropouts due to AEs are presented in Figure 76. The odds ratios of dropouts due to AEs comparing all treatment groups against each other are reported in Table 72.

76.

76

Forest plots of odds ratios for drop‐outs due to AEs for grouped treatments (fixed‐effect model).

Odds ratio less than one favors the first named treatment. Crl: credible interval, HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

54. Odds ratio for drop‐outs due to AEs for grouped treatments (fixed‐effect model).
Comparison Odds Ratio (95% CrI)
HD‐ICS/LABA vs MD‐ICS/LABA 0.911 (0.630, 1.330)
MD Triple vs. MD‐ICS/LABA 0.878 (0.531, 1.434)
HD Triple vs MD‐ICS/LABA 0.503 (0.298, 0.837)
MD Triple vs. HD‐ICS/LABA 0.964 (0.602, 1.513)
HD Triple vs HD‐ICS/LABA 0.552 (0.351, 0.849)
HD Triple vs MD Triple 0.572 (0.336, 0.976)

The second named treatment is the baseline intervention. Odds ratio less than one favours the treatment named first in the comparisons. Treatment comparisons in bold do not include the “null” effect. CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

There is evidence to suggest that treatment with HD Triple reduces the odds of dropouts due to AE compared to MD ICS/LABA, HD ICS/LABA, and MD Triple (OR 0.50 [95% CrI 0.30 to 0.84], 0.55 [0.35 to 0.85], and 0.57 [0.34 to 0.98], respectively).

An NMA summary of findings is presented in Table 18. Certainty of evidence and the interpretation of findings for HD‐ICS/LABA vs. MD‐ICS/LABA is based on the direct evidence which is rated as high certainty and contributes greater than indirect evidence in the NMA (Schünemann 2020).

The rank plots for grouped treatments are presented in Figure 77, and the mean and median ranks are presented in Table 73. HD Triple ranks higher than the other treatments (median rank 1 [95% CrI 1 to 2]).

77.

77

Rank plots for grouped treatments for dropouts due to AEs (fixed‐effect model)

HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

55. Mean and median ranking for grouped treatments for drop‐outs due to AEs sorted by mean rank (fixed‐effect model).
Treatments Mean Rank Median Rank 95% CrI
HD Triple 1.03 1.0 (1.00, 2.00)
MD Triple 2.72 3.0 (2.00, 4.00)
HD‐ICS/LABA 2.87 3.0 (2.00, 4.00)
MD‐ICS/LABA 3.38 4.0 (2.00, 4.00)

CrI: credible interval; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

3.3.2.1.3 Pairwise meta‐analysis

The evidence suggests HD triple results in a slight reduction in dropouts due to AE compared to HD‐ICS/LABA and MD‐ICS/LABA (RR 0.60 [95% CI 0.38 to 0.95]; ARR 9 fewer 1000 patients; [high certainty]) and RR 0.47 [95% CI 0.19 to 1.18]; ARR 15 fewer per 1000 patients; [high certainty], respectively) while MD triple does not. Triple therapy likely results in a slight reduction in dropouts due to AE compared to dual therapy (RR 0.59 [95% CI 0.33 to 1.03]; ARR 9 fewer per 1000 patients [moderate certainty]; Analysis 5.4Table 15).
While triple vs. dual therapy and HD Triple vs. MD‐ICS/LABA do not include the “null” effect for the fixed‐effect model (RR 0.71 [95% CI 0.51 to 0.98]; I2= 43% and RR 0.52 [95% CI 0.29 to 0.94]; I2=35%, respectively), they do for the random‐effects model.

5.4. Analysis.

5.4

Comparison 5: Serious adverse events, adverse events, and dropouts due to adverse event, Outcome 4: Dropouts due to adverse event

3.3.2.2 Individual treatments

For this outcome, 13 trials (12,230 participants) comparing 17 distinct treatments were included in the NMA (Figure 78). A summary of the studies included is presented in Appendix 23. Four studies (Kerstjens 2012aKerstjens 2012bVirchow 2019a, and Virchow 2019b) that were identified were excluded from this analysis as they were disconnected from the main network shown in Figure 78.

78.

78

Network diagram for dropouts due to AEs for individual interventions.

Node colors denote the treatment group. BUD: budesonide, FF: fluticasone furoate, FM: formoterol, FP: fluticasone propionate, GLY: glycopyrronium, IND: indacaterol, MF: mometasone furoate, SAL: salmeterol, Tio: tiotropium, UMEC: umeclidinium, VI: vilanterol.

As the data are sparse, with few studies per comparison which have very few events in each treatment arm, the results for this analysis are very uncertain.

Two three‐arm studies, Mansfield 2017 and van Zyl‐Smit 2020 reported no events. In Mansfield 2017, one arm (i.e., FP/SAL 200) reported zero events, and two arms (MF/IND 160 and MF/IND 320) reported zero events in van Zyl‐Smit 2020. The zero cells caused problem with model convergence, so we added a continuity correction of 0.5 to the two studies. When fitting this model in OpenBUGS (version 3.2.3), a less‐vague prior distribution (Normal (0, 0.01)) was used for the relative treatment effects, to make the model more stable.

3.3.2.2.1 Model selection and inconsistency checking

The Turner prior for adverse event outcomes comparing pharmacological interventions, i.e. a Log‐Normal (‐2.10, 1.582) prior distribution, was used for the between‐study heterogeneity (Turner 2015).

Model fit parameters for the fixed‐effect and random‐effects models are reported in Appendix 3. Both fixed‐effect and random‐effects models fit the data well. The between‐study heterogeneity was low, with a wider credible interval. As the difference in DICs between the fixed‐effect and random‐effects models was less than 3, the simpler fixed‐effect model was chosen. Results for the fixed‐effect model are presented in Section 3.3.2.2.2.

There is no potential for inconsistency in this network as there is no independent, indirect evidence for any of the comparisons.

3.3.2.2.2 NMA results

The odds ratios of dropouts due to AEs, compared to FP/SAL 250/50 µg (MD‐ICS/LABA), are presented in Figure 79. The odds ratios of dropouts due to AEs comparing all treatment groups against each other are reported in Table 74. There is no evidence to suggest that there is a change in odds for dropouts due to AEs for any of the individual treatments compared to FP/SAL 250/50 µg. Other comparisons which do not include the “null” treatment effect are highlighted in bold font in Table 74.

79.

79

Forest plot of odds ratios for dropouts due to AEs relative to FP/SAL 250 for dropouts due to AEs for individual treatments.

Odds ratio less than one favors the comparator treatment. BUD: budesonide, Crl: credible interval, FF: fluticasone furoate, FM: formoterol, FP: fluticasone propionate, GLY: glycopyrronium, IND: indacaterol, MF: mometasone furoate,OR: odds ratio, SAL: salmeterol, Tio: tiotropium, UMEC: umeclidinium, VI: vilanterol.

56. Odds ratio for dropouts due to AEs for individual treatments (fixed‐effect model).
Comparison Odds Ratio (95% CrI)
BUD/FM 320 vs. FP/SAL 250 0.998 (0.264, 3.664)
FF/VI 100 vs. FP/SAL 250 0.740 (0.239, 2.146)
MF/FM 200 vs. FP/SAL 250 1.277 (0.435, 4.007)
MF/IND 160 vs. FP/SAL 250 0.432 (0.038, 4.198)
FP/FM 250 vs. FP/SAL 250 0.433 (0.037, 3.724)
FP/SAL 200 vs. FP/SAL 250 0.036 (0.0002, 0.628)
FP/SAL 500 vs. FP/SAL 250 0.524 (0.050, 4.655)
BUD/FM 640 vs. FP/SAL 250 1.377 (0.296, 6.523)
FF/VI 200 vs. FP/SAL 250 0.290 (0.059, 1.280)
MF/FM 400 vs. FP/SAL 250 1.136 (0.095, 13.350)
MF/IND 320 vs. FP/SAL 250 0.384 (0.034, 3.745)
MF/GLY/IND 80 vs. FP/SAL 250 0.563 (0.050, 5.421)
FF/UMEC/VI 100 vs. FP/SAL 250 0.162 (0.017, 0.996)
MF/GLY/IND 160 vs. FP/SAL 250 0.281 (0.025, 2.775)
FF/UMEC/VI 200 vs. FP/SAL 250 0.160 (0.017, 0.992)
FP/SAL 500 +Tio vs. FP/SAL 250 0.289 (0.017, 3.881)
FF/VI 100 vs. BUD/FM 320 0.741 (0.133, 4.062)
MF/FM 200 vs. BUD/FM 320 1.284 (0.237, 7.314)
MF/IND 160 vs. BUD/FM 320 0.431 (0.027, 5.990)
FP/FM 250 vs. BUD/FM 320 0.445 (0.053, 2.405)
FP/SAL 200 vs. BUD/FM 320 0.035 (0.0001, 0.857)
FP/SAL 500 vs. BUD/FM 320 0.522 (0.035, 6.650)
BUD/FM 640 vs. BUD/FM 320 1.367 (0.643, 3.291)
FF/VI 200 vs. BUD/FM 320 0.289 (0.037, 2.102)
MF/FM 400 vs. BUD/FM 320 1.139 (0.070, 18.780)
MF/IND 320 vs. BUD/FM 320 0.382 (0.024,5.286)
MF/GLY/IND 80 vs. BUD/FM 320 0.560 (0.036, 7.725)
FF/UMEC/VI 100 vs. BUD/FM 320 0.159 (0.012, 1.547)
MF/GLY/IND 160 vs. BUD/FM 320 0.281 (0.018, 3.944)
FF/UMEC/VI 200 vs. BUD/FM 320 0.159 (0.012, 1.540)
FP/SAL 500 +Tio vs. BUD/FM 320 0.287 (0.013, 5.302)
MF/FM 200 vs. FF/VI 100 1.733 (0.380, 8.567)
MF/IND 160 vs. FF/VI 100 0.584 (0.041, 7.346)
FP/FM 250 vs. FF/VI 100 0.585 (0.040, 6.765)
FP/SAL 200 vs. FF/VI 100 0.048 (0.0002, 1.082)
FP/SAL 500 vs. FF/VI 100 0.709 (0.053, 8.184)
BUD/FM 640 vs. FF/VI 100 1.871 (0.288, 12.670)
FF/VI 200 vs. FF/VI 100 0.396 (0.123, 1.090)
MF/FM 400 vs. FF/VI 100 1.542 (0.105, 23.090)
MF/IND 320 vs. FF/VI 100 0.519 (0.036, 6.544)
MF/GLY/IND 80 vs. FF/VI 100 0.761 (0.054, 9.456)
FF/UMEC/VI 100 vs. FF/VI 100 0.224 (0.031, 0.927)
MF/GLY/IND 160 vs. FF/VI 100 0.381 (0.026, 4.827)
FF/UMEC/VI 200 vs. FF/VI 100 0.223 (0.031, 0.924)
FP/SAL 500 +Tio vs. FF/VI 100 0.391 (0.019, 6.641)
MF/IND 160 vs. MF/FM 200 0.335 (0.023, 4.179)
FP/FM 250 vs. MF/FM 200 0.337 (0.023, 3.791)
FP/SAL 200 vs. MF/FM 200 0.027 (0.0001, 0.608)
FP/SAL 500 vs. MF/FM 200 0.406 (0.030, 4.673)
BUD/FM 640 vs. MF/FM 200 1.072 (0.158, 7.145)
FF/VI 200 vs. MF/FM 200 0.224 (0.032, 1.427)
MF/FM 400 vs. MF/FM 200 0.884 (0.093, 8.140)
MF/IND 320 vs. MF/FM 200 0.297 (0.020, 3.727)
MF/GLY/IND 80 vs. MF/FM 200 0.435 (0.030, 5.363)
FF/UMEC/VI 100 vs. MF/FM 200 0.125 (0.010, 1.049)
MF/GLY/IND 160 vs. MF/FM 200 0.218 (0.015, 2.755)
FF/UMEC/VI 200 vs. MF/FM 200 0.124 (0.011, 1.048)
FP/SAL 500 +Tio vs. MF/FM 200 0.224 (0.011, 3.779)
FP/FM 250 vs. MF/IND 160 1.001 (0.037, 26.680)
FP/SAL 200 vs. MF/IND 160 0.082 (0.0003, 2.170)
FP/SAL 500 vs. MF/IND 160 1.206 (0.654, 2.247)
BUD/FM 640 vs. MF/IND 160 3.217 (0.208, 56.650)*
FF/VI 200 vs. MF/IND 160 0.667 (0.042, 11.580)
MF/FM 400 vs. MF/IND 160 2.659 (0.091, 84.700)*
MF/IND 320 vs. MF/IND 160 0.888 (0.455, 1.712)
MF/GLY/IND 80 vs. MF/IND 160 1.299 (0.712, 2.405)
FF/UMEC/VI 100 vs. MF/IND 160 0.366 (0.016, 7.836)
MF/GLY/IND 160 vs. MF/IND 160 0.653 (0.319, 1.311)
FF/UMEC/VI 200 vs. MF/IND 160 0.365 (0.016, 7.867)
FP/SAL 500 +Tio vs. MF/IND 160 0.684 (0.131, 2.794)
FP/SAL 200 vs. FP/FM 250 0.079 (0.0003, 3.709)
FP/SAL 500 vs. FP/FM 250 1.207 (0.048, 30.870)
BUD/FM 640 vs. FP/FM 250 3.139 (0.482, 30.040)
FF/VI 200 vs. FP/FM 250 0.668 (0.045, 11.700)
MF/FM 400 vs. FP/FM 250 2.653 (0.099, 84.660)*
MF/IND 320 vs. FP/FM 250 0.888 (0.033, 23.970)
MF/GLY/IND 80 vs. FP/FM 250 1.305 (0.049, 35.030)
FF/UMEC/VI 100 vs. FP/FM 250 0.367 (0.017, 7.834)
MF/GLY/IND 160 vs. FP/FM 250 0.654 (0.024, 17.880)
FF/UMEC/VI 200 vs. FP/FM 250 0.365 (0.017, 7.886)
FP/SAL 500 +Tio vs. FP/FM 250 0.672 (0.019, 22.980)
FP/SAL 500 vs. FP/SAL 200 14.560 (0.595, 3358)*
BUD/FM 640 vs. FP/SAL 200 39.890 (1.448, 9944)*
FF/VI 200 vs. FP/SAL 200 8.274 (0.295, 2017)*
MF/FM 400 vs. FP/SAL 200 34.560 (0.684, 11170)*
MF/IND 320 vs. FP/SAL 200 10.740 (0.410, 2534)*
MF/GLY/IND 80 vs. FP/SAL 200 15.800 (0.606, 3707)*
FF/UMEC/VI 100 vs. FP/SAL 200 4.603 (0.116, 1234)*
MF/GLY/IND 160 vs. FP/SAL 200 7.914 (0.297, 1863)*
FF/UMEC/VI 200 vs. FP/SAL 200 4.583 (0.115, 1239)*
FP/SAL 500 +Tio vs. FP/SAL 200 8.346 (0.227, 2184)*
BUD/FM 640 vs. FP/SAL 500 2.655 (0.186, 44.82)
FF/VI 200 vs. FP/SAL 500 0.550 (0.038, 9.071)
MF/FM 400 vs. FP/SAL 500 2.201 (0.080, 66.500)*
MF/IND 320 vs. FP/SAL 500 0.737 (0.386, 1.380)
MF/GLY/IND 80 vs. FP/SAL 500 1.076 (0.604, 1.933)
FF/UMEC/VI 100 vs. FP/SAL 500 0.302 (0.014, 6.159)
MF/GLY/IND 160 vs. FP/SAL 500 0.542 (0.270, 1.059)
FF/UMEC/VI 200 vs. FP/SAL 500 0.303 (0.014, 6.152)
FP/SAL 500 +Tio vs. FP/SAL 500 0.567 (0.110, 2.288)
FF/VI 200 vs. BUD/FM 640 0.208 (0.023, 1.777)
MF/FM 400 vs. BUD/FM 640 0.820 (0.045, 15.230)
MF/IND 320 vs. BUD/FM 640 0.275 (0.015, 4.245)
MF/GLY/IND 80 vs. BUD/FM 640 0.404 (0.023, 6.212)
FF/UMEC/VI 100 vs. BUD/FM 640 0.115 (0.008, 1.276)
MF/GLY/IND 160 vs. BUD/FM 640 0.202 (0.011, 3.165)
FF/UMEC/VI 200 vs. BUD/FM 640 0.114 (0.008, 1.270)
FP/SAL 500 +Tio vs. BUD/FM 640 0.208 (0.008, 4.223)
MF/FM 400 vs. FF/VI 200 3.941 (0.222, 73.760)*
MF/IND 320 vs. FF/VI 200 1.333 (0.076, 21.060)
MF/GLY/IND 80 vs. FF/VI 200 1.950 (0.112, 30.490)
FF/UMEC/VI 100 vs. FF/VI 200 0.565 (0.071, 2.938)
MF/GLY/IND 160 vs. FF/VI 200 0.978 (0.055, 15.580)
FF/UMEC/VI 200 vs. FF/VI 200 0.565 (0.071, 2.935)
FP/SAL 500 +Tio vs. FF/VI 200 1.002 (0.040, 21.050)
MF/IND 320 vs. MF/FM 400 0.333 (0.011, 9.713)
MF/GLY/IND 80 vs. MF/FM 400 0.488 (0.016, 14.170)
FF/UMEC/VI 100 vs. MF/FM 400 0.139 (0.005, 3.022)
MF/GLY/IND 160 vs. MF/FM 400 0.244 (0.008, 7.258)
FF/UMEC/VI 200 vs. MF/FM 400 0.138 (0.005, 3.057)
FP/SAL 500 +Tio vs. MF/FM 400 0.251 (0.006, 9.248)
MF/GLY/IND 80 vs. MF/IND 320 1.463 (0.788, 2.773)
FF/UMEC/VI 100 vs. MF/IND 320 0.412 (0.018, 8.829)
MF/GLY/IND 160 vs. MF/IND 320 0.736 (0.354, 1.502)
FF/UMEC/VI 200 vs. MF/IND 320 0.412 (0.018, 8.908)
FP/SAL 500 +Tio vs. MF/IND 320 0.771 (0.147, 3.188)
FF/UMEC/VI 100 vs. MF/GLY/IND 80 0.281 (0.012, 6.043)
MF/GLY/IND 160 vs. MF/GLY/IND 80 0.504 (0.260, 0.937)
FF/UMEC/VI 200 vs. MF/GLY/IND 80 0.281 (0.012, 6.009)
FP/SAL 500 +Tio 5 vs. MF/GLY/IND 80 0.529 (0.109, 1.941)
MF/GLY/IND 160 vs. FF/UMEC/VI 100 1.787 (0.081, 41.780)
FF/UMEC/VI 200 vs. FF/UMEC/VI 100 1.000 (0.107, 9.359)
FP/SAL 500 +Tio vs. FF/UMEC/VI 100 1.831 (0.062, 54.540)*
FF/UMEC/VI 200 vs. MF/GLY/IND 160 0.560 (0.024, 12.210)
FP/SAL 500 +Tio vs. MF/GLY/IND 160 1.052 (0.210, 4.076)
FP/SAL 500 +Tio vs. FF/UMEC/VI 200 1.837 (0.062, 54.250)*

The second named treatment is the baseline intervention. Odds ratio less than one favours the treatment named first in the comparisons. Treatment comparisons in bold do not include the “null” effect. *ORs are extremely uncertain due to network sparsity and should be interpreted with caution. BUD: budesonide,Crl: credible interval, FF: fluticasone furoate, FM: formoterol, FP: fluticasone propionate, GLY: glycopyrronium, IND: indacaterol, MF: mometasone furoate, OR: odds ratio, SAL: salmeterol, Tio: tiotropium, UMEC: umeclidinium, VI: vilanterol.

While the ORs and their corresponding 95% CrIs comparing all treatments to FP/SAL 250/50 µg were reasonable, the ORs for some comparisons (shown in Table 74) had very wide credible intervals that effectively meant that the ORs were extremely uncertain due to the scarcity of data to make the comparisons.

The rank plots for individual treatments are presented in Figure 80, and the mean ranks are presented in Table 75. It was very unclear which treatment was best, as treatment ranks are very uncertain. Except FP/SAL 200/12.5 µg (MD‐ICS/LABA), all the treatments had probabilities much lower than 50% for each of the possible treatment ranks. While FP/SAL 200/12.5 µg has the highest probability (over 50%) of being the best treatment (median rank 1 [95% CrI 1 to 10]), all evidence for this treatment is obtained from a single study (Mansfield 2017), where no events were observed in the FP/SAL 200/12.5 µg treatment arm and the 95% CrI is very wide. The ranking results therefore should be interpreted with caution.

80.

80

Rank plots for individual treatments for dropouts due to AEs (fixed‐effect model).

Line colors denote the treatment group. BUD: budesonide, FF: fluticasone furoate, FM: formoterol, FP: fluticasone propionate, GLY: glycopyrronium, IND: indacaterol, MF: mometasone furoate, SAL: salmeterol, Tio: tiotropium, UMEC: umeclidinium, VI: vilanterol.

57. Mean and median ranking for individual treatments for dropouts due to AEs sorted by mean rank (fixed‐effect model).
Treatments Mean Rank Median Rank 95% Credible Interval
FP/SAL 200 2.27 1.0 (1.0, 10.0)
FF/UMEC/VI 200 4.73 3.0 (1.0, 13.0)
FF/UMEC/VI 100 4.74 3.0 (1.0, 13.0)
MF/GLY/IND 160 5.88 5.0 (1.0, 13.0)
FF/VI 200 6.72 6.0 (2.0, 14.0)
FP/SAL 500 +Tio 6.81 6.0 (1.0, 17.0)
MF/IND 320 7.82 7.0 (2.0, 15.0)
FP/FM 250 8.45 8.0 (1.0, 17.0)
MF/IND 160 8.71 8.0 (3.0, 16.0)
FP/SAL 500 10.18 10.0 (4.0, 17.0)
MF/GLY/IND 80 10.77 10.0 (5.0, 17.0)
FF/VI 100 11.16 12.0 (5.0, 17.0)
MF/FM 400 12.29 14.0 (2.0, 17.0)
BUD/FM 320 12.30 13.0 (5.0, 17.0)
FP/SAL 250 12.69 13.0 (7.0, 17.0)
MF/FM 200 13.63 14.0 (6.0, 17.0)
BUD/FM 640 13.85 15.0 (6.0, 17.0)

BUD: budesonide, FF: fluticasone furoate, FM: formoterol, FP: fluticasone propionate, GLY: glycopyrronium, IND: indacaterol, MF: mometasone furoate, SAL: salmeterol, Tio: tiotropium, UMEC: umeclidinium, VI: vilanterol.

Discussion

Summary of main results

We included 17,161 adolescents and adults with uncontrolled asthma who were eligible or had been treated with medium‐dose inhaled corticosteroids long‐acting beta2‐agonist (MD‐ICS/LABA) from 17 studies (median duration 26 weeks; mean age 49.1 years; male 40%; white 81%; mean forced expiratory volume in 1 second (FEV1) 1.9 litres and 61% predicted). The quality of included studies was generally good except for some outcomes in a few studies due to high attrition rates (Figure 15).

Medium‐dose (MD) and high‐dose (HD) triple therapies reduce steroid‐requiring (moderate to severe) asthma exacerbations (Hazard ratio (HR) 0.84 [95% Credible interval (CrI)0.71 to 0.99] and 0.69 [0.58 to 0.82], respectively [high certainty]), but not asthma‐related hospitalisations, compared to MD‐ICS/LABA. High‐dose triple therapy likely reduces steroid‐requiring asthma exacerbations compared to MD triple therapy (HR 0.83 [95% CrI 0.69 to 0.996], [moderate certainty]). Subgroup analyses suggest the reduction in steroid‐requiring exacerbations associated with triple therapies may be only for those with a history of asthma exacerbations in the previous year, but not for those without.

High‐dose triple therapy, but not MD‐triple, results in a reduction in all‐cause adverse events (AEs) and likely reduces dropouts due to AEs compared to MD‐ICS/LABA (OR 0.79 [95% CrI 0.69 to 0.90], [high certainty] and 0.50 [95% CrI 0.30 to 0.84], [moderate certainty], respectively). Triple therapy results in little to no difference in all‐cause or asthma‐related serious adverse events(SAEs) compared to dual therapy [high certainty].

The impact of triple therapy compared to dual therapy is less clear on symptom and quality of life scores. The network meta‐analyses (NMA) evidence suggests HD triple increases the odds of Asthma Control Questionnaire (ACQ) responder at six and 12 months (odds ratio (OR) 1.25, 95% CrI 1.07 to 1.45), [ow certainty and 1.08 (95%CrI 1.02 to 1.14), moderate certainty, respectively compared to MD‐ICS/LABA and MD Triple also does at six months (OR 1.25 [95%CrI 1.09 to 1.44], low certainty), but not at 12 months (OR 0.99 [95% CrI 0.94 to 1.05], [moderate certainty]). However, theNMAs suggest no clinically important difference in symptoms or quality of life comparing HD or MD Triple to MD‐ICS/LABA considering the minimal clinically important differences (MCIDs) [very low to moderate certainty].

The evidence suggests HD‐ICS/LABA is unlikely to result in any significant benefit or harm compared to MD‐ICS/LABA.

The evidence that any specific formulation would be better than the others within the same group in any outcomes is uncertain due to the scarcity of data and resulting imprecision of estimates.

Overall completeness and applicability of evidence

The evidence suggests little or no difference in the safety outcomes comparing HD‐ICS/LABA to MD‐ICS/LABA. However, long‐term side effects of higher ICS doses need to be addressed in phase 4 or observational studies as the maximum study duration of the included studies was 12 months, and available evidence suggests medium‐ and high‐ ICS doses are associated with increased risk of clinically important systemic side effects compared to low‐ICS doses. (Beasley 2019).

Our results may not be applicable to active smokers as they were excluded in the included studies and cigarette smoking is known to impair the efficacy of ICS treatment (Shimoda 2016).

Clinical trials for triple combination therapies included in this review did not include adolescents. The efficacy and safety of LAMAs for adolescents have not been established except for tiotropium soft mist inhaler. Although the efficacy and safety of tiotropium soft mist inhaler as add‐on to ICS, with or without another maintenance therapy, such as LABA, in the adolescent is similar to those in the adult (Hamelmann 2017), the results regarding triple combination therapies in this review may or may not be applicable to the adolescent.

A post hoc analysis in Lee 2020 showed HD‐ICS containing groups had greater improvements in both FEV1 and annualised rates of moderate to severe exacerbations in participants with higher blood eosinophils and fractional exhaled nitric oxide at baseline than did MD‐ICS containing groups. A previous meta‐analysis showed that treatment tailored using type 2 biomarkers resulted in fewer asthma exacerbations compared with traditional management but did not impact final daily ICS doses (Petsky 2018). Although, this review suggests HD‐ICS containing combinations provide no additional benefits compared with MD‐ICS combinations in the population studied, the optimal approach to ICS dosing in participants with the biomarker‐high phenotype remains to be established with further studies.

Quality of the evidence

The quality of included studies was generally good except for some outcomes in a few studies due to high attrition rates (i.e., change from baseline (CFB) in ACQ scores at 12 months in Lee 2020 and ACQ responders at 6 and 12 months in van Zyl‐Smit 2020Figure 15). The certainty of evidence varied from very low to high which is presented in the interpretation of findings and summary of findings tables.

Potential biases in the review process

The proportions of participants who had a history of asthma exacerbation in the previous year were 33% and 60% in MD‐ and HD‐ICS/LABA groups, respectively and those in the triple therapy groups were much higher and 85% and 90% in MD and HD Triple (Table 20). This clinical heterogeneity would raise a concern for intransitivity especially for exacerbation outcomes. As the matter of fact, subgroup analyses suggest that MD and HD triples reduce moderate to severe exacerbations only for those with a history of asthma exacerbation in the previous year but not for those without. The results of pairwise analyses are qualitatively similar to those of the network meta‐analysis (NMA) and suggest that triple therapy reduces moderate to severe (steroid‐requiring) exacerbations compared to dual therapy for those with a history of exacerbation but not for those without (risk ratio (RR) 0.84 [95% CI 0.77 to 0.92] and 0.96 [0.72 to 1.20], respectively Analysis 7.7).

Agreements and disagreements with other studies or reviews

The results in this study differ in several aspects from other studies. One study included children but did not include Gessner 2020 (Kim 2021) and another study included only five studies (Rogliani 2021) while this study included 17 studies excluding children. We did not include children because the response to different ICS strengths may differ in children and indirectness could cause a significant bias if adults and children are combined and analysed together in a meta‐analysis.

This study included both pairwise and network meta‐analyses to assure the robustness whereas the others conducted either a pairwise meta‐analysis (Kim 2021) or an NMA only (Rogliani 2021). We analysed the impact of medium versus a high dose of ICS in combination therapies because of a concern for increased side effects with higher dose ICS, whereas one of the previous studies did not consider the impact of different ICS strengths in combination therapies (Kim 2021).

The definitions of asthma exacerbation varied from study to study. We classified asthma exacerbations requiring systemic corticosteroids as moderate and requiring a hospitalisation as severe.

The results on steroid‐requiring (moderate exacerbations in this study, which was defined as severe exacerbation in the others, are qualitatively similar to those in the others (Kim 2021Rogliani 2021) except for MD triple versus. MD‐ICS/LABA. This study suggested that both MD and HD triple were likely superior to MD‐ICS/LABA in reducing steroid‐requiring asthma exacerbations, both in the pairwise meta‐analysis and NMA (moderate certainty), whereas the superiority of MD triple over MD‐ICS/LABA was not confirmed in another study (Rogliani 2021). The difference could be due to data sources. We obtained the data through Clinical Study Report reported by the manufacturer forLee 2020 and personal communications with the manufacturer for Virchow 2019a.

A moderate exacerbation was generally defined in each trial as a progressive increase in one or more asthma symptoms or a decline in lung function for two or more consecutive days that did not meet the definition of severe asthma exacerbation and one study reported a reduced risk of moderate to severe exacerbations (RR 0.79 [95% CrI 0.65 to 0.94]) comparing HD‐ICS/LABA to MD‐ICS/LABA using the above definition (Rogliani 2021) while this study did not include such outcome because it was felt that other types of exacerbation were clinically more relevant. This study suggests HD‐ICS/LABA is unlikely to provide any additional benefit compared to MD‐ICS/LABA otherwise.

None of the previous studies reported asthma‐related hospitalisations, while this study did include them to better inform various stakeholders and found triple therapy was unlikely to reduce them compared to dual therapy.

We took MCIDs into consideration for the interpretations of continuous outcomes and found no clinically important difference between triple and dual therapies while others concluded that triple therapy was “effective in uncontrolled asthma” and “associated with modest improvement in asthma control” compared with dual therapy based on statistical differences (Kim 2021Rogliani 2021), which may not be of clinical importance.
In this study, HD triple results in a reduction in all‐cause AEs and likely reduces dropouts due to AEs compared to MD‐ICS/LABA, whereas the previous study reported “triple therapy was significantly associated with increased dry mouth and dysphonia compared to dual therapy” (Kim 2021). The results on SAEs were qualitatively similar between ours and the others’ concluding that triple therapy resulted in little to no difference compared to dual therapy.

Authors' conclusions

Implications for practice.

Medium‐dose (MD) and high‐dose (HD)triple therapies reduce steroid‐requiring (moderate to severe) asthma exacerbations, but not asthma‐related hospitalisations, compared to medium‐dose inhaled corticosteroids long‐acting beta2‐agonist (MD‐ICS/LABA)MD‐ICS/LABA) especially in those with a history of asthma exacerbations. High‐dose triple therapy is likely superior to MD triple therapy in reducing steroid‐requiring asthma exacerbations.

Triple therapy is unlikely to result in clinically meaningful improvement in symptoms or quality of life compared to dual therapy considering the minimal clinically important differences (MCIDs).

HD triple therapy, but not MD triple, results in a reduction in all‐cause adverse events (AEs) and likely reduces dropouts due to AEs compared to MD‐ICS/LABA. Triple therapy results in little to no difference in all‐cause or asthma‐related SAEs compared to dual therapy.

HD‐ICS/LABA is unlikely to result in any significant benefit or harm compared to MD‐ICS/LABA.

Above findings would help to guide the choice of treatment when asthma is not controlled with MD‐ICS/LABA.

Implications for research.

Long‐term side effects of high‐dose dual and triple combination therapies need to be addressed in phase 4 or observational studies as the maximum duration of included studies was 12 months. Studies including active smokers are also needed.

History

Protocol first published: Issue 11, 2020

Risk of bias

Risk of bias for analysis 7.1 HD‐ICS/LABA vs MD‐ICS/LABA.

Study Bias
Randomisation process Deviations from intended interventions Missing outcome data Measurement of the outcome Selection of the reported results Overall
Authors' judgement Support for judgement Authors' judgement Support for judgement Authors' judgement Support for judgement Authors' judgement Support for judgement Authors' judgement Support for judgement Authors' judgement Support for judgement
Subgroup 7.1.1 High Risk
Kerstjens 2020 Low risk of bias No significant issues Low risk of bias No significant issues Low risk of bias No significant issues Low risk of bias No significant issues Low risk of bias No significant issues Low risk of bias No significant issues
Subgroup 7.1.2 Low Risk
Bernstein 2015 Low risk of bias No significant issues Low risk of bias No significant issues Low risk of bias No significant issues Low risk of bias No significant issues Low risk of bias No significant issues Low risk of bias No significant issues
Lee 2020 Low risk of bias No significant issues Low risk of bias No significant issues Low risk of bias No significant issues Low risk of bias No significant issues Low risk of bias No significant issues Low risk of bias No significant issues
Mansfield 2017 Low risk of bias No significant issues Some concerns Open label study Low risk of bias No significant issues Low risk of bias No significant issues Low risk of bias No significant issues Some concerns Open label study
Peters 2008 Low risk of bias No significant issues Low risk of bias No significant issues Low risk of bias No significant issues Low risk of bias No significant issues Low risk of bias No significant issues Low risk of bias No significant issues
van Zyl‐Smit 2020 Low risk of bias No significant issues Low risk of bias No significant issues Low risk of bias No significant issues Low risk of bias No significant issues Low risk of bias No significant issues Low risk of bias No significant issues

Acknowledgements

We thank Elizabeth Stovold for assisting with the search strategy.

The Background and Methods sections of this review are based on a standard template used by Cochrane Airways.

The authors and Cochrane Airways’ Editorial Team are grateful to the following peer and consumer reviewers for their time and comments:

Richard N van Zyl‐Smit, University of Cape Town Lung Institute (South Africa); Ian Pavord, University of Oxford (UK); Alexis Aningalan (USA); and Jefferson Antonio Buendia Rodriguez, Universidad de Antioquia (Columbia).

This project was supported by the National Institute for Health and Care Research, via Cochrane Infrastructure funding to Cochrane Airways. The views and opinions expressed therein are those of the authors and do not necessarily reflect those of the Systematic Reviews Programme, NIHR, NHS or the Department of Health and Social Care.

Appendices

Appendix 1. Database search strategies

Database/search platform/date of last search Search strategy Results
Airways Register (via Cochrane Register of Studies)
Date of most recent search: 1 December 2020 #1 MESH DESCRIPTOR Asthma EXPLODE ALL AND INSEGMENT
#2 asthma*:ti,ab AND INSEGMENT
#3 #1 OR #2
#4 MESH DESCRIPTOR Formoterol Fumarate AND INSEGMENT
#5 MESH DESCRIPTOR Salmeterol Xinafoate AND INSEGMENT
#6 formoterol:ti,ab AND INSEGMENT
#7 salmeterol:ti,ab AND INSEGMENT
#8 indacaterol:ti,ab AND INSEGMENT
#9 vilanterol:ti,ab AND INSEGMENT
#10 #4 OR #5 OR #6 OR #7 OR #8 OR #9
#11 MESH DESCRIPTOR Budesonide AND INSEGMENT
#12 MESH DESCRIPTOR Fluticasone AND INSEGMENT
#13 MESH DESCRIPTOR Beclomethasone AND INSEGMENT
#14 budesonide:ti,ab AND INSEGMENT
#15 fluticasone:ti,ab AND INSEGMENT
#16 mometasone:ti,ab AND INSEGMENT
#17 beclomethasone:ti,ab AND INSEGMENT
#18 ciclesonide:ti,ab AND INSEGMENT
#19 (inhal* NEAR3 (steroid* or corticosteroid* or glucocorticoid*)):ti,ab AND INSEGMENT
#20 #11 OR #12 OR #13 OR #14 OR #15 OR #16 OR #17 OR #18 OR #19
#21 MESH DESCRIPTOR Budesonide, Formoterol Fumarate Drug Combination AND INSEGMENT
#22 MESH DESCRIPTOR Mometasone Furoate, Formoterol Fumarate Drug Combination AND INSEGMENT
#23 MESH DESCRIPTOR Fluticasone‐Salmeterol Drug Combination AND INSEGMENT
#24 #21 OR #22 OR #23
#25 #3 AND #10 AND #20
#26 #3 AND #24
#27 #25 OR #26
#28 (2008 or 2009 or 2010 or 2011 or 2012 or 2013 or 2014 or 2015 or 2016 or 2017 or 2018 or 2019 or 2020):yr AND INSEGMENT
#29 #27 AND #28
#30 INREGISTER
#31 #29 AND #30 Dec 2020=915
CENTRAL (via Cochrane Register of Studies)
Date of most recent search: 1 December 2020 #1 MESH DESCRIPTOR Asthma EXPLODE ALL AND CENTRAL:TARGET
#2 asthma*:ti,ab AND CENTRAL:TARGET
#3 #1 OR #2 AND CENTRAL:TARGET
#4 MESH DESCRIPTOR Formoterol Fumarate AND CENTRAL:TARGET
#5 MESH DESCRIPTOR Salmeterol Xinafoate AND CENTRAL:TARGET
#6 formoterol:ti,ab AND CENTRAL:TARGET
#7 salmeterol:ti,ab AND CENTRAL:TARGET
#8 indacaterol:ti,ab AND CENTRAL:TARGET
#9 vilanterol:ti,ab AND CENTRAL:TARGET
#10 #4 OR #5 OR #6 OR #7 OR #8 OR #9 AND CENTRAL:TARGET
#11 MESH DESCRIPTOR Budesonide AND CENTRAL:TARGET
#12 MESH DESCRIPTOR Fluticasone AND CENTRAL:TARGET
#13 MESH DESCRIPTOR Beclomethasone AND CENTRAL:TARGET
#14 budesonide:ti,ab AND CENTRAL:TARGET
#15 fluticasone:ti,ab AND CENTRAL:TARGET
#16 mometasone:ti,ab AND CENTRAL:TARGET
#17 beclomethasone:ti,ab AND CENTRAL:TARGET
#18 ciclesonide:ti,ab AND CENTRAL:TARGET
#19 (inhal* NEAR3 (steroid* or corticosteroid* or glucocorticoid*)):ti,ab AND CENTRAL:TARGET
#20 #11 OR #12 OR #13 OR #14 OR #15 OR #16 OR #17 OR #18 OR #19 AND CENTRAL:TARGET
#21 MESH DESCRIPTOR Budesonide, Formoterol Fumarate Drug Combination AND CENTRAL:TARGET
#22 MESH DESCRIPTOR Mometasone Furoate, Formoterol Fumarate Drug Combination AND CENTRAL:TARGET
#23 MESH DESCRIPTOR Fluticasone‐Salmeterol Drug Combination AND CENTRAL:TARGET
#24 #21 OR #22 OR #23 AND CENTRAL:TARGET
#25 #3 AND #10 AND #20 AND CENTRAL:TARGET
#26 #3 AND #24 AND CENTRAL:TARGET
#27 #25 OR #26 AND CENTRAL:TARGET
#28 (2008 or 2009 or 2010 or 2011 or 2012 or 2013 or 2014 or 2015 or 2016 or 2017 or 2018 or 2019 or 2020):yr AND CENTRAL:TARGET
#29 #27 AND #28 AND CENTRAL:TARGET Dec 2020=1665
MEDLINE (Ovid) ALL
Date of most recent search: 1 December 2020 1 exp Asthma/ 
2 asthma$.tw. 
3 1 or 2 
4 Formoterol Fumarate/ 
5 Salmeterol Xinafoate/ 
6 formoterol.tw. 
7 salmeterol.tw. 
8 indacaterol.mp. 
9 vilanterol.mp. 
10 or/4‐9 
11 Budesonide/ 
12 Fluticasone/ 
13 Mometasone Furoate/ 
14 Beclomethasone/ 
15 budesonide.tw. 
16 fluticasone.tw. 
17 mometasone.tw. 
18 beclomethasone.tw. 
19 ciclesonide.mp. 
20 (inhal$ adj3 (steroid$ or corticosteroid$ or glucocorticoid$)).tw. 
21 or/11‐20 
22 Budesonide, Formoterol Fumarate Drug Combination/ 
23 Mometasone Furoate, Formoterol Fumarate Drug Combination/ 
24 Fluticasone‐Salmeterol Drug Combination/ 
25 or/22‐24 
26 3 and 10 and 21 
27 3 and 25 
28 26 or 27 
29 (controlled clinical trial or randomized controlled trial).pt. 
30 (randomized or randomised).ab,ti. 
31 placebo.ab,ti. 
32 dt.fs. 
33 randomly.ab,ti. 
34 trial.ab,ti. 
35 groups.ab,ti. 
36 or/29‐35 
37 Animals/ 
38 Humans/ 
39 37 not (37 and 38) 
40 36 not 39 
41 28 and 40 
42 limit 41 to yr="2008 ‐Current" Dec 2020=993
Embase (Ovid)
Date of most recent search: 1 December 2020 1 exp asthma/ 
2 asthma$.tw. 
3 1 or 2 
4 formoterol fumarate/ 
5 salmeterol xinafoate/ 
6 formoterol.tw. 
7 salmeterol.tw. 
8 indacaterol.mp. 
9 vilanterol.mp. 
10 or/4‐9 
11 budesonide/ 
12 fluticasone/ 
13 mometasone furoate/ 
14 beclometasone/ 
15 budesonide.tw. 
16 fluticasone.tw. 
17 mometasone.tw. 
18 beclomethasone.tw. 
19 ciclesonide.mp. 
20 (inhal$ adj3 (steroid$ or corticosteroid$ or glucocorticoid$)).tw. 
21 or/11‐20 
22 budesonide plus formoterol/ 
23 formoterol fumarate plus mometasone furoate/ 
24 exp fluticasone propionate plus salmeterol/ 
25 or/22‐24 
26 3 and 10 and 21 
27 3 and 25 
28 26 or 27 
29 Randomized Controlled Trial/ 
30 randomization/ 
31 controlled clinical trial/ 
32 Double Blind Procedure/ 
33 Single Blind Procedure/ 
34 Crossover Procedure/ 
35 (clinica$ adj3 trial$).tw. 
36 ((singl$ or doubl$ or trebl$ or tripl$) adj3 (mask$ or blind$ or method$)).tw. 
37 exp Placebo/ 
38 placebo$.ti,ab. 
39 random$.ti,ab. 
40 ((control$ or prospectiv$) adj3 (trial$ or method$ or stud$)).tw. 
41 (crossover$ or cross‐over$).ti,ab. 
42 or/29‐41 
43 exp animals/ or exp invertebrate/ or animal experiment/ or animal model/ or animal tissue/ or animal cell/ or nonhuman/ 
44 human/ or normal human/ or human cell/ 
45 43 and 44 
46 43 not 45 
47 42 not 46 
48 28 and 47 
49 limit 48 to yr="2008 ‐Current" Dec 2020=1758
Global Health (Ovid)
Date of most recent search: 1 December 2020 1 exp asthma/ 
2 asthma$.tw. 
3 1 or 2 
4 formoterol.tw. 
5 salmeterol.tw. 
6 indacaterol.mp. 
7 vilanterol.mp. 
8 4 or 5 or 6 or 7 
9 exp corticoids/ 
10 budesonide.tw. 
11 fluticasone.tw. 
12 mometasone.tw. 
13 beclomethasone.tw. 
14 ciclesonide.mp. 
15 (inhal$ adj3 (steroid$ or corticosteroid$ or glucocorticoid$)).tw. 
16 or/9‐15 
17 3 and 8 and 16 
18 randomized controlled trials/ 
19 (randomized or randomised).ab,ti. 
20 placebo.ab,ti. 
21 randomly.ab,ti. 
22 trial.ab,ti. 
23 or/18‐22 
24 17 and 23 
25 limit 24 to yr="2008 ‐Current" Dec 2020=32
ClinicalTrials.gov
Date of most recent search: 1 December 2020 Study type: Interventional
Condition: asthma
Intervention: (formoterol OR salmeterol OR indacaterol OR vilanterol) AND (budesonide OR fluticasone OR mometasone OR beclomethasone OR ciclesonide)
Dec 2020=270

Appendix 2. Data table for studies included for severe exacerbations

Dichotomous Data
Study Treatment N n of participants with the event
Bernstein 2015*
(low risk group)
MD‐ICS/LABA 346 0
HD‐ICS/LABA 346 0
Kerstjens 2012
(high risk group)
HD‐ICS/LABA 456 20
HD Triple 457 16
Lee 2020
(low risk group)
MD‐ICS/LABA 407 7
HD‐ICS/LABA 406 5
MD Triple 406 7
HD Triple 408 4
Mansfield 2017
(low risk group)
MD‐ICS/LABA 174 2
HD‐ICS/LABA 44 0
Peters 2008
(low risk group)
MD‐ICS/LABA 132 2
HD‐ICS/LABA 443 2
Stempel 2016
(high risk group)
MD‐ICS/LABA 580 1
HD‐ICS/LABA 982 14
van Zyl‐Smit 2020
(high risk group)
MD‐ICS/LABA 437 1
HD‐ICS/LABA 887 5
Log‐Hazards Data
Study Treatment lnHR lnSE
Kerstjens 2020
(high risk group)
MD‐ICS/LABA 0.637 0.439
MD Triple
Kerstjens 2020
(high risk group)
HD‐ICS/LABA 0 0.503
HD Triple

* Study was excluded from the NMA, as it contributed no evidence to the network. † Both entries from Kerstjens 2020 are from a single study but are included in the NMA as independent studies because it was not possible to calculate a covariance matrix for the reported correlated the data. HD: high dose; ICS: inhaled corticosteroids; lnHR: log hazard ratio; lnSE: log standard error; LABA: long‐acting beta‐2 agonist; MD: medium dose.

Appendix 3. Model fit parameters

  Fixed‐Effect Model Random‐Effects Model
Severe exacerbations‐ group (18 DPs)
DIC 72.92 74.38
Total Residual Deviance, Mean 19.95 18.27
Between‐study SD,
Median (95% CrI) ‐‐ 0.30 (0.02, 0.94)
Severe exacerbations‐ high risk subgroup (6 DPs)
DIC 26.54 28.77
Total Residual Deviance, Mean† 5.26 4.03
Between‐study SD,
Median (95% CrI) ‐‐ 0.263 (0.011, 0.977)
Severe exacerbations‐ low risk subgroup (12 DPs)
DIC 39.86 46.19
Total Residual Deviance, Mean† 11.06 10.01
Between‐study SD,
Median (95% CrI) ‐‐ 0.314 (0.016, 1.05)
Severe exacerbations‐ individual treatment (36 DPs)
DIC 95.97 97.45
Total Residual Deviance, Mean 33.86 33.92
Between‐study SD,
Median (95% CrI) ‐‐ 0.13 (0.01, 0.77)
Moderate to severe exacerbations‐ group (24 DPs)
DIC 32.56 34.19
Total Residual Deviance, Mean 19.49 19.39
Between‐study SD,
Median (95% CrI) ‐‐ 0.063 (0.003, 0.243)
Moderate to severe exacerbations‐ high risk subgroup (12 DPs)
DIC 17.55 19.26
Total Residual Deviance, Mean† 9.55 10.13
Between‐study SD,
Median (95% CrI) ‐‐ 0.080 (0.003, 0.411)
Moderate to severe exacerbations‐ low risk subgroup (12 DPs)
DIC 18.33 19.24
Total Residual Deviance, Mean† 10.35 10.08
Between‐study SD,
Median (95% CrI) ‐‐ 0.18 (0.01, 0.67)
Moderate to severe exacerbations‐ individual treatment (36 DPs)
DIC 224.90 231.30
Total Residual Deviance, Mean 33.86 33.92
Between‐study SD,
Median (95% CrI) ‐‐ 0.13 (0.01, 0.77)
Change from baseline in ACQ scores at 3 months‐group (10 DPs)
DIC 15.23 16.62
Total Residual Deviance, Mean 8.24 8.59
Between‐study SD,
Median (95% CrI) ‐‐ 0.032 (0.001, 0.108)
Change from baseline in ACQ scores at 6 months‐group (16 DPs)
DIC 26.68 27.48
Total Residual Deviance, Mean 17.78 15.51
Between‐study SD,
Median (95% CrI) ‐‐ 0.040 (0.002, 0.128)
Change from baseline in ACQ scores at 12 months‐group (14 DPs)
DIC 24.90 24.11
Total Residual Deviance, Mean 16.91 13.36
Between‐study SD,
Median (95% CrI) ‐‐ 0.061 (0.006, 0.130)
Change from baseline in AQLQ scores at 6 months‐group (8 DPs)
DIC 15.69 15.64
Total Residual Deviance, Mean 8.69 8.07
Between‐study SD,
Median (95% CrI) ‐‐ 0.132 (0.006, 0.270)
Change from baseline in AQLQ scores at 12 months ‐ group (10 DPs)
DIC 17.85 18.32
Total Residual Deviance, Mean 10.86 9.71
Between‐study SD,
Median (95% CrI) ‐‐ 0.073 (0.004, 0.219)
ACQ responders at 6 months – group (18 DPs)
DIC 31.45 31.65
Total Residual Deviance, Mean 21.43 19.94
Between‐study SD,
Median (95% CrI) ‐‐ 0.038 (0.002, 0.190)
ACQ responders at 6 months ‐ individual treatment (11 DPs)
DIC 18.75 19.09
Total Residual Deviance, Mean 10.75 10.54
Between‐study SD,
Median (95% CrI) ‐‐ 0.035 (0.002, 0.258)
ACQ responders at 12 months ‐ group (12 DPs)
DIC 26.70 25.06
Total Residual Deviance, Mean 18.69 14.70
Between‐study SD,
Median (95% CrI) ‐‐ 0.092 (0.003, 0.371)
ACQ responders at 12 months ‐ individual treatment (8 DPs)
DIC 17.51 16.92
Total Residual Deviance, Mean 11.51 9.83
Between‐study SD,
Median (95% CrI) ‐‐ 0.071 (0.003, 0.513)
All‐cause SAEs ‐ group (30 DPs)
DIC 46.04 46.59
Total Residual Deviance, Mean 30.04 29.73
Between‐study SD,
Median (95% CrI) ‐‐ 0.033 (0.002, 0.228)
All‐cause SAEs ‐ individual treatment (28 DPs)
DIC 49.67 49.67
Total Residual Deviance, Mean 26.27 26.14
Between‐study SD,
Median (95% CrI) ‐‐ 0.038 (0.002, 0.300)
Asthma‐related SAEs ‐ group (26 DPs)
DIC 33.38 33.59
Total Residual Deviance, Mean 19.20 19.22
Between‐study SD,
Median (95% CrI) ‐‐ 0.034 (0.002, 0.252)
Asthma‐related SAEs‐ individual treatment (26 DPs)
DIC 123.60 123.80
Total Residual Deviance, Mean 22.80 22.86
Between‐study SD,
Median (95% CrI) ‐‐ 0.08 (0.004, 0.634)
All‐cause AEs ‐ group (28 DPs)
DIC 40.88 41.66
Total Residual Deviance, Mean 25.87 25.67
Between‐study SD,
Median (95% CrI) ‐‐ 0.024 (0.002, 0.123)
All‐cause AEs ‐ individual treatment (32 DPs)
DIC 57.73 58.34
Total Residual Deviance, Mean 29.65 28.54
Between‐study SD,
Median (95% CrI) ‐‐ 0.027 (0.002, 0.170)
Dropouts due to AEs ‐ group (28 DPs)
DIC 49.64 49.66
Total Residual Deviance, Mean 34.31 33.22
Between‐study SD,
Median (95% CrI) ‐‐ 0.058 (0.003, 0.603)
Dropouts due to AEs ‐ individual treatment (34 DPs)
DIC 170.10 170.50
Total Residual Deviance, Mean 33.79 33.82
Between‐study SD,
Median (95% CrI) ‐‐ 0.091 (0.005, 0.812)

ACQ: Asthma Control Questionnaire, AE: adverse event, AQLQ: Asthma Quality of Life Questionnaire, CrI: credible interval; DIC: deviance information criterion; DP: data point, SAE: serious adverse event, SD: standard deviation.

Appendix 4. Data table for studies included for severe exacerbations for individual treatments

Dichotomous Data
Study Treatment (dose in micrograms) N n of participants with the event
Bernstein 2015* FF/VI 100/25 qd 346 0
FF/VI 200/25 qd 346 0
Bodzenta‐Lukaszyk 2012 BUD/FM 320/12 bid 139 1
FP/FM 250/10 bid 140 0
Busse 2008 FP/SAL 250/50 bid 404 2
BUD/FM 320/12 bid 422 1
Lee 2020 FF/VI 100/25 qd 407 7
FF/VI 200/25 qd 406 5
FF/UMEC/VI 100/62.5/25 qd 406 7
FF/UMEC/VI 200/62.5/25 qd 408 4
Mansfield 2017 FP/SAL 250/50 bid 41 0
FP/SAL 200/12.5 bid 133 2
FP/SAL 500/50 bid 44 0
Peters 2008 BUD/FM 320/12 bid 132 2
BUD/FM 640/18 bid 443 2
Stempel 2016 FP/SAL 250/50 bid 580 1
FP/SAL 500/50 bid 982 14
van Zyl‐Smit 2020 MF/IND 160/150 qd 437 1
FP/SAL 500/50 bid 444 2
MF/IND 320/150 qd 443 3
Woodcock 2013 FP/SAL 250/50 bid 403 2
FF/VI 100/25 qd 403 1
Log‐Hazards Data
Study Treatment lnHR lnSE
Kerstjens 2020 MF/IND 160/150 qd 0.637 0.439
MF/GLY/IND 80/50/150 qd
Kerstjens 2020 FP/SAL 500/50 bid 0 0.503
MF/GLY/IND 160/50/150 qd

* Study was excluded from the NMA, as it contributed no evidence to the network. † Both entries from Kerstjens 2020 are from a single study but are included in the NMA as independent studies because it was not possible to calculate a covariance matrix for the reported correlated the data. bid= twice daily, BUD=budesonide, FF=fluticasone furoate, FM=formoterol, FP=fluticasone propionate, GLY= glycopyrronium, IND=indacaterol, lnHR= log hazard ratio, lnSE= log standard error, MF=mometasone furoate, qd= once daily, SAL=salmeterol, Tio=tiotropium, UMEC= umeclidinium, VI=vilanterol.

Appendix 5. Data table for studies included for moderate to severe exacerbations

Dichotomous Data
Study Treatment N n of participants with the event
Bernstein 2015
(low risk group)
MD‐ICS/LABA 346 3
HD‐ICS/LABA 346 4
Gessner 2020
(high risk group)
MD Triple 474 4
HD Triple 951 4
Kerstjens 2012
(high risk group)
HD‐ICS/LABA 454 149
HD Triple 454 122
Kerstjens 2020
(high risk group)
MD‐ICS/LABA 607 166
HD‐ICS/LABA 1223 324
MD Triple 616 151
HD Triple 615 134
Lee 2020
(low risk group)
MD‐ICS/LABA 407 77
HD‐ICS/LABA 406 57
MD Triple 406 72
HD Triple 408 57
Mansfield 2017
(low risk group)
MD‐ICS/LABA 174 8
HD‐ICS/LABA 44 2
Peters 2008
(low risk group)
MD‐ICS/LABA 132 19
HD‐ICS/LABA 443 54
van Zyl‐Smit 2020 MD‐ICS/LABA 437 43
HD‐ICS/LABA 887 89
Virchow 2019a
(high risk group)
MD‐ICS/LABA 575 119
MD Triple 573 90
Virchow 2019b
(high risk group)
HD‐ICS/LABA 570 138
HD Triple 859 166

HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

Appendix 6. Data table for studies included for moderate to severe exacerbations for individual treatments

Dichotomous Data
Study Treatment (dose in micrograms) N n of participants with the event
Bernstein 2011 FP/SAL 250/50 bid 351 20
MF/FM 200/10 bid 371 21
Bernstein 2015 FF/VI 100/25 qd 346 3
FF/VI 200/25 qd 346 4
Bodzenta‐Lukaszyk 2012 BUD/FM 320/12 bid 139 2
FP/FM 250/10 bid 140 1
Busse 2008 FP/SAL 250/50 bid 404 50
BUD/FM 320/12 bid 422 49
Cukier 2013 BUD/FM 320/12 bid 99 6
FP/FM 250/10 bid 97 6
Gessner 2020 MF/GLY/IND 80/50/150 qd 474 4
MF/GLY/IND 160/50/150 qd 476 2
FP/SAL 500/50 bid + Tio 5 qd 475 2
Kerstjens 2020 MF/IND 160/150 qd 607 166
FP/SAL 500/50 bid 612 182
MF/IND 320/150 qd 611 142
MF/GLY/IND 80/50/150 qd 616 151
MF/GLY/IND 160/50/150 qd 615 134
Lee 2020 FF/VI 100/25 qd 407 77
FF/VI 200/25 qd 406 57
FF/UMEC/VI 100/62.5/25 qd 406 72
FF/UMEC/VI 200/62.5/25 qd 408 57
Mansfield 2017 FP/SAL 250/50 bid 41 0
FP/SAL 200/12.5 bid 133 8
FP/SAL 500/50 bid 44 2
Papi 2007 FP/SAL 250/50 bid 113 6
BDP/FM 200/12 bid 115 2
Peters 2008 BUD/FM 320/12 bid 132 19
BUD/FM 640/18 bid 443 54
van Zyl‐Smit 2020 MF/IND 160/150 qd 437 43
FP/SAL 500/50 bid 444 53
MF/IND 320/150 qd 443 36
Virchow 2019a BDP/FM 200/12 bid 575 119
BDP/FM/G 200/12/20 bid 573 90
Woodcock 2013 FP/SAL 250/50 bid 403 12
FF/VI 100/25 qd 403 10

bid= twice daily, BUD=budesonide, FF=fluticasone furoate, FM=formoterol, FP=fluticasone propionate, GLY= glycopyrronium, IND=indacaterol, MF=mometasone furoate, qd= once daily, SAL=salmeterol, Tio=tiotropium, UMEC= umeclidinium, VI=vilanterol.

Appendix 7. Data table for studies included for the change from baseline in ACQ scores at 3 months

Study Treatment N Mean CFB SD
Gessner 2020 MD Triple 436 ‐1.043 0.940
HD Triple 869 ‐1.060 0.938
Lee 2020 MD‐ICS/LABA 379 ‐0.579 0.701
HD‐ICS/LABA 382 ‐0.607 0.723
MD Triple 389 ‐0.643 0.71
HD Triple 385 ‐0.699 0.667
van Zyl‐Smit 2020 MD‐ICS/LABA 414 ‐0.923 0.834
HD‐ICS/LABA 848 ‐0.880 0.844
Weinstein 2010 MD‐ICS/LABA 205 ‐0.590 0.630
HD‐ICS/LABA 222 ‐0.580 0.626

ACQ: Asthma Control Questionnaire; CFB: change from baseline; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose; SD: standard deviation.

Appendix 8. Data table for studies included for change from baseline in ACQ scores at 6 months

Study Treatment N Mean CFB SD
Gessner 2020 MD Triple 437 ‐1.080 0.962
HD Triple 888 ‐1.111 0.960
Kerstjens 2012a HD‐ICS/LABA 222 ‐0.580 1.058
HD Triple 237 ‐0.705 1.047
Kerstjens 2012b HD‐ICS/LABA 232 ‐0.390 1.036
HD Triple 216 ‐0.589 1.029
Kerstjens 2020 MD‐ICS/LABA 598 ‐0.886 0.954
HD‐ICS/LABA 1195 ‐0.972 0.968
MD Triple 595 ‐0.957 0.976
HD Triple 607 ‐0.958 1.010
Lee 2020 MD‐ICS/LABA 371 ‐0.637 0.732
HD‐ICS/LABA 374 ‐0.720 0.696
MD Triple 385 ‐0.749 0.746
HD Triple 376 ‐0.775 0.640
van Zyl‐Smit 2020 MD‐ICS/LABA 407 ‐1.035 0.706
HD‐ICS/LABA 817 ‐1.003 0.715

ACQ: Asthma Control Questionnaire; CFB: change from baseline; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; LD: low dose; MD: medium dose; SD: standard deviation.

Appendix 9. Data table for studies included for change from baseline in ACQ scores at 12 months

Study Treatment N Mean CFB SD
Kerstjens 2012a HD‐ICS/LABA 222 ‐0.593 1.073
HD Triple 237 ‐0.714 1.062
Kerstjens 2012b HD‐ICS/LABA 232 ‐0.441 1.036
HD Triple 216 ‐0.573 1.043
Kerstjens 2020 MD‐ICS/LABA 598 ‐0.955 0.978
HD‐ICS/LABA 1195 ‐1.054 0.981
MD Triple 595 ‐0.965 0.976
HD Triple 607 ‐1.094 1.010
Lee 2020 MD‐ICS/LABA 84 ‐0.781 0.660
HD‐ICS/LABA 88 ‐0.687 0.653
MD Triple 89 ‐0.809 0.782
HD Triple 90 ‐0.771 0.617
van Zyl‐Smit 2020 MD‐ICS/LABA 397 ‐1.114 0.709
HD‐ICS/LABA 790 ‐1.066 0.707

ACQ: Asthma Control Questionnaire; CFB: change from baseline; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose; SD: standard deviation.

Appendix 10. Data table for studies included for change from baseline in AQLQ scores at 6 months

Study Treatment N Mean CFB SD
Gessner 2020 MD Triple 474 0.710 1.524
HD Triple 952 0.790 1.505
Kerstjens 2012a HD‐ICS/LABA 222 0.484 1.415
HD Triple 237 0.525 1.401
Kerstjens 2012b HD‐ICS/LABA 232 0.169 1.325
HD Triple 216 0.447 1.337
van Zyl‐Smit 2020 MD‐ICS/LABA 407 0.767 0.660
HD‐ICS/LABA 816 0.712 0.749

AQLQ: Asthma Quality of Life Questionnaire; CFB: change from baseline; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose; SD: standard deviation.

Appendix 11. Data table for studies included for change from baseline in AQLQ scores at 12 months

Study Treatment N Mean CFB SD
Kerstjens 2012a HD‐ICS/LABA 222 0.509 1.415
HD Triple 237 0.547 1.416
Kerstjens 2012b HD‐ICS/LABA 232 0.245 1.356
HD Triple 216 0.485 1.352
Kerstjens 2020 MD‐ICS/LABA 536 0.810 0.833
HD‐ICS/LABA 1093 0.830 0.841
MD Triple 535 0.760 0.833
HD Triple 552 0.870 0.822
van Zyl‐Smit 2020 MD‐ICS/LABA 397 0.861 0.773
HD‐ICS/LABA 789 0.792 0.769

AQLQ: Asthma Quality of Life Questionnaire; CFB: change from baseline; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose; SD: standard deviation.

Appendix 12. Data table for studies included for ACQ responders at 6 months

Study Treatment N Responders
Gessner 2020 MD Triple 447 393
HD Triple 901 762
Kerstjens 2012 HD‐ICS/LABA 454 213
HD Triple 453 244
Kerstjens 2020 MD‐ICS/LABA 559 395
HD‐ICS/LABA 1124 796
MD Triple 559 401
HD Triple 566 403
Lee 2020 MD‐ICS/LABA 396 205
HD‐ICS/LABA 397 231
MD Triple 400 247
HD Triple 395 251
van Zyl‐Smit 2020 MD‐ICS/LABA 407 310
HD‐ICS/LABA 817 622
Virchow 2019a MD‐ICS/LABA 574 291
MD Triple 575 317
Virchow 2019b HD‐ICS/LABA 571 319
HD Triple 858 530

ACQ: Asthma Control Questionnaire; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose; SD: standard deviation.

Appendix 13. Data table for studies included for ACQ responders at 6 months for individual interventions

Study Treatment (dose in micrograms) N Responders
Gessner 2020 MF/GLY/IND 80/50/150 qd 447 393
MF/GLY/IND 160/50/150 qd 454 387
SAL/FP 50/500 bid +Tio 5 qd 447 375
Kerstjens 2020 MF/IND 160/150 qd 559 395
FP/SAL 500/50 bid 562 379
MF/IND 320/150 qd 562 417
MF/GLY/IND 80/50/150 qd 559 401
MF/GLY/IND 160/50/150 qd 566 403
van Zyl‐Smit 2020 MF/IND 160/150 qd 407 310
FP/SAL 500/50 bid 410 311
MF/IND 320/150 qd 407 311
Kerstjens 2012* HD‐ICS/LABA 454 213
HD‐ICS/LABA+Tio5 453 244
Lee 2020* FF/VI 100/25 qd 396 205
FF/VI 200/25 qd 397 231
FF/UMEC/VI 100/62.5/25 qd 400 247
FF/UMEC/VI 200/62.5/25 qd 395 251
Virchow 2019a* BDP/FM 200/12 bid 574 291
BDP/FM/GLY 200/12/20 bid 575 317

* These studies were disconnected from the main network and not included in the analysis for this outcome. ACQ= Asthma Control Questionnaire, BDP= beclomethasone dipropionate, bid= twice daily, BUD=budesonide, FF=fluticasone furoate, FM=formoterol, FP=fluticasone propionate, GLY= glycopyrronium, HDICSLABA= high‐dose inhaled corticosteroids/long‐acting beta2 agonist, IND=indacaterol, MF=mometasone furoate, qd= once daily, SAL=salmeterol, Tio=tiotropium, UMEC= umeclidinium, VI=vilanterol.

Appendix 14. Data table for studies included for ACQ responders at 12 months for grouped interventions

Study Treatment N Responders
Kerstjens 2012 HD‐ICS/LABA 454 205
HD Triple 453 263
Kerstjens 2020 MD‐ICS/LABA 536 392
HD‐ICS/LABA 1094 824
MD Triple 537 391
HD Triple 552 435
van Zyl‐Smit 2020 MD‐ICS/LABA 397 326
HD‐ICS/LABA 790 612
Virchow 2019a MD‐ICS/LABA 574 340
MD Triple 575 350
Virchow 2019b HD‐ICS/LABA 571 332
HD Triple 858 524

ACQ: Asthma Control Questionnaire; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

Appendix 15. Data table for studies included for ACQ responders at 12 months for individual interventions

Study Treatment (dose in micrograms) N Responders
Kerstjens 2020 MF/IND 160/150 qd 536 392
FP/SAL 500/50 bid 547 398
MF/IND 320/150 qd 547 426
MF/GLY/IND 80/50/150 qd 537 391
MF/GLY/IND 160/50/150 qd 552 435
van Zyl‐Smit 2020 MF/IND 160/150 qd 397 326
FP/SAL 500/50 bid 405 313
MF/IND 320/150 qd 385 299
Kerstjens 2012* HD‐ICS/LABA 454 205
HDICSLABA+Tio5 453 263
Virchow 2019* BDP/FM 200/12 bid 574 340
BDP/FM 400/12 bid 571 332
BDP/FM /GLY 200/12/20 bid 575 350
BDP/FM 400/12 bid +Tio 5 qd 287 168
BDP/FM /GLY 400/12/20 bid 571 356

* These studies were disconnected from the main network and not included in the analysis for this outcome. ACQ= Asthma Control Questionnaire, BDP= beclomethasone dipropionate, bid= twice daily, BUD=budesonide, FF=fluticasone furoate, FM=formoterol, FP=fluticasone propionate, GLY= glycopyrronium, HD‐ICS/LABA= high‐dose inhaled corticosteroids/long‐acting beta2 agonist, IND=indacaterol, MF=mometasone furoate, qd=once daily, SAL=salmeterol, Tio=tiotropium, UMEC= umeclidinium, VI=vilanterol.

Appendix 16. Data table for studies included for all‐cause SAEs for grouped interventions

Study Treatment N n of participants with the event
Bernstein 2015 MD‐ICS/LABA 346 4
HD‐ICS/LABA 346 1
Gessner 2020 MD Triple 474 14
HD Triple 951 37
Kerstjens 2012a HD‐ICS/LABA 222 15
HD Triple 237 18
Kerstjens 2012b HD‐ICS/LABA 234 25
HD Triple 219 19
Kerstjens 2020 MD‐ICS/LABA 608 38
HD‐ICS/LABA 1231 91
MD Triple 617 49
HD Triple 616 46
Lee 2020 MD‐ICS/LABA 407 25
HD‐ICS/LABA 406 21
MD Triple 406 23
HD Triple 408 21
Mansfield 2017 MD‐ICS/LABA 174 15
HD‐ICS/LABA 44 3
Peters 2008 MD‐ICS/LABA 132 12
HD‐ICS/LABA 443 21
Stempel 2016 MD‐ICS/LABA 580 10
HD‐ICS/LABA 982 34
van Zyl‐Smit 2020 MD‐ICS/LABA 437 20
HD‐ICS/LABA 887 42
Virchow 2019a MD‐ICS/LABA 574 22
MD Triple 576 28
Virchow 2019b HD‐ICS/LABA 573 33
HD Triple 858 43
Weinstein 2010 MD‐ICS/LABA 233 3
HD‐ICS/LABA 255 2

HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose; SAE: serious adverse event.

Appendix 17. Data table for studies included for all‐cause SAEs for individual interventions

Study Treatment (dose in micrograms) N n of participants with the event
Bernstein 2011 FP/SAL 250/50 bid 351 8
MF/FM 200/10 bid 371 6
Bernstein 2015 FF/VI 100/25 qd 346 4
FF/VI 200/25 qd 346 1
Gessner 2020 MF/GLY/IND 80/50/150 qd 474 14
MF/GLY/IND 160/50/150 qd 476 18
SAL/FP 50/500 μg bid HD +Tio 5 qd 475 19
Kerstjens 2020 MF/IND 160/150 qd 608 38
FP/SAL 500/50 bid 618 39
MF/IND 320/150 qd 613 52
MF/GLY/IND 80/50/150 qd 617 49
MF/GLY/IND 160/50/150 qd 616 46
Lee 2020 FF/VI 100/25 qd 407 25
FF/VI 200/25 qd 406 21
FF/UMEC/VI 100/62.5/25 qd 406 23
FF/UMEC/VI 200/62.5/25 qd 408 21
Mansfield 2017 FP/SAL 250/50 bid 41 2
FP/SAL 200/12.5 bid 133 13
FP/SAL 500/50 bid 44 3
Stempel 2016 FP/SAL 250/50 bid 580 10
FP/SAL 500/50 bid 982 34
van Zyl‐Smit 2020 MF/IND 160/150 qd 437 20
FP/SAL 500/50 bid 444 21
MF/IND 320/150 qd 443 21
Weinstein 2010 MF/FM 200/10 bid 233 3
MF/FM 400/10 bid 255 2
Woodcock 2013 FP/SAL 250/50 bid 403 5
FF/VI 100/25 qd 403 4
Bodzenta‐Lukaszyk 2012* BUD/FM 400/12 bid 139 2
FP/FM 250/10 bid 140 1
Cukier 2013* BUD/FM 400/12 bid 99 3
FP/FM 250/12 bid 97 2
Kerstjens 2012a* HD‐ICS/LABA 222 15
HD‐ICS/LABA+Tio5 237 18
Kerstjens 2012a* HD‐ICS/LABA 234 25
HD‐ICS/LABA+Tio5 219 19
Peters 2008* BUD/FM 320/9 bid 132 12
BUD/FM 640/18 bid 443 21
Virchow 2019a* BDP/FM/GLY 200/12/20 bid 576 28
BDP/FM 200/12 bid 574 22
Virchow 2019b* BDP/FM/GLY 400/12/20 bid 571 28
BDP/FM 400/12 bid 573 33
BDP/FM 400/12 bid +Tio 5 qd 287 15

* These studies were disconnected from the main network and not included in the analysis for this outcome. BDP= beclomethasone dipropionate, bid= twice daily, BUD=budesonide, FF=fluticasone furoate, FM=formoterol, FP=fluticasone propionate, GLY= glycopyrronium, IND=indacaterol, MF=mometasone furoate, qd=once daily, SAE= serious adverse event, SAL=salmeterol, Tio=tiotropium, UMEC= umeclidinium, VI=vilanterol.

Appendix 18. Data table for studies included for asthma‐related SAEs for grouped interventions

Study Treatment N n of participants with the event
Gessner 2020 MD Triple 474 4
HD Triple 951 4
Kerstjens 2012a HD‐ICS/LABA 222 10
HD Triple 237 9
Kerstjens 2012b HD‐ICS/LABA 234 11
HD Triple 219 8
Kerstjens 2020 MD‐ICS/LABA 608 8
HD‐ICS/LABA 1231 21
MD Triple 617 15
HD Triple 616 9
Lee 2020 MD‐ICS/LABA 407 7
HD‐ICS/LABA 406 6
MD Triple 406 7
HD Triple 408 4
Mansfield 2017 MD‐ICS/LABA 174 9
HD‐ICS/LABA 44 2
Stempel 2016 MD‐ICS/LABA 580 2
HD‐ICS/LABA 982 11
van Zyl‐Smit 2020 MD‐ICS/LABA 437 2
HD‐ICS/LABA 887 5
Virchow 2019a MD‐ICS/LABA 574 4
MD Triple 576 7
Virchow 2019b HD‐ICS/LABA 573 11
HD Triple 858 17
Weinstein 2010 MD‐ICS/LABA 233 0
HD‐ICS/LABA 255 1

HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose; SAE: serious adverse event.

Appendix 19. Data table for studies included for asthma‐related SAEs for individual interventions

Study Treatment (dose in micrograms) N n of participants with the event
Bernstein 2011 FP/SAL 250/50 bid 351 1
MF/FM 200/10 bid 371 1
Gessner 2020 MF/GLY/IND 80/50/150 qd 474 4
MF/GLY/IND 160/50/150 qd 476 3
SAL/FP 50/500 μg bid HD +Tio 5 qd 475 2
Kerstjens 2020 MF/IND 160/150 qd 608 8
FP/SAL 500/50 bid 618 9
MF/IND 320/150 qd 613 12
MF/GLY/IND 80/50/150 qd 617 15
MF/GLY/IND 160/50/150 qd 616 9
Lee 2020 FF/VI 100/25 qd 407 7
FF/VI 200/25 qd 406 6
FF/UMEC/VI 100/62.5/25 qd 406 7
FF/UMEC/VI 200/62.5/25 qd 408 4
Mansfield 2017 FP/SAL 250/50 bid 41 1
FP/SAL 200/12.5 bid 133 8
FP/SAL 500/50 bid 44 2
Stempel 2016 FP/SAL 250/50 bid 580 2
FP/SAL 500/50 bid 982 11
van Zyl‐Smit 2020 MF/IND 160/150 qd 437 2
FP/SAL 500/50 bid 444 2
MF/IND 320/150 qd 443 3
Weinstein 2010 MF/FM 200/10 bid 234 0
MF/FM 400/10 bid 256 1
Woodcock 2013 FP/SAL 250/50 bid 403 2
FF/VI 100/25 qd 403 1
Kerstjens 2012a* HD‐ICS/LABA 222 10
HD‐ICS/LABA +Tio5 237 9
Kerstjens 2012b* HD‐ICS/LABA 234 11
HD‐ICS/LABA +Tio5 219 8
Virchow 2019a* BDP/FM/GLY 200/12/20 bid 576 7
BDP/FM 200/12 bid 574 4
Virchow 2019b* BDP/FM /GLY 400/12/20 bid 571 11
BDP/FM 400/12 bid 573 11
BDP/FM 400/12 bid + Tio 5 qd 287 6

* These studies were disconnected from the main network and not included in the analysis for this outcome. BDP: beclomethasone dipropionate, bid: twice daily, BUD: budesonide, FF: fluticasone furoate, FM: formoterol, FP: fluticasone propionate, GLY: glycopyrronium, IND: indacaterol, MF: mometasone furoate, qd: once daily, SAE: serious adverse event; SAL: salmeterol, Tio: tiotropium, UMEC: umeclidinium, VI: vilanterol.

Appendix 20. Data table for studies included for all‐cause AEs for grouped interventions

Study Treatment N n of participants with the event
Bernstein 2015 MD‐ICS/LABA 346 54
HD‐ICS/LABA 346 52
Gessner 2020 MD Triple 474 252
HD Triple 952 494
Kerstjens 2012a HD‐ICS/LABA 222 148
HD Triple 237 136
Kerstjens 2012b HD‐ICS/LABA 234 171
HD Triple 219 134
Kerstjens 2020 MD‐ICS/LABA 608 392
HD‐ICS/LABA 1231 796
MD Triple 617 387
HD Triple 616 367
Lee 2020 MD‐ICS/LABA 407 136
HD‐ICS/LABA 406 122
MD Triple 406 135
HD Triple 408 122
Mansfield 2017 MD‐ICS/LABA 174 90
HD‐ICS/LABA 44 23
Peters 2008 MD‐ICS/LABA 132 111
HD‐ICS/LABA 443 394
van Zyl‐Smit 2020 MD‐ICS/LABA 437 233
HD‐ICS/LABA 887 467
Virchow 2019a MD‐ICS/LABA 574 455
MD Triple 576 431
Virchow 2019b HD‐ICS/LABA 573 443
HD Triple 858 620
Weinstein 2010 MD‐ICS/LABA 233 8
HD‐ICS/LABA 255 12

AE: adverse event; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

Appendix 21. Data table for studies included for all‐cause AEs for individual interventions

Study Treatment (dose in micrograms) N n of participants with the event
Bernstein 2011 FP/SAL 250/50 bid 351 77
MF/FM 200/10 bid 371 85
Bernstein 2015 FF/VI 100/25 qd 346 54
FF/VI 200/25 qd 346 52
Bodzenta‐Lukaszyk 2012 BUD/FM 320/9 bid 139 26
FP/FM 250/12 bid 140 29
Busse 2018 FP/SAL 250/50 bid 391 17
BUD/FM 320/9 bid 389 31
Gessner 2020 MF/GLY/IND 80/50/150 qd 474 252
MF/GLY/IND 160/50/150 qd 476 249
SAL/FP 50/500 μg bid HD +Tio 5 qd 476 245
Kerstjens 2020 MF/IND 160/150 qd 608 392
FP/SAL 500/50 bid 618 419
MF/IND 320/150 qd 613 377
MF/GLY/IND 80/50/150 qd 617 387
MF/GLY/IND 160/50/150 qd 616 367
Lee 2020 FF/VI 100/25 qd 407 136
FF/VI 200/25 qd 406 122
FF/UMEC/VI 100/62.5/25 qd 406 135
FF/UMEC/VI 200/62.5/25 qd 408 122
Mansfield 2017 FP/SAL 250/50 bid 41 22
FP/SAL 200/12.5 bid 133 68
FP/SAL 500/50 bid 44 23
Peters 2008 BUD/FM 320/9 bid 132 111
BUD/FM 640/18 bid 443 394
van Zyl‐Smit 2020 MF/IND 160/150 qd 437 233
FP/SAL 500/50 bid 444 239
MF/IND 320/150 qd 443 228
Weinstein 2010 MF/FM 200/10 bid 233 8
MF/FM 400/10 bid 255 12
Woodcock 2013 FP/SAL 250/50 bid 403 106
FF/VI 100/25 qd 403 110
Kerstjens 2012a* HD‐ICS/LABA 222 148
HD‐ICS/LABA + Tio 5 237 136
Kerstjens 2012b* HD‐ICS/LABA 234 171
HD‐ICS/LABA + Tio 5 219 134
Virchow 2019a* BDP/FM/GLY 200/12/20 bid 576 431
BDP/ FM 200/12 bid 574 455
Virchow 2019b* BDP/FM/GLY 400/12/20 bid 571 410
BDP/ FM 400/12 bid 573 443
BDP/ FM 400/12 bid +Tio 5 qd 287 210

* These studies were disconnected from the main network and not included in the analysis for this outcome. AE: adverse event, bid: twice daily, BUD: budesonide, FF: fluticasone furoate, FM: formoterol, FP: fluticasone propionate, GLY: glycopyrronium, IND: indacaterol, MF: mometasone furoate, qd: once daily, SAL: salmeterol, Tio: tiotropium, UMEC: umeclidinium, VI: vilanterol.

Appendix 22. Data table for studies for dropouts due to AEs for grouped interventions

Study Treatment N n of participants with the event
Bernstein 2015 MD‐ICS/LABA 346 3
HD‐ICS/LABA 346 3
Gessner 2020 MD Triple 474 5
HD Triple 951 6
Kerstjens 2012a HD‐ICS/LABA 222 6
HD Triple 237 6
Kerstjens 2012b HD‐ICS/LABA 234 8
HD Triple 219 2
Kerstjens 2020 MD‐ICS/LABA 617 19
HD‐ICS/LABA 1236 38
MD Triple 620 24
HD Triple 619 12
Lee 2020 MD‐ICS/LABA 407 9
HD‐ICS/LABA 406 2
MD Triple 406 2
HD Triple 408 2
Mansfield 2017 MD‐ICS/LABA 174 2
HD‐ICS/LABA 44 1
Peters 2008 MD‐ICS/LABA 132 8
HD‐ICS/LABA 443 35
van Zyl‐Smit 2020 MD‐ICS/LABA 439 0
HD‐ICS/LABA 891 2
Virchow 2019a MD‐ICS/LABA 576 5
MD Triple 579 0
Virchow 2019b HD‐ICS/LABA 576 7
HD Triple 861 5
Weinstein 2010 MD‐ICS/LABA 233 2
HD‐ICS/LABA 255 2

AE: adverse event; HD: high dose; ICS: inhaled corticosteroids; LABA: long‐acting beta‐2 agonist; MD: medium dose.

Appendix 23. Data table for studies included for dropouts due to AEs for individual interventions

Study Treatment (dose in micrograms) N n of participants with the event
Bernstein 2011 FP/SAL 250/50 bid 351 6
MF/FM 200/10 bid 371 8
Bernstein 2015 BUD/FM 320/9 bid 346 3
FF/VI 200/25 qd 346 3
Bodzenta‐Lukaszyk 2012 BUD/FM 320/9 bid 139 3
FP/FM 250/12 bid 140 1
Busse 2008 FP/SAL 250/50 bid 391 5
BUD/FM 320/9 bid 389 5
Cukier 2013 BUD/FM 320/9 bid 99 1
FP/FM 250/ 12 bid 97 1
Gessner 2020 MF/GLY/IND 80/50/150 qd 474 5
MF/GLY/IND 160/50/150 qd 476 3
SAL/FP 50/500 bid +Tio 5 qd 475 3
Kerstjens 2020 MF/IND 160/150 qd 617 19
FP/SAL 500/50 bid 618 21
MF/IND 320/150 qd 618 17
MF/GLY/IND 80/50/150 qd 620 24
MF/GLY/IND 160/50/150 qd 619 12
Lee 2020 FF/VI 100/25 qd 407 9
FF/VI 200/25 qd 406 2
FF/UMEC/VI 100/62.5/25 qd 406 2
FF/UMEC/VI 200/62.5/25 qd 408 2
Mansfield 2017 FP/SAL 250/50 bid 41 2
FP/SAL 200/12.5 bid 133 0
FP/SAL 500/50 bid 44 1
Peters 2008 BUD/FM 320/9 bid 132 8
BUD/FM 640/18 bid 443 35
van Zyl‐Smit 2020 MF/IND 160/150 qd 439 0
FP/SAL 500/50 bid 446 2
MF/IND 320/150 qd 445 0
Weinstein 2010 MF/FM 200/10 bid 233 2
MF/FM 400/10 bid 255 2
Woodcock 2013 FP/SAL 250/50 bid 403 8
FF/VI 100/25 qd 403 6
Kerstjens 2012a* HD‐ICS/LABA 222 6
HD‐ICS/LABA +Tio 5 qd 237 6
Kerstjens 2012a* HD‐ICS/LABA 234 8
HD‐ICS/LABA +Tio 5 qd 219 2
Virchow 2019a* BDP/FM/GLY 200/12/20 bid 579 0
BDP/FM 200/12 bid 576 5
Virchow 2019b* BDP/FM/GLY 400/12/20 bid 573 3
BDP/FM 400/12 bid 576 7
BDP/FM 400/12 bid +Tio 5 qd 288 2

* These studies were disconnected from the main network and not included in the analysis for this outcome. AE: adverse event, BDP: beclomethasone dipropionate, bid: twice daily, BUD: budesonide, FF: fluticasone furoate, FM: formoterol, FP: fluticasone propionate, GLY: glycopyrronium, IND: indacaterol, MF: mometasone furoate, qd: once daily, SAL: salmeterol, Tio: tiotropium, UMEC: umeclidinium, VI: vilanterol.

Data and analyses

Comparison 1. Asthma exacerbations.

Outcome or subgroup title No. of studies No. of participants Statistical method Effect size
1.1 Severe exacerbations 6   Risk Ratio (M‐H, Fixed, 95% CI) Subtotals only
1.1.1 HD‐ICA/LABA vs MD‐ICS LABA 5 4492 Risk Ratio (M‐H, Fixed, 95% CI) 1.49 [0.74, 3.01]
1.1.2 MD TRIPLE vs MD‐ICS/LABA 1 813 Risk Ratio (M‐H, Fixed, 95% CI) 1.00 [0.35, 2.83]
1.1.3 HD TRIPLE vs MD‐ICS/LABA 1 815 Risk Ratio (M‐H, Fixed, 95% CI) 0.57 [0.17, 1.93]
1.1.4 MD TRIPLE vs HD‐ICS/LABA 1 812 Risk Ratio (M‐H, Fixed, 95% CI) 1.40 [0.45, 4.37]
1.1.5 HD TRIPLE vs HD‐ICS/LABA 2 1727 Risk Ratio (M‐H, Fixed, 95% CI) 0.80 [0.45, 1.42]
1.1.6 HD TRIPLE vs MD TRIPLE 1 814 Risk Ratio (M‐H, Fixed, 95% CI) 0.57 [0.17, 1.93]
1.1.7 TRIPLE vs DUAL 2 2540 Risk Ratio (M‐H, Fixed, 95% CI) 0.84 [0.51, 1.40]
1.2 Moderate to severe exacerbations 10   Risk Ratio (M‐H, Random, 95% CI) Subtotals only
1.2.1 HD‐ICS/LABA vs MD‐ICS/LABA 6 5452 Risk Ratio (M‐H, Random, 95% CI) 0.93 [0.82, 1.05]
1.2.2 MD TRIPLE vs MD‐ICS/LABA 3 3184 Risk Ratio (M‐H, Random, 95% CI) 0.86 [0.75, 0.99]
1.2.3 HD TRIPLE vs MD‐ICS/LABA 2 2037 Risk Ratio (M‐H, Random, 95% CI) 0.78 [0.66, 0.92]
1.2.4 MD TRIPLE vs HD‐ICS/LABA 2 2651 Risk Ratio (M‐H, Random, 95% CI) 1.05 [0.78, 1.41]
1.2.5 HD TRIPLE vs HD‐ICS/LABA 4 4989 Risk Ratio (M‐H, Random, 95% CI) 0.83 [0.75, 0.92]
1.2.6 HD TRIPLE vs MD TRIPLE 3 3470 Risk Ratio (M‐H, Random, 95% CI) 0.85 [0.72, 1.01]
1.2.7 TRIPLE vs DUAL 5 8173 Risk Ratio (M‐H, Random, 95% CI) 0.85 [0.78, 0.92]

Comparison 2. Asthma Control Questionnaire: change from baseline.

Outcome or subgroup title No. of studies No. of participants Statistical method Effect size
2.1 CFB in ACQ at 3 months 4   Mean Difference (IV, Random, 95% CI) Subtotals only
2.1.1 HD‐ICS/LABA vs MD‐ICS/LABA 3 2450 Mean Difference (IV, Random, 95% CI) 0.01 [‐0.05, 0.07]
2.1.2 MD TRIPLE vs MD‐ICS/LABA 1 768 Mean Difference (IV, Random, 95% CI) ‐0.06 [‐0.16, 0.04]
2.1.3 HD TRIPLE vs MD‐ICS/LABA 1 764 Mean Difference (IV, Random, 95% CI) ‐0.12 [‐0.22, ‐0.02]
2.1.4 MD TRIPLE vs HD‐ICS/LABA 1 771 Mean Difference (IV, Random, 95% CI) ‐0.04 [‐0.14, 0.06]
2.1.5 HD TRIPLE vs HD‐ICS/LABA 1 767 Mean Difference (IV, Random, 95% CI) ‐0.09 [‐0.19, 0.01]
2.1.6 HD TRIPLE vs MD TRIPLE 2 2079 Mean Difference (IV, Random, 95% CI) ‐0.04 [‐0.11, 0.03]
2.1.7 TRIPLE vs DUAL 1 1535 Mean Difference (IV, Random, 95% CI) ‐0.08 [‐0.15, ‐0.01]
2.2 CFB in ACQ at 6 months 7   Mean Difference (IV, Random, 95% CI) Subtotals only
2.2.1 HD‐ICS/LABA vs MD‐ICS/LABA 3 3762 Mean Difference (IV, Random, 95% CI) ‐0.04 [‐0.12, 0.04]
2.2.2 MD TRIPLE vs MD‐ICS/LABA 2 1961 Mean Difference (IV, Random, 95% CI) ‐0.09 [‐0.17, ‐0.02]
2.2.3 HD TRIPLE vs MD‐ICS/LABA 2 1952 Mean Difference (IV, Random, 95% CI) ‐0.11 [‐0.18, ‐0.04]
2.2.4 MD TRIPLE vs HD‐ICS/LABA 2 2561 Mean Difference (IV, Random, 95% CI) ‐0.01 [‐0.08, 0.06]
2.2.5 HD TRIPLE vs HD‐ICS/LABA 3 3459 Mean Difference (IV, Random, 95% CI) ‐0.06 [‐0.15, 0.03]
2.2.6 MD TRIPLE vs LD TRIPLE 2 2091 Mean Difference (IV, Random, 95% CI) ‐0.04 [‐0.13, 0.05]
2.2.7 HD TRIPLE vs LD TRIPLE 1 873 Mean Difference (IV, Random, 95% CI) 0.03 [‐0.10, 0.16]
2.2.8 HD TRIPLE vs MD TRIPLE 3 3288 Mean Difference (IV, Random, 95% CI) ‐0.02 [‐0.08, 0.04]
2.2.9 TRIPLE vs DUAL 4 5408 Mean Difference (IV, Random, 95% CI) ‐0.07 [‐0.14, ‐0.01]
2.3 CFB in ACQ at 12 months 6   Mean Difference (IV, Random, 95% CI) Subtotals only
2.3.1 HD‐ICS/LABA vs MD‐ICS/LABA 3 3152 Mean Difference (IV, Random, 95% CI) 0.00 [‐0.12, 0.12]
2.3.2 MD TRIPLE vs MD‐ICS/LABA 2 1366 Mean Difference (IV, Random, 95% CI) ‐0.01 [‐0.11, 0.08]
2.3.3 HD TRIPLE vs MD‐ICS/LABA 2 1379 Mean Difference (IV, Random, 95% CI) ‐0.09 [‐0.23, 0.06]
2.3.4 MD TRIPLE vs HD‐ICS/LABA 2 1967 Mean Difference (IV, Random, 95% CI) 0.01 [‐0.20, 0.21]
2.3.5 HD TRIPLE vs HD‐ICS/LABA 3 2887 Mean Difference (IV, Random, 95% CI) ‐0.07 [‐0.15, 0.00]
2.3.6 HD TRIPLE vs MD TRIPLE 2 1381 Mean Difference (IV, Random, 95% CI) ‐0.07 [‐0.23, 0.09]
2.3.7 DUAL vs TRIPLE 4 4253 Mean Difference (IV, Random, 95% CI) ‐0.04 [‐0.10, 0.02]

Comparison 3. Asthma Quality of Life Questionnaire: change from baseline.

Outcome or subgroup title No. of studies No. of participants Statistical method Effect size
3.1 CFB in AQLQ at 6 months 5   Mean Difference (IV, Fixed, 95% CI) Subtotals only
3.1.1 HD‐ICS/LABA vs MD‐ICS/LABA 1 1223 Mean Difference (IV, Fixed, 95% CI) ‐0.06 [‐0.14, 0.03]
3.1.2 HD TRIPLE vs HD‐ICS/LABA 1 907 Mean Difference (IV, Fixed, 95% CI) 0.16 [‐0.01, 0.34]
3.1.3 HD TRIPLE vs MD TRIPLE 1 1426 Mean Difference (IV, Fixed, 95% CI) 0.08 [‐0.09, 0.25]
3.1.4 TRIPLE vs DUAL 2 907 Mean Difference (IV, Fixed, 95% CI) 0.16 [‐0.01, 0.34]
3.2 CFB in AQLQ at 12 months 4   Mean Difference (IV, Fixed, 95% CI) Subtotals only
3.2.1 HD‐ICS/LABA vs MD‐ICS/LABA 2 2815 Mean Difference (IV, Fixed, 95% CI) ‐0.02 [‐0.08, 0.04]
3.2.2 MD TRIPLE vs MD‐ICS/LABA 1 1071 Mean Difference (IV, Fixed, 95% CI) ‐0.05 [‐0.15, 0.05]
3.2.3 HD TRIPLE vs MD‐ICS/LABA 1 1058 Mean Difference (IV, Fixed, 95% CI) 0.06 [‐0.04, 0.16]
3.2.4 MD TRIPLE vs HD‐ICS/LABA 1 1628 Mean Difference (IV, Fixed, 95% CI) ‐0.07 [‐0.16, 0.02]
3.2.5 HD TRIPLE vs HD‐ICS/LABA 3 2552 Mean Difference (IV, Fixed, 95% CI) 0.06 [‐0.02, 0.14]
3.2.6 TRIPLE vs DUAL 3 3623 Mean Difference (IV, Fixed, 95% CI) 0.01 [‐0.05, 0.07]

Comparison 4. Asthma Control Questionnaire responders.

Outcome or subgroup title No. of studies No. of participants Statistical method Effect size
4.1 ACQ responders at 6 months 7   Risk Ratio (M‐H, Random, 95% CI) Subtotals only
4.1.1 HD‐ICS/LABA vs MD‐ICS/LABA 3 3700 Risk Ratio (M‐H, Random, 95% CI) 1.02 [0.96, 1.08]
4.1.2 MD TRIPLE vs MD‐ICS/LABA 3 3063 Risk Ratio (M‐H, Random, 95% CI) 1.09 [0.99, 1.19]
4.1.3 HD TRIPLE vs MD‐ICS/LABA 2 1916 Risk Ratio (M‐H, Random, 95% CI) 1.11 [0.91, 1.35]
4.1.4 MD TRIPLE vs HD‐ICS/LABA 2 2487 Risk Ratio (M‐H, Random, 95% CI) 1.02 [0.96, 1.08]
4.1.5 HD TRIPLE vs HD‐ICS/LABA 4 4818 Risk Ratio (M‐H, Random, 95% CI) 1.07 [1.01, 1.14]
4.1.6 HD TRIPLE vs MD TRIPLE 3 2821 Risk Ratio (M‐H, Random, 95% CI) 0.99 [0.95, 1.03]
4.1.7 TRIPLE vs DUAL 5 7881 Risk Ratio (M‐H, Random, 95% CI) 1.09 [1.02, 1.15]
4.2 ACQ responders at 12 months 5   Risk Ratio (M‐H, Random, 95% CI) Subtotals only
4.2.1 HD‐ICS/LABA vs MD‐ICS/LABA 2 2817 Risk Ratio (M‐H, Random, 95% CI) 0.99 [0.90, 1.07]
4.2.2 MD TRIPLE vs MD‐ICS/LABA 2 2222 Risk Ratio (M‐H, Random, 95% CI) 1.01 [0.95, 1.07]
4.2.3 MD TRIPLE vs HD‐ICS/LABA 1 1088 Risk Ratio (M‐H, Random, 95% CI) 1.08 [1.01, 1.15]
4.2.4 MD TRIPLE vs HD‐ICS/LABA 1 1631 Risk Ratio (M‐H, Random, 95% CI) 0.97 [0.91, 1.03]
4.2.5 HD TRIPLE vs HD‐ICS/LABA 3 3982 Risk Ratio (M‐H, Random, 95% CI) 1.11 [0.99, 1.23]
4.2.6 HD TRIPLE vs MD TRIPLE 1 1089 Risk Ratio (M‐H, Random, 95% CI) 1.08 [1.01, 1.16]
4.2.7 TRIPLE vs DUAL 4 6204 Risk Ratio (M‐H, Random, 95% CI) 1.07 [0.99, 1.17]

Comparison 5. Serious adverse events, adverse events, and dropouts due to adverse event.

Outcome or subgroup title No. of studies No. of participants Statistical method Effect size
5.1 All cause SAEs 14   Risk Ratio (M‐H, Fixed, 95% CI) Subtotals only
5.1.1 HD‐ICS/LABA vs MD‐ICS LABA 8 7511 Risk Ratio (M‐H, Fixed, 95% CI) 1.03 [0.83, 1.29]
5.1.2 MD TRIPLE vs MD‐ICS/LABA 3 3187 Risk Ratio (M‐H, Fixed, 95% CI) 1.13 [0.85, 1.50]
5.1.3 HD TRIPLE vs MD‐ICS/LABA 2 2039 Risk Ratio (M‐H, Fixed, 95% CI) 1.05 [0.76, 1.47]
5.1.4 MD TRIPLE vs HD‐ICS/LABA 2 2660 Risk Ratio (M‐H, Fixed, 95% CI) 1.08 [0.81, 1.44]
5.1.5 HD TRIPLE vs HD‐ICS/LABA 4 5004 Risk Ratio (M‐H, Fixed, 95% CI) 0.95 [0.77, 1.18]
5.1.6 HD TRIPLE vs MD TRIPLE 3 2998 Risk Ratio (M‐H, Fixed, 95% CI) 0.96 [0.72, 1.27]
5.1.7 TRIPLE vs DUAL 6 8192 Risk Ratio (M‐H, Fixed, 95% CI) 1.03 [0.87, 1.21]
5.2 Asthma‐related SAEs 12   Risk Ratio (M‐H, Fixed, 95% CI) Subtotals only
5.2.1 HD‐ICS/LABA vs MD‐ICS LABA 6 6244 Risk Ratio (M‐H, Fixed, 95% CI) 1.33 [0.80, 2.21]
5.2.2 MD TRIPLE vs MD‐ICS/LABA 3 3188 Risk Ratio (M‐H, Fixed, 95% CI) 1.52 [0.85, 2.69]
5.2.3 HD TRIPLE vs MD‐ICS/LABA 2 2039 Risk Ratio (M‐H, Fixed, 95% CI) 0.86 [0.41, 1.80]
5.2.4 MD TRIPLE vs HD‐ICS/LABA 2 2660 Risk Ratio (M‐H, Fixed, 95% CI) 1.35 [0.77, 2.36]
5.2.5 HD TRIPLE vs HD‐ICS/LABA 4 5004 Risk Ratio (M‐H, Fixed, 95% CI) 0.86 [0.58, 1.27]
5.2.6 HD TRIPLE vs MD TRIPLE 3 3472 Risk Ratio (M‐H, Fixed, 95% CI) 0.57 [0.31, 1.05]
5.2.7 TRIPLE vs DUAL 6 8192 Risk Ratio (M‐H, Fixed, 95% CI) 1.04 [0.76, 1.42]
5.3 All cause AEs 13   Risk Ratio (M‐H, Random, 95% CI) Subtotals only
5.3.1 HD‐ICS/LABA vs MD‐ICS LABA 7 5949 Risk Ratio (M‐H, Random, 95% CI) 1.01 [0.97, 1.06]
5.3.2 MD TRIPLE vs MD‐ICS/LABA 3 3188 Risk Ratio (M‐H, Random, 95% CI) 0.96 [0.91, 1.00]
5.3.3 HD TRIPLE vs MD‐ICS/LABA 2 2039 Risk Ratio (M‐H, Random, 95% CI) 0.92 [0.85, 1.00]
5.3.4 MD TRIPLE vs HD‐ICS/LABA 2 2659 Risk Ratio (M‐H, Random, 95% CI) 0.99 [0.83, 1.18]
5.3.5 HD TRIPLE vs HD‐ICS/LABA 4 5004 Risk Ratio (M‐H, Random, 95% CI) 0.91 [0.87, 0.96]
5.3.6 HD TRIPLE vs MD TRIPLE 3 2998 Risk Ratio (M‐H, Random, 95% CI) 0.95 [0.89, 1.02]
5.3.7 TRIPLE vs DUAL 6 8192 Risk Ratio (M‐H, Random, 95% CI) 0.93 [0.90, 0.96]
5.4 Dropouts due to adverse event 14   Risk Ratio (M‐H, Random, 95% CI) Subtotals only
5.4.1 HD‐ICS/LABA vs MD‐ICS LABA 7 5969 Risk Ratio (M‐H, Random, 95% CI) 1.00 [0.68, 1.48]
5.4.2 MD TRIPLE vs MD‐ICS/LABA 3 3205 Risk Ratio (M‐H, Random, 95% CI) 0.42 [0.08, 2.14]
5.4.3 HD TRIPLE vs MD‐ICS/LABA 2 2670 Risk Ratio (M‐H, Random, 95% CI) 0.47 [0.19, 1.18]
5.4.4 MD TRIPLE vs HD‐ICS/LABA 2 2668 Risk Ratio (M‐H, Random, 95% CI) 1.24 [0.76, 2.02]
5.4.5 HD TRIPLE vs HD‐ICS/LABA 4 5018 Risk Ratio (M‐H, Random, 95% CI) 0.60 [0.38, 0.95]
5.4.6 HD TRIPLE vs MD TRIPLE 2 1765 Risk Ratio (M‐H, Random, 95% CI) 1.00 [0.29, 3.44]
5.4.7 TRIPLE vs DUAL 5 8223 Risk Ratio (M‐H, Random, 95% CI) 0.59 [0.33, 1.03]

Comparison 6. Severe exacerbations (high and low risk subgroups).

Outcome or subgroup title No. of studies No. of participants Statistical method Effect size
6.1 HD‐ICS/LABA vs MD‐ICS/LABA 5 4492 Risk Ratio (M‐H, Fixed, 95% CI) 1.49 [0.74, 3.01]
6.1.1 High Risk 1 1562 Risk Ratio (M‐H, Fixed, 95% CI) 8.27 [1.09, 62.72]
6.1.2 Low Risk 4 2930 Risk Ratio (M‐H, Fixed, 95% CI) 0.81 [0.35, 1.83]
6.2 MD TRIPLE vs MD‐ICS/LABA 1 813 Odds Ratio (M‐H, Fixed, 95% CI) 1.00 [0.35, 2.88]
6.2.1 Low Risk 1 813 Odds Ratio (M‐H, Fixed, 95% CI) 1.00 [0.35, 2.88]
6.3 HD TRIPLE vs MD‐ICS/LABA 1 815 Odds Ratio (M‐H, Fixed, 95% CI) 0.57 [0.16, 1.95]
6.3.1 Low Risk 1 815 Odds Ratio (M‐H, Fixed, 95% CI) 0.57 [0.16, 1.95]
6.4 MD TRIPLE vs HD‐ICS/LABA 1 812 Odds Ratio (M‐H, Fixed, 95% CI) 1.41 [0.44, 4.47]
6.4.1 Low Risk 1 812 Odds Ratio (M‐H, Fixed, 95% CI) 1.41 [0.44, 4.47]
6.5 HD TRIPLE vs HD‐ICS/LABA 2 1727 Odds Ratio (M‐H, Fixed, 95% CI) 0.79 [0.44, 1.44]
6.5.1 High Risk 1 913 Odds Ratio (M‐H, Fixed, 95% CI) 0.79 [0.40, 1.55]
6.5.2 Low Risk 1 814 Odds Ratio (M‐H, Fixed, 95% CI) 0.79 [0.21, 2.98]
6.6 HD TRIPLE vs MD TRIPLE 1 814 Odds Ratio (M‐H, Fixed, 95% CI) 0.56 [0.16, 1.94]
6.6.1 Low Risk 1 814 Odds Ratio (M‐H, Fixed, 95% CI) 0.56 [0.16, 1.94]
6.7 TRIPLE vs DUAL 2 2540 Odds Ratio (M‐H, Fixed, 95% CI) 0.84 [0.50, 1.41]
6.7.1 High Risk 1 913 Odds Ratio (M‐H, Fixed, 95% CI) 0.79 [0.40, 1.55]
6.7.2 Low Risk 1 1627 Odds Ratio (M‐H, Fixed, 95% CI) 0.91 [0.40, 2.08]

Comparison 7. Moderate to severe exacerbations (high and low risk subgroups).

Outcome or subgroup title No. of studies No. of participants Statistical method Effect size
7.1 HD‐ICS/LABA vs MD‐ICS/LABA 6 5452 Risk Ratio (M‐H, Fixed, 95% CI) 0.93 [0.82, 1.05]
7.1.1 High Risk 1 1830 Risk Ratio (M‐H, Fixed, 95% CI) 0.97 [0.83, 1.14]
7.1.2 Low Risk 5 3622 Risk Ratio (M‐H, Fixed, 95% CI) 0.87 [0.71, 1.07]
7.2 MD TRIPLE vs MD‐ICS/LABA 3 3184 Risk Ratio (M‐H, Fixed, 95% CI) 0.86 [0.75, 0.98]
7.2.1 High Risk 2 2371 Risk Ratio (M‐H, Fixed, 95% CI) 0.84 [0.72, 0.98]
7.2.2 Low Risk 1 813 Risk Ratio (M‐H, Fixed, 95% CI) 0.94 [0.70, 1.25]
7.3 HD TRIPLE vs MD‐ICS/LABA 1 815 Risk Ratio (M‐H, Fixed, 95% CI) 0.74 [0.54, 1.01]
7.3.1 Low Risk 1 815 Risk Ratio (M‐H, Fixed, 95% CI) 0.74 [0.54, 1.01]
7.4 MD TRIPLE vs HD‐ICS/LABA 2 2651 Risk Ratio (M‐H, Fixed, 95% CI) 1.00 [0.86, 1.15]
7.4.1 High Risk 1 1839 Risk Ratio (M‐H, Fixed, 95% CI) 0.93 [0.78, 1.09]
7.4.2 Low Risk 1 812 Risk Ratio (M‐H, Fixed, 95% CI) 1.26 [0.92, 1.74]
7.5 HD TRIPLE vs HD‐ICS/LABA 4 4989 Risk Ratio (M‐H, Fixed, 95% CI) 0.83 [0.75, 0.92]
7.5.1 High Risk 3 4175 Risk Ratio (M‐H, Fixed, 95% CI) 0.81 [0.73, 0.91]
7.5.2 Low Risk 1 814 Risk Ratio (M‐H, Fixed, 95% CI) 1.00 [0.71, 1.40]
7.6 HD TRIPLE vs MD TRIPLE 3 2996 Risk Ratio (M‐H, Fixed, 95% CI) 0.86 [0.72, 1.02]
7.6.1 High Risk 2 2182 Risk Ratio (M‐H, Fixed, 95% CI) 0.89 [0.73, 1.09]
7.6.2 Low Risk 1 814 Risk Ratio (M‐H, Fixed, 95% CI) 0.79 [0.57, 1.08]
7.7 TRIPLE vs DUAL 4 7887 Risk Ratio (M‐H, Fixed, 95% CI) 0.86 [0.79, 0.93]
7.7.1 High Risk 3 6260 Risk Ratio (M‐H, Fixed, 95% CI) 0.84 [0.77, 0.92]
7.7.2 Low Risk 1 1627 Risk Ratio (M‐H, Fixed, 95% CI) 0.96 [0.77, 1.20]

7.1. Analysis.

7.1

Comparison 7: Moderate to severe exacerbations (high and low risk subgroups), Outcome 1: HD‐ICS/LABA vs MD‐ICS/LABA

7.2. Analysis.

7.2

Comparison 7: Moderate to severe exacerbations (high and low risk subgroups), Outcome 2: MD TRIPLE vs MD‐ICS/LABA

7.3. Analysis.

7.3

Comparison 7: Moderate to severe exacerbations (high and low risk subgroups), Outcome 3: HD TRIPLE vs MD‐ICS/LABA

7.4. Analysis.

7.4

Comparison 7: Moderate to severe exacerbations (high and low risk subgroups), Outcome 4: MD TRIPLE vs HD‐ICS/LABA

7.5. Analysis.

7.5

Comparison 7: Moderate to severe exacerbations (high and low risk subgroups), Outcome 5: HD TRIPLE vs HD‐ICS/LABA

Characteristics of studies

Characteristics of included studies [ordered by study ID]

Bernstein 2011.

Study characteristics
Methods DESIGN: randomised controlled trial
GROUP: parallel group
DURATION OF THE STUDY: 12 weeks
SPONSORSHIP SOURCE: Merck Sharp & Dohme
COUNTRY: Canada, Colombia, Costa Rica, Czech Republic, Ecuador, Estonia, Finland, Former Serbia and Montenegro, Germany, Latvia, Lithuania, the Netherlands, Puerto Rico, Romania, Russian Federation, Serbia, Slovenia, Ukraine, United
Participants BASELINE CHARACTERISTICS:
No. of patients included in this review: 722
Mean age: 44.9
Male %: 86
White %: 86
Current and Ex smoker excluded: yes. > 10 PYs for ex‐smokers
Baseline FEV1 (L) pre‐bronchodilator: 2.33
Baseline FEV1 % predicted: 74.1
Hx of asthma exacerbation: not required
 
INCLUSION CRITERIA: participants must have a diagnosis of asthma for at least 12 months' duration. A participant must have been using a medium daily dose of inhaled glucocorticosteroids (alone or in combination with LABA) for at least 12 weeks and must have been on a stable regimen for at least 2 weeks prior to Screening. If there is no inherent harm in changing the participant's current asthma therapy, the participant must be willing to discontinue his/her prescribed ICS or ICS/LABA prior to initiating MF MDI run‐in medication. The diagnosis of asthma must be documented by either demonstrating an increase in absolute fFEV1 of at least 12% and a volume increase of at least 200 mL within approximately 15 to 20 minutes after administration of 4 inhalations of albuterol/salbutamol or of nebulised SABA or PEF variability of more than 20% or a diurnal variation PEF of more than 20% based on the difference between pre‐bronchodilator (before taking albuterol/salbutamol) morning value and the post‐bronchodilator value (after taking albuterol/salbutamol) from the evening before, expressed as a percentage of the mean daily PEF value on any day during the open‐label Run‐in Period. A participant must have a history of >: 2 asthma‐related unscheduled visits to a physician or to an emergency room within the past year AND >: 3 asthma‐related unscheduled visits within the past 2 years. Prior to randomisation participants must have used a total of 12 or more inhalations of SABA rescue medication during the last 10 days of run‐in. Clinical laboratory tests (complete blood counts (CBC), blood chemistries, including serum pregnancy for females of child‐bearing potential, and urinalysis) conducted at the Screening Visit must be within normal limits or clinically acceptable to the investigator/sponsor before the participant is instructed to start using open‐label MF MDI run‐in medication. An ECG performed at the Screening Visit, using a centralised trans‐telephonic technology, must be clinically acceptable to the investigator. A chest x‐ray performed at the Screening Visit, or within 12 months prior to the Screening Visit, must be clinically acceptable to the investigator. A non‐pregnant female participant of childbearing potential must be using a medically acceptable, adequate form of birth control. A female participant of childbearing potential must have a negative serum pregnancy test at Screening in order to be considered eligible for enrolment.
EXCLUSION CRITERIA: a participant who demonstrates a change in absolute FEV1 of > 20% at any time between the Screening and Baseline Visits on any 2 consecutive days between the Screening and Baseline visits. A participant who requires the use of greater than 8 inhalations per day of SABA MDI or 2 or more nebulised treatments per day of 2.5 mg SABA on any 2 consecutive days between the Screening and Baseline Visits. A participant who experiences a decrease in AM or PM PEF below the Run‐in Period stability limit on any 2 consecutive days prior to randomisation. The average AM and average PM PEF respective values from the preceding 7 days are added, divided by the number of non‐missing values, and multiplied by 0.70 to determine the stability limit. A participant who experiences a clinical asthma exacerbation: defined as a clinical deterioration of asthma as judged by the clinical investigator between the Screening and Baseline Visits, that results in emergency treatment, hospitalisation due to asthma, or treatment with additional, excluded asthma medication (including oral or other systemic corticosteroids, but allowing SABA).
Interventions FP/SAL 250/50 µg twice daily
MF/FM 200/10 µg twice daily
Outcomes Moderate to severe exacerbations
All‐cause serious adverse events
All‐cause adverse events
Asthma‐related serious adverse events
Dropouts due to adverse event
Notes Intragroup comparison of MD‐ICS/LABAs. NMA only. NCT00424008

Bernstein 2015.

Study characteristics
Methods DESIGN: randomised controlled trial
GROUP: Parallel group
DURATION OF THE STUDY: 12 weeks
SPONSORSHIP SOURCE: GlaxoSmithKline
COUNTRY: Argentina, Chile, Germany, Mexico, Netherlands, Poland, Romania, Russian Federation, Sweden, Ukraine, USA
Participants BASELINE CHARACTERISTICS:
No. of patients included in this review: 692
Mean age: 45.3
Male %: 38
White %: 88
Current and Ex smoker excluded: Yes. > 10 PYs for ex‐smokers
Baseline FEV1 (L) pre‐bronchodilator: 1.97
Baseline FEV1 % predicted: 62.4
Hx of asthma exacerbation: Not required (71% did not have a hx of exacerbations)
INCLUSION CRITERIA: participants must give their signed and dated (written) informed consent to participate. Written informed consent must be obtained if a participant's current medication is changed as a result of study participation Outpatient >12 years of age at Visit 1 who have had a diagnosis of asthma, as defined by the National Institutes of Health. Countries with local restrictions prohibiting enrolment of adolescents will only enrol subjects >18 years of age Male or an eligible female. Eligible female is defined as having non‐childbearing potential or having childbearing potential and using an acceptable method of birth control consistently and correctly. Best pre‐bronchodilator FEV1 of 40% to 80% of their predicted normal value. Demonstrate ≥ 12% and ≥ 200 mL reversibility of FEV1 within 10 to 40 minutes following 4 inhalations of albuterol/salbutamol inhalation aerosol (or an equivalent nebulised treatment with albuterol/salbutamol solution) or have documented reversibility testing within the 6 months prior to Visit 1 meeting this measure of reversibility. A spacer device may be used for testing, if required. If participants have received ICS for at least 12 weeks prior to Visit 1 and their treatment during the 4 weeks immediately prior to Visit 1 consisted of either of the two regimens (a or b).a.) A stable mid‐dose or high‐dose of ICS alone (e.g., ≥ FP 250 µg twice daily) or b.) A stable dose of a mid‐dose ICS/LABA combination (e.g., FP/Salm 250/50 µg twice daily) or an equivalent combination via separate inhalers. Use of ICS/LABA are not permitted with LABA on the day of Visit 1. Must be able to replace current SABA treatment with albuterol/salbutamol aerosol inhaler at Visit 1 for use as needed, during the study. Participants must be able to withhold albuterol/salbutamol for at least 6 hours prior to study visits.
EXCLUSION CRITERIA: history of life‐threatening asthma, defined as an asthma episode that required intubation and/or was associated with hypercapnia, respiratory arrest or hypoxic seizures within the last 5 years. Upper or lower respiratory tract, sinus, or middle ear that is: not resolved within 4 weeks of Visit 1 and led to a change in asthma management or, in the opinion of the investigator, expected to affect the participant's asthma status or the participant's ability to participate in the study. Any asthma exacerbation that required oral corticosteroids within the 12 weeks prior to Visit 1 or, resulted in an overnight hospitalisation requiring additional treatment for asthma within 6 months prior to Visit 1. A subject must not have current evidence of atelectasis (segmental or larger), bronchopulmonary dysplasia, COPD, or any evidence of concurrent respiratory disease other than asthma A subject must not have any clinically significant, uncontrolled condition or disease state that, in the opinion of the investigator, would put the safety of the subject at risk through study participation or would confound the interpretation of the efficacy results if the condition/disease exacerbated during the study Chronic stable hepatitis B or C are acceptable provided their screening ALT is < 2x uULN and the y otherwise meet the entry criteria. Chronic co‐infection with both hepatitis B and hepatitis C are not eligible Clinical visual evidence of candidiasis at Visit 1 Use of any investigational drug within 30 days prior to Visit 1 or within five half‐lives (t½), whichever is longer of the two. Allergies to drug or milk protein: any adverse reaction, to any beta2‐agonist, sympathomimetic drug, or any intranasal, inhaled, or systemic corticosteroid therapy or known or suspected sensitivity to the constituents of the NDPI, or history of severe milk protein allergy Administration of medication that would significantly affect the course of asthma, or interact with study drug Use of immunosuppressive medications during the study. Use of potent CYP3A4 inhibitor within 4 weeks of Visit 1. A subject or his/her parent or legal guardian has any infirmity, disability, disease, or resides in a geographical location which seems likely, in the opinion of the Investigator, to impair compliance with any aspect of this study protocol, including visit schedule, and completion of the daily diaries. Current smoker or has a smoking history of 10 pack‐years (20 cigarettes/day for 10 years). A subject may not have used inhaled tobacco products within the past 3 months (i.e., cigarettes, cigars, or pipe tobacco). If participant is an immediate family member of the participating investigator, sub‐investigator, study coordinator, or employee of the participating investigator. Participant previously randomised to treatment with FF/VI or FF in another Phase III study. Participants working on night shift a week prior to Visit 1 or during the study period. Adolescents who are wards of the state or government
SYMPTOM CRITERIA: asthma symptoms (a score of 3 on the combined day‐ and nighttime asthma symptom scale) and/or daily salbutamol use on 4 of the last 7 days of the run‐in period.
Interventions MD‐ICS/LABA
HD‐ICS/LABA
Outcomes Moderate to severe exacerbations
Severe exacerbations
All‐cause serious adverse events
All‐cause adverse events
Dropouts due to adverse event
 
Notes NCT01686633
Clinical Study Report available at https://www.gsk‐studyregister.com/en/trial‐details/?id=116863

Bodzenta‐Lukaszyk 2012.

Study characteristics
Methods DESIGN: randomised controlled trial
GROUP: parallel group
DURATION OF THE STUDY: 12 weeks
SPONSORSHIP SOURCE: Mundipharma Research Ltd
COUNTRY: Bulgaria, Hungary, India, Poland, Romania
Participants BASELINE CHARACTERISTICS:
No. of patients included in this review: 279
Mean age: 49
Male %: 32
White %: 96
Current and Ex smoker excluded: yes. > 10 PYs for ex‐smokers
Baseline FEV1 (L) pre‐bronchodilator: not reported
Baseline FEV1 % predicted: 64.4
Hx of asthma exacerbation: Not required.
Inclusion Criteria:
  1. Male or female participants at least 12 years old

  2. Female participants less than 1 year post‐menopausal must have a negative urine pregnancy test recorded at the screening visit prior to the first dose of study medication, be non‐lactating, & willing to use adequate & highly effective methods of contraception throughout the study. A highly effective method of birth control is defined as those which result in a low failure rate (i.e., less than 1% per year) when used consistently & correctly such as sterilisation, implants, injectables, combined oral contraceptives, some IUDs (Intrauterine Device, hormonal), sexual abstinence or vasectomised partner.

  3. Known history of moderate to severe persistent, reversible asthma for ≥ 6 months prior to the Screening Visit characterised by: Treatment with an ICS at a dose of 250 µ to  1000 µg fluticasone or equivalent OR Treatment with ICS at a dose of 200 µ to500 µg fluticasone or equivalent in combination with a LABA.

  4. Demonstrated a FEV1 of ≥ 50% to ≤ 80% for predicted normal values (Quanjer et al., 1993 (adults), & 1995 (adolescents)) during the Screening Period (Visit 1 or Visit 2) following appropriate withholding of asthma medications (if applicable).No β2‐agonist use on day of testingNo use of inhaled combination asthma therapy on day of testing.Inhaled corticosteroids are allowed on day of testing.

  5. Documented reversibility of ≥ 15% in FEV1 at visit 1 or visit 2.

  6. Demonstrated satisfactory technique in the use of the study medications i.e. pMDI and DPI devices.

  7. Willing & able to enter information in the electronic diary & attend all study visits.

  8. Willing & able to substitute study medication for their pre study prescribed asthma medication for the duration of the study.

  9. Written informed consent obtained. Inclusion criteria required following run‐in: Participant has used rescue medication for at least 3 days & had at least 1 night with sleep disturbance (i.e. sleep disturbance score of ≥ 1) during the last 7 days of the run in period,OR participant has used rescue medication for at least 3 days & had at least 3 days with asthma symptoms (i.e., a symptom score of ≥ 1) during the last 7 days of the run‐in period.


Exclusion criteria:
  1. Near fatal or life‐threatening (including intubation) asthma within the past year.

  2. Hospitalisation or an emergency visit for asthma within the 4 weeks before the Screening Visit.

  3. Known history of systemic (injectable or oral) corticosteroid medication use within 1 month of the Screening Visit.

  4. Known history of omalizumab use within the past 6 months.

  5. Current evidence or known history of any clinically significant disease or abnormality including uncontrolled coronary artery disease, congestive heart failure, myocardial infarction, or cardiac dysrhythmia. 'Clinically significant' is defined as any disease that, in the opinion of the Investigator, would put the subject at risk through study participation, or which would affect the outcome of the study.

  6. In the investigator's opinion a clinically significant upper or lower respiratory infection within 4 weeks prior to the Screening Visit.

  7. Significant, non‐reversible, active pulmonary disease (e.g., cCOPD, cystic fibrosis, bronchiectasis, tuberculosis).

  8. Known HIV‐positive status.

  9. Participant has a smoking history equivalent to "10 pack years" (i.e., at least 1 pack of 20 cigarettes/day for 10 years or 10 packs/day for 1 year, etc.).

  10. Current smoking history within 12 months prior to the Screening Visit.

  11. Current evidence or known history of alcohol and/or substance abuse within 12 months prior to the Screening Visit.

  12. Participant has taken B‐blocking agents, tricyclic antidepressants, monoamine oxidase inhibitors, astemizole (Hismanal), quinidine type antiarrhythmics, or potent CYP 3A4 inhibitors such as ketoconazole within the past week.

  13. Current use of medications other than those allowed in the protocol that will have an effect on bronchospasm &/or pulmonary function.

  14. Current evidence or known history of hypersensitivity or idiosyncratic reaction to test medications or components.

  15. Participant has received an investigational drug within 30 days of the Screening Visit (12 weeks if an oral or injectable steroid).

  16. Participant is currently participating in a clinical study.

Interventions FP/FM 250/10 µg twice daily
BUD/FM 400/12 µg twice daily
Outcomes Moderate to severe exacerbations
Severe exacerbations
All‐cause adverse events
Asthma‐related serious adverse events
Dropouts due to adverse event
Notes Intragroup comparison of MD‐ICS/LABAs. NMA only. NCT01099722

Busse 2008.

Study characteristics
Methods DESIGN: randomised controlled trial
GROUP: parallel group
DURATION OF THE STUDY: 24 weeks
SPONSORSHIP SOURCE: AstraZeneca
COUNTRY: USA
Participants BASELINE CHARACTERISTICS:
No. of patients included in this review: 833
Mean age: 39.1
Male %: 38
White %: 83
Current and Ex smoker excluded: Yes. > 20 PYs for ex‐smokers
Baseline FEV1 (L) pre‐bronchodilator: 2.55
Baseline FEV1 % predicted: 78.6
Hx of asthma exacerbation: Not required.
Inclusion Criteria:
  • Diagnosis of asthma

  • Baseline lung function tests as determined by protocol

  • Required and received treatment with ICS within timeframe and doses specified in protocol


Exclusion Criteria:
  • Has required treatment with any non‐inhaled corticosteroid within previous 30 days, sensitivity to drugs specified in the protocol, or requires treatment with a beta‐blockers

  • Had cancer within previous 5 years or currently has any other significant disease or disorder as judged by the investigator

Interventions FP/SAL 250/50 µg twice daily
BUD/FM 320/9 µg twice daily
Outcomes Moderate to severe exacerbations
Severe exacerbations
Dropouts due to adverse event
Notes Intragroup comparison of MD‐ICS/LABAs. NMA only. NCT00646594
Clinical Study Report available at https://www.gsk‐studyregister.com/en/trial‐details/?id=106839

Cukier 2013.

Study characteristics
Methods DESIGN: randomised controlled trial
GROUP: Parallel group
DURATION OF THE STUDY: 12 weeks
SPONSORSHIP SOURCE: Libbs Pharmaceutical Ltd
COUNTRY: 11 research centres in Brazil
Participants BASELINE CHARACTERISTICS:
No. of patients included in this review: 196
Mean age: 35.1
Male %:26
White %: 69
Current and Ex smoker excluded: Yes. > 10 PYs for ex‐smokers
Baseline FEV1 (L) pre‐bronchodilator: 2.5
Baseline FEV1 % predicted: 85.3
Hx of asthma exacerbation: Not required.
Inclusion criteria
1. Male or female from 18 to 65 years old with known history of asthma according toGINA update 2008 criteria for at least three months.
2. Patients with partially controlled or non‐controlled asthma using therapeutic doses of ICS combined with LABA (daily doses equal or more than 400 mcg of budesonide or similar drugs) for at least four weeks
3. FEV1 > 60 % of predicted normal value
4. Willing and able to keep diary and attend all visits
5. Written informed consent obtained
Exclusion criteria
1. Pregnant or nursing women
2. Females of childbearing potential without an effective method of birth control
3. Use of systemic corticosteroid within 30 days before randomisation
4. Three or more treatments with oral corticosteroid or history of asthma hospitalisation in the previous six months
5. Use of the following drugs within two weeks before randomisation:
5.1. meltixantines
5.2. monoaminurias
5.3. beta‐blockers
5.4. acetylcysteine
5.5. carbocisteine
5.6. tricyclic antidepressive
5.7. sodium channel blockers
5.8. leukotriene
5.9. anticholinergic
5.10. phenothiazines
5.11. immunotherapy
5.12. levodopa
5.13. ritonavir
5.14. oral ketoconazole
6. Current evidence of history of hypersensitivity to the study drug
7. Evidence of non‐adhesion to the treatment during run‐in phase
8. A smoking history equivalent to "10 pack years" (i.e., at least 1 pack of 20 cigarettes/day for 10 years or 10 packs/day for 1 year, etc)
9. Clinically significant laboratory test results during the screening phase
10. Morning serum level of cortisol < 5 mcg/dL
11. Inability to perform the lung function test
12. Current evidence of other pulmonary disease
13. Patients with asthma exacerbation during the run‐in period
14. Evidence of clinically significant oral candidiasis
Interventions FP/FM 250/12 µg twice daily
BUD/FM 400/12 µg twice daily
Outcomes Moderate to severe exacerbations
All‐cause serious adverse events
All‐cause adverse events
Dropouts due to adverse event
Notes Intragroup comparison of MD‐ICS/LABAs. NMA only. ISRCTN60408425

Gessner 2020.

Study characteristics
Methods DESIGN: randomised controlled trial
GROUP: parallel group
DURATION OF THE STUDY: 24 weeks
SPONSORSHIP SOURCE: Novartis
COUNTRY: Argentina, Chile, Colombia, Czechia, Germany, Greece, Hungary, India, Israel, Mexico, Peru, Poland, Russian Federation, Serbia, Slovakia, South Africa, Spain, Taiwan, Turkey, Vietnam
Participants BASELINE CHARACTERISTICS:
No. of patients included in this review: 1426
Mean age: 52.6
Male %: 37
White %: 83
Current and Ex smoker excluded: Yes. > 10 PYs for ex‐smokers
Baseline FEV1 (L) pre‐bronchodilator: not reported.
Baseline FEV1 % predicted: 63
Hx of asthma exacerbation: required a history of at least one asthma exacerbation that required medical care from a physician, emergency room visit or hospitalisation and systemic corticosteroid in the previous year.
Inclusion Criteria:
  • Patients with a diagnosis of asthma for a period of at least 6 months prior to Visit 1 with current asthma severity ≥ step 4 (GINA 2017).

  • Patients who had used ICS/LABA combinations for asthma for at least 3 months and at stable medium or high dose of ICS/LABA for at least 1 month prior to Visit 1.

  • Patients were required to be symptomatic at screening despite treatment with medium or high stable doses of ICS/LABA as defined by ACQ‐7 score ≥ 1.5 at visits 101 and 201 (randomisation visit).

  • Patients with history of at least one severe asthma exacerbation which required medical care from a physician, emergency room visit (or local equivalent structure) or hospitalisation in the 12 months prior to Visit 1 and required systemic corticosteroid treatment for at least 3 days including physician guided self‐management treatment with oral corticosteroids as part of written asthma action plan.

  • Pre‐bronchodilator FEV1 of < 85 % of the predicted normal value for the patient after withholding bronchodilators prior to spirometry at both Visit 101 and Visit 201.

  • Patients who demonstrated an increase in FEV1 of ≥ 12% and 200 mL.


Exclusion Criteria:
  • Patients who had a smoking history > 20 pack years.

  • Patients diagnosed with COPD.

  • Patients who had an asthma attack/exacerbation requiring systemic steroids or hospitalisation or emergency room visit within 6 weeks of Visit 1 (Screening).

  • Patients treated with a LAMA for asthma within 3 months prior to Visit 1.

  • Patients who had a respiratory tract infection or clinical significant asthma worsening as defined by Investigator within 4 weeks prior to Visit 1 or between Visit 1 and Visit 201.

Interventions LD TRIPLE: MF/GLY/IND µg 80/50/150 daily
MD TRIPLE: MF/GLY/IND µg 160/50/150 daily
HD TRIPLE: FP/SAL 500/50 µg twice daily + Tio 5 µg daily
Outcomes Moderate to severe exacerbations
All‐cause serious adverse events
All‐cause adverse events
Asthma‐related serious adverse events
Dropouts due to adverse event
ACQ responder at 6 months
CFB in ACQ at 3 months
CFB in ACQ at 6 months
CFB in AQLQ at 3 months
CFB in AQLQ at 6 months
Notes NCT03158311

Kerstjens 2012.

Study characteristics
Methods DESIGN: randomised controlled trial
GROUP: parallel group
DURATION OF THE STUDY: 48 weeks
SPONSORSHIP SOURCE: Boehringer Ingelheim
COUNTRY: Australia, Canada, Denmark, Germany, Italy, Japan, the,Russian Federation, Serbia, South Africa, Turkey, Ukraine,the UK, the USA
Participants BASELINE CHARACTERISTICS:
No. of patients included in this review: 3092
Mean age: 52.2
Male %: 38
White %: 74
Current and Ex smoker excluded: Yes. > 10 PYs for ex‐smokers
Baseline FEV1 (L) pre‐bronchodilator: 1.6
Baseline FEV1 % predicted: 54.8
Hx of asthma exacerbation: Required at least one asthma exacerbation that required medical care from a physician, emergency room visit, hospitalisation, and systemic corticosteroid treatment in the previus year.
Inclusion criteria:
  1. All patients must sign and date an Informed Consent Form consistent with ICH‐GCP guidelines and local legislation prior to participation in the trial (i.e. prior to any trial procedures, including any pre‐trial washout of medications and medication restrictions for pulmonary function test at Visit 1).

  2. Male or female patients aged at least 18 years but not more than 75 years.

  3. All patients must have at least a 5‐year history of asthma at the time of enrolment into the trial and the diagnosis of asthma must have been made before the patient's age of 40.

  4. All patients must have a diagnosis of severe persistent asthma and must be symptomatic despite treatment with high, stable doses of ICS and a LABA

  5. All patients must have a history of one or more asthma exacerbation in the past year.

  6. Patients must have evidence of treated, severe, persistent asthma in post bronchodilator pulmonary function tests.

  7. Patients should be never‐smokers or ex‐smokers who stopped smoking at least one year prior to enrolment and who have a smoking history of less than 10 pack years

  8. Patients must be able to use the Respimat® inhaler correctly

  9. Patients must be able to perform all trial related procedures including technically acceptable pulmonary function tests and use of the electronic diary/peak flow meter.


Exclusion criteria:
  1. Patients with a significant disease other than asthma. A significant disease is defined as a disease which, in the opinion of the investigator, may (i) put the patient at risk because of participation in the trial, or (ii) influence the results of the trial, or (iii) cause concern regarding the patient's ability to participate in the trial.

  2. Patients with clinically relevant abnormal screening haematology or blood chemistry.

  3. Patients with a recent history (i.e. six months or less) of myocardial infarction, hospitalisation for cardiac failure during the past year, any unstable or life‐threatening cardiac arrhythmia or cardiac arrhythmia requiring intervention or a change in drug therapy within the past year, known active tuberculosis, malignancy for which the patient has undergone resection, radiation therapy or chemotherapy within the last five years (treated basal cell carcinoma allowed), lung diseases other than asthma (e.g. COPD), significant alcohol or drug abuse within the past two years, patients who have undergone thoracotomy with pulmonary resection. Patients with a history of thoracotomy for other reasons should be evaluated as per exclusion criterion No. 1.

  4. Patients who are currently in a pulmonary rehabilitation programme or have completed a pulmonary rehabilitation programme in the 6 weeks prior to the screening visit (Visit 1).

  5. Patients using OCS medication at stable doses exceeding 5 mg prednisolone or prednisolone equivalent every day or 10 mg prednisolone or prednisolone equivalent every second day.

  6. Patients with known hypersensitivity to anticholinergic drugs, BAC, EDTA or any other components of the tiotropium inhalation solution.

  7. Pregnant or nursing women or women of childbearing potential not using a highly effective method of birth control. Female patients will be considered to be of childbearing potential unless surgically sterilised by hysterectomy or bilateral tubal ligation/salpingectomy, or post‐menopausal for at least two years.

  8. Patients who have taken an investigational drug within four weeks or six half‐lives (whichever is greater) prior to Visit 1.

  9. Patients who have been treated with the long‐acting anticholinergic tiotropium (Spiriva®), beta‐blocker medication, oral beta‐adrenergics, other non‐approved and according to international guidelines not recommended 'experimental' drugs for routine asthma therapy (e.g. TNF‐alpha blockers, methotrexate, cyclosporin) within four weeks prior to the Screening Visit (Visit 1) or during the screening period.

  10. Patients with any asthma exacerbation or respiratory tract infection in the four weeks prior to the trial.

  11. Patients who have previously been randomised in this trial or in the respective twin trial (205.416 versus 205.417) or are currently participating in another trial.

  12. Patients with a known narrow‐angle glaucoma.

Interventions HD‐ICS/LABA (Not specified)
HD TRIPLE (Not specified)
Outcomes Moderate to severe exacerbations
Severe exacerbations
All‐cause serious adverse events
All‐cause adverse events
Asthma‐related serious adverse events
Dropouts due to adverse event
ACQ responder at 6 months
ACQ responder at 12 months
CFB in ACQ at 6 months
CFB in ACQ at 12 months
CFB in AQLQ at 6 months
CFB in AQLQ at 12 months
Notes NCT00772538, NCT00776984

Kerstjens 2012a.

Study characteristics
Methods See Kerstjens 2012
Participants  
Interventions  
Outcomes  
Notes NCT00772538

Kerstjens 2012b.

Study characteristics
Methods See Kerstjens 2012
Participants  
Interventions  
Outcomes  
Notes NCT00776984

Kerstjens 2020.

Study characteristics
Methods DESIGN: randomised controlled trial
GROUP: parallel group
DURATION OF THE STUDY: 26‐52 weeks
SPONSORSHIP SOURCE: Novartis
COUNTRY: Argentina, Austria, Belgium, Bulgaria, Canada, Chile, China, Colombia, Croatia, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, India, Ireland, Israel, Italy, Japan, Jordan, Latvia, Lebanon, Lithuania, Mexico, the Netherlands, Peru, Philippines, Poland, Portugal, Romania, Russian Federation, Slovakia, South Africa, Spain, Sweden, Switzerland, Thailand, the UK, Vietnam
Participants BASELINE CHARACTERISTICS:
No. of patients included in this review: 3092
Mean age: 52.2
Male %: 38
White %: 74
Current and Ex smoker excluded: Yes. > 10 PYs for ex‐smokers
Baseline FEV1 (L) pre‐bronchodilator: 1.6
Baseline FEV1 % predicted: 54.8
Hx of asthma exacerbation: required at least one asthma exacerbation that required medical care from a physician, emergency room visit, hospitalisation, and systemic corticosteroid treatment in the previus year.
Inclusion Criteria:
  • Patients with a diagnosis of asthma, (GINA 2015) for a period of at least 1 year prior to Visit 1 (Screening).

  • Patients who have used medium or high dose of ICS/LABA combinations for asthma for at least 3 months and at stable medium or high doses of ICS/LABA for at least 1 month prior to Visit 1.

  • Patients must be symptomatic at screening despite treatment with mid or high stable doses of ICS/LABA. Patients with ACQ‐7 score ≥ 1.5 at Visit 101 and at Visit 102 (before randomisation).

  • Patients with documented history of at least one asthma exacerbation which required medical care from a physician, ER visit (or local equivalent structure) or hospitalisation in the 12 months prior to Visit 1, and required systemic corticosteroid treatment.

  • Pre‐bronchodilator FEV1 of < 80 % of the predicted normal value for the patient according to ATS/ERS guidelines after withholding bronchodilators at both visits 101 and 102.

  • Withholding period of bronchodilators prior to spirometry: SABA for ≥ 6 hours, Twice daily LABA (or FDC of ICS/LABA) for ≥ 12 hours, Once daily LABA (or FDC of ICS/LABA) for ≥ 24 hours, SAMA for ≥ 8 hours, Short‐acting xanthines for 12 hrs, Long‐acting xanthines for 24 hours,

  • Washout period of each drug should be kept as close as possible as above and should not be longer. If longer washout period is needed due to scheduling issues, please contact Novartis Medical monitor.

  • A one‐time repeat of percentage predicated FEV1 (Pre‐bronchodilator) at Visit 101 and/or Visit 102 is allowed in an ad‐hoc visit. Repeat of Visit 101 spirometry should be done in an ad‐hoc visit to be scheduled on a date that would provide sufficient time to receive confirmation from the spirometry data central reviewer of the validity of the assessment before randomisation. Run‐in medication should be dispensed once spirometry assessment met inclusion criteria (ATS/ERS quality criteria, FEV1 % predicted normal value, and reversibility) as per equipment

  • A one‐time rescreen is allowed in case the patient fails to meet the criteria at the repeat, provided the patient returned to the required treatment as per inclusion criteria 4

  • Patients who demonstrate an increase in FEV1 of 12% and 200 mL within 30 minutes after administration of 400 µg salbutamol/360 µg albuterol (or equivalent dose) at Visit 101.All patients must perform a reversibility test at Visit 101. If reversibility is not demonstrated at Visit 101 then one of the following criteria need to be met.

  • Reversibility should be repeated once.

  • Patients may be permitted to enter the study with historical evidence of reversibility that was performed according to ATS/ERS guidelines within 2 years prior to Visit 1.

  • Alternatively, patients may be permitted to enter the study with a historical positive bronchoprovocation test that was performed within 2 years prior to Visit 1. If reversibility is not demonstrated at Visit 101 (or after repeated assessment in an ad‐hoc visit) and historical evidence of reversibility/bronchoprovocation is not available (or was not performed according to the ATS/ERS guidelines patients must be screen‐failed

  • Spacer devices are permitted during reversibility testing only. The Investigator or delegate may decide whether or not to use a spacer for the reversibility testing


Exclusion Criteria:
  • Patients who have had an asthma attack/exacerbation requiring systemic steroids or hospitalisation or emergency room visit within 6 weeks of Visit 1 (Screening). If patients experience an asthma attack/exacerbation requiring systemic steroids or hospitalisation or emergency room visit between Visit 1 and Visit 102 they may be re‐screened 6 weeks after recovery from the exacerbation.

  • Patients who have ever required intubation for a severe asthma attack/exacerbation.

  • Patients who have a clinical condition which is likely to be worsened by ICS administration (e.g. glaucoma, cataract and fragility fractures) who are according to investigator's medical judgement at risk participating in the study.

  • Patients treated with a LAMA for asthma within 3 months prior Visit 1 (Screening).

  • Patients with narrow‐angle glaucoma, symptomatic BPH or bladder‐neck obstruction or severe renal impairment or urinary retention. BPH patients who are stable on treatment can be considered).

  • Patients who have had a respiratory tract infection or asthma worsening as determined by investigator within 4 weeks prior to Visit 1 (Screening) or between Visit 1 and Visit 102. Patients may be re‐screened 4 weeks after recovery from their respiratory tract infection or asthma worsening.

  • Patients with evidence upon visual inspection (laboratory culture is not required) of clinically significant (in the opinion of investigator) oropharyngeal candidiasis at Visit 102 or earlier, with or without treatment. Patients may be re‐screened once their candidiasis has been treated and has resolved.

  • Patients with any chronic conditions affecting the upper respiratory tract (e.g. chronic sinusitis) which in the opinion of the investigator may interfere with the study evaluation or optimal participation in the study.

  • Patients with a history of chronic lung diseases other than asthma, including (but not limited to) COPD, sarcoidosis, interstitial lung disease, cystic fibrosis, clinically significant bronchiectasis and active tuberculosis.

  • Patients with Type I diabetes or uncontrolled Type II diabetes.

  • Patients who, either in the judgement of the investigator or the responsible Novartis personnel, have a clinically significant condition such as (but not limited to) unstable ischaemic heart disease, NYHA Class III/IV left ventricular failure arrhythmia, uncontrolled hypertension, cerebrovascular disease, psychiatric disease, neurodegenerative diseases, or other neurological disease, uncontrolled hypo‐ and hyperthyroidism and other autoimmune diseases, hypokalemia, hyperadrenergic state, or ophthalmologic disorder or patients with a medical condition that might compromise patient safety or compliance, interfere with evaluation, or preclude completion of the study.

  • Patients with paroxysmal (e.g., intermittent) atrial fibrillation are excluded. Patients with persistent atrial fibrillation as defined by continuous atrial fibrillation for at least 6 months and controlled with a rate control strategy (i.e., selective beta blockers, calcium channel blocker, pacemaker placement, digoxin or ablation therapy) for at least 6 months may be considered for inclusion. In such patients, atrial fibrillation must be present at the run‐in visit (Visit 101) with a resting ventricular rate < 100/min. At Visit 101 the atrial fibrillation must be confirmed by central reading.

  • Patients with a history of myocardial infarction (this should be confirmed clinically by the investigator) within the previous 12 months.

  • Concomitant use of agents known to prolong the QT interval unless it can be permanently discontinued for the duration of study

  • Patients with a history of long QT syndrome or whose QTc measured at Visit 101 (Fridericia method) is prolonged (> 450 msec for males and > 460 msec for females) and confirmed by a central assessor (these patients should not be re‐screened).

  • Patients with a history of hypersensitivity to lactose, any of the study drugs or to similar drugs within the class including untoward reactions to sympathomimetic amines or inhaled medication or any component thereof.

  • Patients who have not achieved an acceptable spirometry result at Visit 101 in accordance with ATS/ERS criteria for acceptability and repeatability. A one‐time repeat spirometry is allowed in an ad‐hoc visit scheduled as close as possible from the first attempt (but not on the same day) if the spirometry did not qualify due to ATS/ERS criteria at Visit 101 and/or Visit 102. If the patient fails the repeat assessment, the patient may be re‐screened once, provided the patient returns to the required treatment as per inclusion criteria 4.

  • Patients unable to use the Concept1 dry powder inhaler, Accuhaler or a metered dose inhaler. Spacer devices are not permitted.

  • History of alcohol or other substance abuse.

  • Patients with a known history of non‐compliance to medication or who were unable or unwilling to complete a patient diary or who are unable or unwilling to use Electronic Peak Flow with e‐diary device.

  • Patients who do not maintain regular day/night, waking/sleeping cycles (e.g., night shift workers).

Interventions MD‐ICS/LABA: MF/IND 160/150 µg daily
HD‐ICS/LABA: MF/IND 320/150 µg daily, FP/SAL 500/50 µg twice daily
LD TRIPLE: MF/GLY/IND 80/50/150 µg daily
MD TRIPLE: MF/GLY/IND 160/50/150 µg daily
Outcomes Moderate to severe exacerbations
Severe exacerbations
All‐cause serious adverse events
All‐cause adverse events
Asthma‐related serious adverse events
Dropouts due to adverse event
ACQ responder at 6 months
ACQ responder at 12 months
CFB in ACQ at 6 months
CFB in ACQ at 12 months
CFB in AQLQ at 12 months
Notes NCT02571777

Lee 2020.

Study characteristics
Methods DESIGN: randomised controlled trial
GROUP: parallel group
DURATION OF THE STUDY: 24‐52 weeks
SPONSORSHIP SOURCE: GlaxoSmithKline
COUNTRY: Argentina, Australia, Canada, Germany, Italy, Japan, Korea, Republic of,the  Netherlands, Poland, Romania, Russian Federation, South Africa, Spain, UK, USA
Participants BASELINE CHARACTERISTICS:
No. of patients included in this review: 1627
Mean age: 53.5
Male %: 38
White %: 80
Current and Ex smoker excluded: Yes. > 10 PYs for ex‐smokers
Baseline FEV1 (L) pre‐bronchodilator: 1.73
Baseline FEV1 % predicted:58.7
Hx of asthma exacerbation: Not required (37% did not have a hx of exacerbation)
Inclusion Criteria
  • Inadequately controlled asthma: participants with inadequately controlled asthma (ACQ‐6 score >:1.5) at Visit 2.

  • Percent‐predicted FEV1: a best pre‐bronchodilator morning (AM) FEV1 > 30% and < 90% of the predicted normal value at Visit 2. Predicted values will be based upon the ERS Global Lung Function Initiative

  • Liver function tests at Visit 1: ALT < 2 x ULN; alkaline phosphatase < 1.5xULN; bilirubin <:1.5xULN (isolated bilirubin >1.5xULN is acceptable if bilirubin is fractionated and direct bilirubin < 35%)

  • Compliance with completion of the Daily eDiary reporting defined as completion of all questions/assessments on >:4 of the last 7 days during the run‐in period.


Exclusion Criteria
  • Respiratory Infection: occurrence of a culture‐documented or suspected bacterial or viral infection of the upper or lower respiratory tract, sinus or middle ear during the run‐in period that led to a change in asthma management or, in the opinion of the Investigator, is expected to affect the subject's asthma status or the participant's ability to participate in the study.

  • Severe asthma exacerbation: evidence of a severe exacerbation during screening or the run‐in period, defined as deterioration of asthma requiring the use of systemic corticosteroids (tablets, suspension, or injection) for at least 3 days or an in‐patient hospitalisation or emergency department visit due to asthma that required systemic corticosteroids.

  • Asthma medication: changes in asthma medication (excluding run‐in medication and albuterol/salbutamol inhalation aerosol provided at Visit 1).

  • Laboratory test abnormalities: evidence of clinically significant abnormal laboratory tests during screening or run‐in which are still abnormal upon repeat analysis and are not believed to be due to disease(s) present. Each Investigator will use his/her own discretion in determining the clinical significance of the abnormality

Interventions MD‐ICS/LABA: FF/VI 100/25 µg daily
HD‐ICS/LABA: FF/VI 200/25 µg daily
MD TRIPLE: FF/UMEC/VI 100/62.5/25 µg daily
HD TRIPLE: FF/UMEC/VI 200/62.5/25 µg daily
Outcomes Moderate to severe exacerbations
Severe exacerbations
All‐cause serious adverse events
All‐cause adverse events
Asthma‐related serious adverse events
Dropouts due to adverse event
ACQ responder at 6 months
CFB in ACQ at 3 months
CFB in ACQ at 6 months
CFB in ACQ at 12 months
Notes NCT02924688
Clinical Study Report available at https://www.gsk‐studyregister.com/en/trial‐details/?id=205715

Mansfield 2017.

Study characteristics
Methods DESIGN: multicentre randomised controlled trial
GROUP: parallel group
DURATION OF THE STUDY: 26 weeks
SPONSORSHIP SOURCE: Teva Branded Pharmaceutical
COUNTRY:USA
Participants BASELINE CHARACTERISTICS:
No. of patients included in this review: 218
Mean age: 46.0
Male %: 47
White %: 72
Current and Ex smoker excluded: yes. > 10 PYs for ex‐smokers
Baseline FEV1 (L) pre‐bronchodilator: 2.37
Baseline FEV1 % predicted: not reported.
Hx of asthma exacerbation: not required.
Inclusion Criteria:
  1. Best pre‐bronchodilator FEV1 of greater than 40% of their predicted normal value.

  2. Patients must have a treatment regimen that includes a SABA (albuterol) for use as needed and either an ICS) or an ICS/LABA as a preventative treatment for a minimum of 8 weeks before the SV. Patients currently taking low‐dose ICS without LABA are not eligible for this study. Patients currently taking low‐dose ICS/LABA may only be entered into the mid ICS strength. All patients must have been maintained on a stable dose of ICS or ICS/LABA for 4 weeks prior to the SV (or pre‐SV if necessary) at 1 qualifying doses

  3. To meet reversibility of disease criteria, the patient must demonstrate a ≥12% reversibility of FEV1 (and 200 mL for patients aged 18 years and older) within 30 minutes following 4 inhalations of albuterol at the SV. Historic reversibility within the past 12 months of the SV may be used to meet this criterion.

  4. Written informed consent/assent is obtained. For adult patients (aged 18 years and older, or as applicable per local regulations), the written informed consent form must be signed and dated by the patient before conducting any study‐related procedure. For minor patients (aged 12 to 17 years, or as applicable per local regulations), the written ICF must be signed and dated by the parent/legal guardian and the written assent form must be signed and dated by the patient (if applicable) before conducting any study‐related procedure. Note: age requirements are as specified by local regulations.

  5. Outpatient ≥ 12 years of age on the date of consent/assent.

  6. Asthma diagnosis: The patient has a diagnosis of asthma as defined by the NIH. The asthma diagnosis has been present for a minimum of 3 months and has been stable (defined as no exacerbations and no changes in medication) for at least 30 days before providing informed consent.

  7. The patient is able to perform acceptable and repeatable spirometry.

  8. The patient is able to perform PEF with a handheld peak flow meter.

  9. The patient is able to use a MDI device without a spacer device and a MDPI device.

  10. The patient is able to withhold (as judged by the investigator) his or her regimen of ICS or study drug, and rescue medication for at least 6 hours before the SV and before all treatment visits where spirometry is performed.

  11. The patient/parent/legal guardian/caregiver is capable of understanding the requirements, risks, and benefits of study participation, and, as judged by the investigator, capable of giving informed consent/assent and being compliant with all study requirements.

  12. SABAs: All patients must be able to replace their current SABA with albuterol/salbutamol HFA inhalation aerosol at the SV for use as needed for the duration of the study.

  13. Female patients may not be pregnant, breastfeeding, or attempting to become pregnant.‐Other criteria may apply, please contact the investigator for more information


Exclusion Criteria:
  1. The patient has a history of a life‐threatening asthma exacerbation that is defined for this protocol as an asthma episode that required intubation and/or was associated with hypercapnia, respiratory arrest, or hypoxic seizures.

  2. The patient is pregnant or lactating, or plans to become pregnant during the study period or for 30 days after the study.

  3. The patient has participated as a randomised patient in any investigational drug study within the 30 days preceding the SV (or prescreening visit, as applicable) or plans to participate in another investigational drug study at any time during this study.

  4. The patient has previously participated in an Fp MDPI or FS MDPI study.

  5. The patient has a known hypersensitivity to any corticosteroid, salmeterol, or any of the excipients in the study drug or rescue medication formulation (i.e., lactose).

  6. The patient has been treated with any known strong cytochrome P450 (CYP) 3A4 inhibitors (eg, azole antifungals, ritonavir, or clarithromycin) within 30 days before the SV or plans to be treated with any strong CYP3A4 inhibitor during the study.

  7. The patient has been treated with any of the prohibited medications during the prescribed (per protocol) washout periods before the SV.

  8. The patient currently smokes or has a smoking history of 10 pack‐years or more (a pack‐year is defined as smoking 1 pack of cigarettes/day for 1 year). The patient may not have used tobacco products within the past year (eg, cigarettes, cigars, chewing tobacco, or pipe tobacco).

  9. The patient has a culture‐documented or suspected bacterial or viral infection of the upper or lower respiratory tract, sinus, or middle ear that has not resolved at least 2 weeks before the SV.

  10. The patient has a history of alcohol or drug abuse within 2 years preceding the SV.

  11. The patient has had an asthma exacerbation requiring systemic corticosteroids within 30 days before the SV, or has had any hospitalisation for asthma within 2 months before the SV.

  12. Initiation or dose escalation of immunotherapy (administered by any route) is planned during the study period. However, patients who initiated immunotherapy 90 days or more before the SV and have been on a stable (maintenance) dose for 30 days or more before the SV may be considered for inclusion.

  13. The patient has used immunosuppressive medications within 4 weeks before the SV.

  14. The patient is unable to tolerate or unwilling to comply with the appropriate washout periods and withholding of all applicable medications. (Patients that require continuous treatment with β‐blockers, monoamine oxidase inhibitors, tricyclic antidepressants, anticholinergics, and/or systemic corticosteroids are excluded).

  15. The patient has untreated oral candidiasis at the SV. Patients with clinical visual evidence of oral candidiasis who agree to receive treatment and comply with appropriate medical monitoring may enter the study.

  16. The patient has a history of a positive test for human immunodeficiency virus, active hepatitis B virus, or hepatitis C infection.

  17. The patient is either an employee or an immediate relative of an employee of the clinical investigational centre.

  18. A member of the patient's household is participating in the study at the same time. However, after the enroled patient completes or discontinues participation in the study, another patient from the same household may be screened.

  19. The patient has a disease/condition that in the medical judgement of the investigator would put the safety of the patient at risk through participation or that could affect the efficacy or safety analysis if the disease/condition worsened during the study.Other criteria may apply, please contact the investigator for more information

Interventions MD‐ICS/LABA: FP/SAL 250/50 µg twice daily, FP/SAL 200/12.5 µg twice daily
HD‐ICS/LABA: FP/SAL 500/50 µg twice daily
Outcomes Moderate to severe exacerbations
Severe exacerbations
All‐cause serious adverse events
All‐cause adverse events
Asthma‐related serious adverse events
Dropouts due to adverse event
Notes NCT02175771

Papi 2007.

Study characteristics
Methods DESIGN: randomised controlled trial
GROUP: Parallel group
DURATION OF THE STUDY: 12 weeks
SPONSORSHIP SOURCE: Chiesi Farmaceutici
COUNTRY: Poland, Ukraine
Participants BASELINE CHARACTERISTICS:
No. of patients included in this review: 228
Mean age: 48.5
Male %: 44
White %: not reported
Current and Ex smoker excluded: yes. > 10 PYs for ex‐smokers
Baseline FEV1 (L) pre‐bronchodilator: 2.03
Baseline FEV1 % predicted: 67.3
Hx of asthma exacerbation: not required.
Inclusion Criteria:
  • Clinical diagnosis of moderate to severe persistent asthma for at least 6 months, according to GINA revised version 2002 guidelines (11):FEV1 or PEFR ³ 50% and £ 80% of the predicted normal; Asthma not adequately controlled with the current therapies, defined as presence of daily asthma symptoms > once a week and night‐time asthma symptoms > twice a month, and daily use of SABA. These findings are to be based on recent medical history and are to be confirmed in the 2‐week run‐in period.

  • Treatment with inhaled corticosteroids at a daily dose ≤ 1000 μg of BDP or equivalent. The daily dose of inhaled corticosteroids taken at visit 1 will be assessed taking into account the following ratios between the doses of the different steroids: fluticasone propionate : BDP CFC : 1 : 2; budesonide : BDP CFC : 4 : 5; flunisolide : BDP CFC : 1 : 1. The ratios between inhaled steroids are irrespective of the formulations (i.e. spray aerosol or powder) used. When BDP is given in the new extra‐fine HFA‐134a formulation (as QVAR®, 3M Healthcare), the ratio with BDP CFC is set as 2: 5. Therefore, the maximum allowed daily dose of inhaled corticosteroids at study entry will be: budesonide 800 μg, fluticasone propionate 500 μg, flunisolide 1000 μg, BDP 1000 mg, BDP HFA extra‐fine 400 μg.

  • Positive response to the reversibility test in the screening visit, defined as an increase of at least 12% (or, alternatively, of 200mL) from baseline value in the measurement of FEV1 30 minutes following 2 puffs (2 ´ 100 µg) of inhaled salbutamol administered via pMDI. The reversibility test can be avoided in patients having a documented positive response in the previous 6 months.

  • A co‐operative attitude and ability to be trained to correctly use the metered dose inhalers and to complete the diary cards.

  • Written informed consent obtained.

  • At the end of the 2‐week run‐in period, the presence of daily asthma symptoms (of at least mild intensity) and nighttime asthma symptom (of at least mild intensity) > once a week, as well as of daily use of relief salbutamol is to be confirmed by reviewing the diary cards for run‐in.


Exclusion Criteria:
  • Inability to carry out pulmonary function testing;

  • Diagnosis of COPD as defined by the NHLBI/WHO GOLD guidelines (30);

  • History of near fatal asthma;

  • Evidence of severe asthma exacerbation or symptomatic infection of the airways in the previous 8 weeks;

  • Three or more courses of oral corticosteroids or hospitalisation due to asthma during the previous 6 months;

  • Patients treated with long‐acting β2‐agonists, anticholinergics and antihistamines during the previous 2 weeks, with topical or intranasal corticosteroids and leukotriene antagonists during the previous 4 weeks;

  • Patients who have changed their dose of inhaled corticosteroids during the previous 4 weeks, or treatment with inhaled corticosteroids at a daily dose > 1000 μg of BDP or equivalent (except for extra‐fine formulations, see inclusion criteria);

  • Current smokers or recent (less than one year) ex‐smokers, defined as smoking at least 10 cigarettes/day;

  • History or current evidence of heart failure, coronary artery disease, myocardial infarction, severe hypertension, cardiac arrhythmias;

  • Diabetes mellitus;

  • PTCA or CABG during the previous six months;

  • Patients with an abnormal QTc interval value in the ECG test, defined as > 450 msec in males or > 470 msec in females;

  • Other haemodynamic relevant rhythm disturbances (including atrial flutter or atrial fibrillation with ventricular response, bradycardia (≤ 55 bpm), evidence of atrial‐ventricular (AV) block on ECG of more than 1st degree;

  • Clinically significant or unstable concurrent diseases: uncontrolled hyperthyroidism, significant hepatic impairment, poorly controlled pulmonary (tuberculosis, active mycotic infection of the lung), gastrointestinal (e.g. active peptic ulcer), neurological or haematological autoimmune diseases;

  • Cancer or any chronic diseases with prognosis < 2 years;

  • Pregnant or lactating females or females at risk of pregnancy, i.e. those not demonstrating adequate contraception (i.e. barrier methods, intrauterine devices, hormonal treatment or sterilization). A pregnancy test is to be carried out in women of a fertile age.

  • History of alcohol or drug abuse;

  • Patients treated with monoamine oxidase inhibitors, tricyclic antidepressants or beta‐blockers as regular use;

  • Allergy, sensitivity or intolerance to study drugs and/or study drug formulation ingredients;

  • Patients unlikely to comply with the protocol or unable to understand the nature, scope and possible consequences of the study;

  • Patients who received any investigational new drug within the last 12 weeks;

  • Patients who have been previously enroled in this study;

  • At the end of the run‐in period, patients will not be admitted to the treatment period in the case of an increase of PEFR (L/sec) measured at the clinics at the end of the run‐in period ³ 15% in respect of values measured at the start of the run‐in period;

  • Patients with asthma exacerbations during the run‐in period will also be excluded from the study.

Interventions FP/SAL 250/50 µg twice daily
BDP/FM 200/12 µg twice daily
Outcomes Moderate to severe exacerbations
Notes Intragroup comparison of MD‐ICS/LABAs. NMA only. NCT00394368

Peters 2008.

Study characteristics
Methods DESIGN: multicentre randomised controlled trial
GROUP: parallel group
DURATION OF THE STUDY: 52 weeks
SPONSORSHIP SOURCE: AstraZeneca
COUNTRY: USA
Participants BASELINE CHARACTERISTICS:
No. of patients included in this review: 575
Mean age: 40.4
Male %: 38
White %: 87
Current and Ex smoker excluded: yes. > 10 PYs for ex‐smokers
Baseline FEV1 (L) pre‐bronchodilator: 2.4
Baseline FEV1 % predicted: 74.2
Hx of asthma exacerbation: not required
Inclusion Criteria:
  • Diagnosis of asthma and baseline lung function tests, symptoms and medication use as determined by the protocol

  • Required and received treatment with inhaled corticosteroids within the timeframe and doses specified in the protocol


Exclusion Criteria:
  • Has required treatment with non‐inhaled corticosteroids within previous 30 days, has sensitivity to drugs specified in the protocol or requires treatment with a beta‐blocker.

  • Has had cancer within previous 5 years or has a condition that may put the patient at risk in this study.

Interventions MD‐ICS/LABA: BUD/FM 320/9 µg twice daily
HD‐ICS/LABA: BUD/FM 640/18 µg twice daily
Outcomes Moderate to severe exacerbations
Severe exacerbations
All‐cause serious adverse events
Al‐ cause adverse events
Dropouts due to adverse event
Notes NCT00651768
Clinical Study Report available at https://astrazenecagrouptrials.pharmacm.com/ST/Submission/View?id=964

Stempel 2016.

Study characteristics
Methods DESIGN: randomised controlled trial
GROUP: parallel group
DURATION OF THE STUDY: 26 weeks
SPONSORSHIP SOURCE: GlaxoSmithKline
COUNTRY: Argentina, Australia, Austria, Belgium, Bulgaria, Canada, Chile, Colombia, Croatia, Czechia, Denmark, Germany, Hungary, Indonesia, Italy, Korea, Republic of, Latvia, Lithuania, Malaysia, Mexico, Peru, Philippines, Poland, Romania, Russian Federation, Serbia, Slovakia, South Africa, Spain, Taiwan, Ukraine, UK, USA
Participants BASELINE CHARACTERISTICS:
No. of patients included in this review: 1562
Mean age: 43.4
Male %: 34
White %: 75
Current and Ex smoker excluded: yes. > 10 PYs for ex‐smokers
Baseline FEV1 (L) pre‐bronchodilator: not reported
Baseline FEV1 % predicted: not reported (Baseline PEF to be >:50% to be enroled)
Hx of asthma exacerbation: Required at least one asthma exacerbation that required medical care from a physician, hospitalisation, and systemic corticosteroid treatment in the previous year
Inclusion Criteria:
  • Provided consent to participate in the study

  • Male or female, 12 years of age and older

  • Clinical diagnosis of asthma for at least 1 year prior to the randomisation

  • Clinic PEF of greater than or equal to 50% of predicted normal value

  • Participant must be appropriately using one of the treatments for asthma listed in the protocol

  • Participant t must be able to complete the asthma control questionnaire, daily questions about asthma, and use a DISKUS inhaler

  • Participant  must have history of at least 1 asthma exacerbation including one of the following in the year prior to randomisation:

  • requiring treatment with systemic corticosteroids

  • an asthma‐related hospitalisation


Exclusion Criteria:
  • History of life‐threatening asthma defined for this protocol as asthma episode that required intubation and/or was associated with hypercapnia requiring non‐invasive ventilatory support

  • Concurrent respiratory disease other than asthma

  • Current evidence of, or ever been told by a physician that they have chronic bronchitis, emphysema, or chronic obstructive pulmonary disease.

  • Exercise induced asthma (as the only asthma‐related diagnosis) not requiring daily asthma control medicine

  • Presence of a bacterial or viral respiratory infection that is not resolved at randomisation

  • An asthma exacerbation requiring systemic corticosteroids within 4 weeks of randomisation or more than 4 separate exacerbations in the 12 months preceding randomisation

  • More than 2 hospitalisations for treatment of asthma in the 12 months preceding randomisation

  • Participant must not meet unstable asthma severity criteria as listed in the protocol

  • Potent cytochrome P450 3A4 (CYP3A4) inhibitors within the last 4 weeks (e.g., ritonavir, ketoconazole, triaconazole)

  • Pregnancy, breast‐feeding or planned pregnancy during the study

  • A Child in Care is a child who has been placed under the control or protection of an agency, organisation, institution or entity by the courts, the government or a government body, acting in accordance with powers conferred on them by law or regulation.

Interventions MD‐ICS/LABA: FP/SAL 250/50 µg twice daily
HD‐ICS/LABA: FP/SAL 500/50 µg twice daily
Outcomes Severe exacerbations
All cause serious adverse events
Asthma‐related serious adverse events
Notes NCT01475721

van Zyl‐Smit 2020.

Study characteristics
Methods DESIGN: randomised controlled trial
GROUP: parallel group
DURATION OF THE STUDY: 26‐52 weeks
SPONSORSHIP SOURCE: Novartis
COUNTRY: Bulgaria, China, Croatia, Czechia, Egypt, Estonia, Germany, Guatemala, Hungary, India, Ireland, Japan, Korea, Republic of, Latvia, Lithuania, Mexico, Poland, Romania, Russian Federation, Serbia, Slovakia, South Africa, UK, USA
Participants BASELINE CHARACTERISTICS:
No. of patients included in this review: 1330
Mean age: 47.8
Male %: 42
White %: 70
Current and Ex smoker excluded: yes. > 10 PYs for ex‐smokers
Baseline FEV1 (L) pre‐bronchodilator: 2.10
Baseline FEV1 % predicted:67.1
Hx of asthma exacerbation: not required (69 % of patients had no hx of exacerbations)
Inclusion Criteria:
  • Participants with a diagnosis of asthma, for a period of at least 1 year prior to Visit 1 (Screening)

  • Participants who have used medium or high dose inhaled corticosteroids (ICS) or low dose of long acting beta‐2 agonist (LABA)/ICS combinations for asthma for at least 3 months and at stable doses for at least 1 month prior to Visit 1

  • Participants must have ACQ‐7 score ≥ 1.5 at Visit 101 and at Visit 102 (prior to double‐blind treatment) and qualify for treatment with medium or high dose LABA/ICS

  • Pre‐bronchodilator ≥ 50% Forced expiratory volume in 1 second (FEV1) of < 85 % of the predicted normal value for the participants after withholding bronchodilators at both Visit 101 and 102, according to American Thoracic Society/European Respiratory Society (ATS/ERS) criteria.

  • Withholding period of bronchodilators prior to spirometry: short‐acting beta‐2 agonist (SABA) for ≥ 6 hours and FDC or free combinations of ICS/LABA for ≥ 48 hours, short‐acting anticholinergics (SAMA) for ≥ 8 hours, xanthines >:07 days

  • A one‐time repeat/re‐testing of percent predicted FEV1 (pre‐bronchodilator FEV1) is allowed at Visit 101 and at Visit 102.


Spacer devices are permitted for reversibility testing only.
‐Participants who demonstrate an increase in FEV1 of 12% and 200 mL within 30 minutes after administration of 400 µg salbutamol/360 µg albuterol (or equivalent dose) at Visit 101 All participants must perform a reversibility test at Visit 101
If reversibility is not demonstrated at Visit 101:
  • Reversibility should be repeated once‐

  • Participants may be permitted to enter the study with historical evidence of reversibility that was performed according to ATS/ERS guidelines within 2 years prior to Visit 1

  • Alternatively, participants may be permitted to enter the study with a historical positive bronchoprovocation test that was performed within 2 years prior to Visit 1.


Exclusion Criteria:
  • Participants who have smoked or inhaled tobacco products within the six‐month period prior to Visit 1, or who have a smoking history of greater than 10 pack years. This includes use of nicotine inhalers such as e‐cigarettes at the time of Visit 1

  • Participants who have had an asthma attack/exacerbation requiring systemic steroids or hospitalisation or emergency room visit within 6 weeks of Visit 1 (Screening)

  • Participants who have ever required intubation for a severe asthma attack/exacerbation.

  • Participants who have a clinical condition which is likely to be worsened by ICS administration (e.g. glaucoma, cataract and fragility fractures) who are according to investigator's medical judgement at risk participating in the study.

  • Participants who have had a respiratory tract infection or asthma worsening as determined by the investigator within 4 weeks prior to Visit 1 (Screening) or between Visit 1 and Visit 102. Participants may be re‐screened 4 weeks after recovery from their respiratory tract infection or asthma worsening.

  • Participants with a history of chronic lung diseases other than asthma, including (but not limited to) Chronic Obstructive Pulmonary Disease (COPD), sarcoidosis, interstitial lung disease, cystic fibrosis, clinically significant bronchiectasis and active tuberculosis.

  • Participants with severe narcolepsy and/or insomnia.

  • Participants who have a clinically significant electrocardiogram (ECG) abnormality at Visit 101 (Start of Run‐In epoch) and at any time between Visit 101 and Visit 102 (including unscheduled ECG). ECG evidence of myocardial infarction at Visit 101 (via central reader) should be clinically assessed by the investigator with supportive documentation

  • Participants with a history of hypersensitivity to lactose, any of the study drugs or to similar drugs within the class including untoward reactions to sympathomimetic amines or inhaled medication or any component thereof

  • Participants who have not achieved an acceptable spirometry results at Visit 101 in accordance with ATS/ERS criteria for acceptability and repeatability (prescreening allowed only once).

Interventions MD‐ICS/LABA: MF/IND 160/150 µg daily
HD‐ICS/LABA: MF/IND 320/150 µg qd, FP/SAL 500/50 µg twice daily
Outcomes Moderate to severe exacerbations
Severe exacerbations
All cause serious adverse events
All cause adverse events
Asthma‐related serious adverse events
Dropouts due to adverse event
ACQ responder at 6 months
ACQ responder at 12 months
CFB in ACQ at 3 months
CFB in ACQ at 6 months
CFB in ACQ at 12 months
CFB in AQLQ at 6 months
CFB in AQLQ at 12 months
Notes NCT02554786

Virchow 2019.

Study characteristics
Methods See Virchow 2019a and 2019b
Participants  
Interventions  
Outcomes  
Notes NCT02676076; NCT02676089

Virchow 2019a.

Study characteristics
Methods DESIGN: multicentre randomised controlled trial
GROUP: parallel group
DURATION OF THE STUDY: 26‐52 weeks
SPONSORSHIP SOURCE: Chiesi
COUNTRY: Germany
Participants BASELINE CHARACTERISTICS:
No. of patients included in this review: 1150
Mean age: 53.2
Male %: 39
White %: 100
Current and Ex smoker excluded: yes. > 10 PYs for ex‐smokers
Baseline FEV1 (L) pre‐bronchodilator: 1.7
Baseline FEV1 % predicted: 55.4
Hx of asthma exacerbation: at least 1 documented asthma exacerbation in the previous year.
Inclusion Criteria:
  • History of asthma ≥ 1 year and diagnosed before 40 years old

  • Uncontrolled asthma with double therapy only on medium doses of ICS in combination with LABA with ACQ‐7 ≥1.5

  • Pre‐bronchodilator FEV1 < 80% of the predicted normal value

  • Positive reversibility test

  • At least 1 documented asthma exacerbation in the previous year


Exclusion Criteria:
  • Pregnant or lactating women

  • Diagnosis of COPD

  • Patients with any asthma exacerbation or respiratory tract infection in the 4 weeks prior screening

  • Current or ex‐smokers (≥ 10 packs year)

  • Any change in dose, schedule or formulation of ICS + LABA combination in the 4 weeks prior screening

Interventions MD‐ICS/LABA: BDP/FM 200/12 µg twice daily
MD TRIPLE: BDP/FM/G 200/12/20 µg twice daily
Outcomes All‐cause serious adverse events
All‐cause adverse events
Asthma‐related serious adverse events
Dropouts due to adverse event
ACQ responder at 6 months
ACQ responder at 12 months
Notes NCT02676076

Virchow 2019b.

Study characteristics
Methods DESIGN: randomised controlled trial
GROUP: parallel group
DURATION OF THE STUDY: 26‐52 weeks
SPONSORSHIP SOURCE: Chiesi
COUNTRY: Argentina, Belarus, Bulgaria, Czechia, Germany, Hungary, Italy, Lithuania, Poland, Portugal, Romania, Russian Federation, Slovakia, Spain, Turkey, Ukraine, UK
Participants BASELINE CHARACTERISTICS:
No. of patients included in this review: 1431
Mean age: 53.2
Male %: 39
White %: 100
Current and Ex smoker excluded: yes. > 10 PYs for ex‐smokers
Baseline FEV1 (L) pre‐bronchodilator: 1.6
Baseline FEV1 % predicted: 51.9
Hx of asthma exacerbation: at least 1 documented asthma exacerbation in the previous year.
Inclusion Criteria:
  • History of asthma ≥ 1 year and diagnosed before 40 years old

  • Uncontrolled asthma with double therapy only on high doses of ICS in combination with LABA with ACQ‐7 ≥1.5

  • Pre‐bronchodilator FEV1 < 80% of the predicted normal value

  • Positive reversibility test

  • At least 1 documented asthma exacerbation in the previous year


Exclusion Criteria:
  • Pregnant or lactating women

  • Diagnosis of COPD

  • Patients with any asthma exacerbation or respiratory tract infection in the 4 weeks prior screening

  • Current smoker or ex‐smoker (≥ 10 packs year)

  • Any change in dose, schedule or formulation of ICS + LABA combination in the 4 weeks prior screening

Interventions HD‐ICS/LABA: BDP/FM 400/12 µg twice daily
HD TRIPLE: BDP/FM/GLY 400/12/20 µg twice daily, BDP/FM 400/12 µg twice daily +Tio 5 µg daily
Outcomes All‐cause serious adverse events
All‐cause adverse events
Asthma‐related serious adverse events
Dropouts due to adverse event
ACQ responder at 6 months
ACQ responder at 12 months
Notes NCT02676089

Weinstein 2010.

Study characteristics
Methods DESIGN: randomised controlled trial
GROUP: parallel group
DURATION OF THE STUDY: 12 weeks
SPONSORSHIP SOURCE: Merck Sharp & Dohme
COUNTRY: North America, Latin America, Russia, Ukraine, and Europe
Participants BASELINE CHARACTERISTICS:
No. of patients included in this review: 488
Mean age: 48
Male %: 44
White %: 89
Current and Ex smoker excluded: yes. > 10 PYs for ex‐smokers
Baseline FEV1 (L) pre‐bronchodilator: 2.05
Baseline FEV1 % predicted: 66.2
Hx of asthma exacerbation: at least one severe exacerbation requiring a course of oral glucocorticosteroid 2 to 12 months prior to Screening.
Inclusion Criteria:
  • A participant must be at least 12 years of age, of either sex, and of any race, with a diagnosis of asthma of at least 12 months duration that is consistent with the following definition:The diagnosis of asthma is based upon clinical history and examination, pulmonary function parameters, and response to beta2‐agonists, according to international guidelines.

  • A participant must have been using a high dose of ICS either alone or in combination with a LABA for at least 12 weeks prior to Screening, with no use of OCS within 30 days prior to Screening. A participant must have been on a stable asthma regimen (daily dose unchanged) for at least 2 weeks prior to Screening. High daily doses of ICS are defined as follows: > 1000 µg beclomethasone CFC>500 µg beclomethasone HFA > 1000 µg budesonide dry powder inhaler (DPI)>2000 µg flunisolide> 500 µg fluticasone > 400 µg MF >2000 µg triamcinolone acetonide > 320 µg ciclesonide


Note: Dose delivery by method or modality other than those noted above must be equivalent.
  • A participant must have experienced at least one severe exacerbation requiring a course of oral glucocorticosteroid 2 to 12 months prior to screening.

  • If, based upon the medical judgement of the investigator, there is no inherent harm in changing the participant's current asthma therapy, then the participant (and parent/guardian, if applicable) must be willing to discontinue his/her prescribed ICS or ICS/LABA prior to initiating MF MDI run‐in medication.

  • To document the diagnosis of asthma and assure the participant's responsiveness to bronchodilators before randomisation, one of the following methods can be used at the Screening Visit, Day‐14, or thereafter, but prior to the Baseline Visit:The participant must demonstrate an increase in absolute FEV1 of at least 12% and at least 200 mL within approximately 15 to 20 minutes after administration of four inhalations of albuterol/salbutamol (total dose of 360 to 400 µg). The participant must demonstrate a PEF variability of more than 20% expressed as a percent of the best and lowest morning pre‐bronchodilator PEF over at least 1 week. The participant must demonstrate a diurnal variation in PEF of more than 20% based on the difference between the pre‐bronchodilator (before taking albuterol/salbutamol) morning value and the post‐bronchodilator value (after taking albuterol/salbutamol) from the evening before, expressed as a percentage of the mean daily PEF value. Note: If a participant is to qualify using diurnal variation, the participant should be instructed to perform his/her PEF evaluation after using his/her bronchodilator in the evening.

  • At the Screening Visit, the participant's FEV1 must be ≥ 50% predicted when all restricted medications have been withheld for the appropriate intervals.

  • At the Baseline Visit, the participant's FEV1 must be ≥ 50% and ≤ 85% predicted when all restricted medications have been withheld for the appropriate intervals.

  • The  participant (and parent/guardian for a participant under the age of legal consent) must be willing to give written informed consent and be able to adhere to dose and visit schedules.

  • A female participant of childbearing potential must be using a medically acceptable, adequate form of birth control. This includes:hormonal contraceptive as prescribed by a physician (oral combined, hormonal vaginal ring, hormonal implant or depot‐injectable);medically prescribed IUD; medically prescribed topically‐applied transdermal contraceptive patch;condom in combination with a spermicide (double‐barrier method);monogamous relationship with a male partner who has had a vasectomy. The participant must have started this birth control method at least 3 months prior to Screening (with the exception of condom in combination with spermicide), and must agree to continue its use for the duration of the study. A female participant of childbearing potential who is not currently sexually active must agree and consent to using a medically acceptable method should she become sexually active during the course of this study. Women who have been surgically sterilised or are at least 1 year postmenopausal are not considered to be of childbearing potential. A female participant of childbearing potential must have a negative serum pregnancy test at Screening in order to be considered eligible for the open‐label MF MDI Run‐in period.


Exclusion Criteria:
  • A participant who demonstrates a change (increase or decrease) in absolute FEV1 of >20% at any time from the Screening Visit up to and including the Baseline Visit. Pulmonary function tests (PFTs) will be performed in the morning.

  • A participant who requires the use of >8 inhalations per day of short‐acting beta agonists (SABA) MDI or >:2 nebulised treatments per day of 2.5 mg SABA, on any 2 consecutive days from the Screening Visit up to and including the Baseline Visit.

  • A participant who experiences a decrease in AM or PM peak expiratory flow (PEF) below the run‐in period stability limit on any 2 consecutive days prior to randomisation.

  • A participant who experiences a clinical asthma exacerbation (defined as a deterioration of asthma that results in emergency treatment, hospitalisation due to asthma, or treatment with additional, excluded asthma medication [including oral or other systemic corticosteroids, but allowing SABAs]), at any time from the Screening Visit up to and including the Baseline Visit.

  • A participant who has been treated in the emergency room (for a severe asthma exacerbation), or admitted to the hospital for management of airway obstruction, within the last 3 months.

  • A participant who has ever required ventilator support for respiratory failure secondary to asthma.

  • A participant who has experienced an upper or lower respiratory tract infection (viral or bacterial) within the previous 2 weeks prior to Screening and Baseline Visits. Visits can be rescheduled 2 weeks after complete resolution of the event to re‐assess eligibility.

  • A participant who is a smoker or ex‐smoker and has smoked within the previous year or has had a cumulative smoking history >10 pack‐years.

  • A participant with a clinically significant abnormal vital sign.

  • A participant with evidence (upon visual inspection, laboratory culture is not required) of clinically significant oropharyngeal candidiasis at Baseline (Visit 3) with or without treatment. If there is evidence of oropharyngeal candidiasis at Screening or Pre‐Baseline Visit, the participant may be treated as appropriate and the Baseline Visit can be scheduled upon resolution. If there is evidence of oropharyngeal candidiasis at the Baseline Visit, the participant may be treated as appropriate and the visit can be rescheduled upon resolution.

  • A participant with a history of clinically significant renal, hepatic, cardiovascular, metabolic, neurologic, haematologic, ophthalmologic, respiratory, gastrointestinal, cerebrovascular, or other significant medical illness or disorder which, in the judgement of the investigator, could interfere with the study, or require treatment that might interfere with the study. Specific examples include (but are not limited to) insulin‐dependent diabetes, hypertension being treated with beta blockers, active hepatitis, coronary artery disease, arrhythmia, stroke, severe rheumatoid arthritis, chronic open‐angle glaucoma or posterior subcapsular cataracts, AIDS, or conditions that may interfere with respiratory function such as clinically diagnosed COPD, chronic bronchitis, emphysema, bronchiectasis, cystic fibrosis, etc. Other conditions that are well‐controlled and stable (eg, hypertension not requiring beta blockers) will not prohibit participation if deemed appropriate per the investigator's judgement.

  • A participant who is known to be allergic to or intolerant of ICS, beta2 agonists, or any of the excipients present in the medications used in this study.

  • A female participant who is breast‐feeding, pregnant, or intends to become pregnant while participating in this study.

  • A participant is a known illicit drug user.

  • A participant who is known to be HIV positive (HIV testing will not be conducted in this study).

  • A participant who is unable to correctly use an oral MDI inhaler.

  • A participant who has been taking any of the restricted medications prior to Screening without meeting the required washout time frames.

  • A participant who cannot adhere to the permitted concomitant medications and prohibited medications.

  • A participant participating in this study may not participate in this same study at another investigational site. In addition, a participant cannot participate in a different investigational study at any site, during the same timeframe of this study.

  • A participant must not be randomised into this study more than once.

  • No person directly associated with the administration of the study may participate as a study participant. No family member of the investigational study staff may participate in this study.

  • A participant who previously participated in a trial with MF/F.

  • Participants with a history of significant QTC prolongation (i.e., QTc > 500 msec) are excluded from participation in the study.

Interventions MD‐ICS/LABA: MF/FM 200/10 µg twice daily
HD‐ICS/LABA: MF/FM 400/10 µg twice daily
Outcomes All‐cause serious adverse events
A‐l cause adverse events
Asthma‐related serious adverse events
Dropouts due to adverse event
CFB in ACQ at 3 months
Notes NCT00381485

Woodcock 2013.

Study characteristics
Methods DESIGN: randomised controlled trial
GROUP: parallel group
DURATION OF THE STUDY: 24 weeks
SPONSORSHIP SOURCE: GlaxoSmithKline
COUNTRY: Argentina, Chile, Korea, Republic of, Netherlands, Philippines, USA.
Participants BASELINE CHARACTERISTICS:
No. of patients included in this review: 806
Mean age: 42.9
Male %: 39
White %: 59
Current and Ex smoker excluded: yes. > 10 PYs for ex‐smokers
Baseline FEV1 (L) pre‐bronchodilator: 2.0
Baseline FEV1 % predicted: 68.4
Hx of asthma exacerbation: not required
Inclusion Criteria:
  • Clinical diagnosis of asthma

  • Reversibility of at least 12% and at least 200 mL within 10‐40 minutes following 2‐4 inhalations of albuterol

  • FEV1 of 40%‐85% predicted normal

  • Currently using inhaled corticosteroid therapy


Exclusion Criteria:
  • History of life‐threatening asthma within previous 5 years (requiring intubation and/or was associated with hypercapnia, respiratory arrest or hypoxic seizures)

  • Respiratory infection or oral candidiasis

  • Asthma exacerbation requiring oral corticosteroids or that resulted in overnight hospitalisation requiring additional asthma treatment

  • Uncontrolled disease or clinical abnormality

  • Allergies

  • Taking another investigational medication or prohibited medication

  • Night shift workers

  • Current smokers or subjects with smoking history of at least 10 pack years

Interventions FP/SAL 250/50 µg twice daily
FF/VI 100/25 µg daily
Outcomes Moderate to severe exacerbations
Severe exacerbations
All‐cause serious adverse events
All‐cause adverse events
Asthma‐related serious adverse events
Dropouts due to adverse event
CFB in ACQ at 6 months
CFB in AQLQ at 6 months
Notes Intragroup comparison of MD‐ICS/LABAs. NMA only. NCT01147848
Clinical Study Report available at https://www.gsk‐studyregister.com/en/trial‐details/?id=113091

ACQ: asthma control questionnaire; AIDS: acquired immune deficiency syndrome; ALT: alanine transaminase; ATS: American Thoracic Society; BDP: : beclomethasone dipropionate ;CFC: budesonide propionate ‐ chlorofluorocarbon;BPH: benign prostatic hyperplasia; BUD: budesonide; CABG: coronary artery by‐pass graft;CBC:  CFB: ; CFC: chlorofluorocarbon; COPD: chronic obstructive pulmonary disease; CYP: Cytochromes;DPI: dry powder inhaler; ECG: electrocardiogram;EDTA: ethylenediamine tetra‐acetic acid; ERS: European Respiratory Society; FEV1; forced expiratory volume in one second;FF: fluticasone furoate;FM: ; FP: fluticasone propionate;GINA: Global Initiative for Asthma; HD: high dose;HFA: hydrofluoroalkane; HIV: Human Immunodeficiency Virus; ICF: informed consent form; ICH‐GCP: ;International Conference for Harmonisation Clinical Practice guidelines; ICS: inhaled corticosteroid; IUD: intra‐uterine device; LABA: long‐acting beat2‐agonist; LAMA: long‐acting muscarinic antagonist; LD: low dose; MD: medium dose; MDF: ; MF: ;NIH: National Institute of Health; NHLBI: National Heart Lung and Blood Institute; NMA: network meta‐analysis; NYHA: New York Heart Association;S: OCS: oral corticosteroid; PEF: peak expiratory flow; PEFR: peak expiratory flow rate; pMDI: pressurised metered dose inhaler; PTCA: Percutaneous transluminal coronary angioplasty;PY: Pack year;QT: s a measurement made on an electrocardiogram;SABA: short‐acting beta2‐agonist;SALM: salmeterol; Tio: tiotropium; TNF: Tumour necrosis factor; ULN: upper limit of normal; UMEC: umeclidinium; VI: vilanterol; WHO: World Health Organization.

Characteristics of excluded studies [ordered by study ID]

Study Reason for exclusion
Akpinarli 1999 Six‐week paediatric trial
Allbers 2010 Not pre‐registered.
Antilla 2014 Clinically stable for at least 1 month with ACQ‐7 score ≤ 3
Aubier 1999 Not pre‐registered.
Bailey 2008 No qualifying comparisons
Balki 2018 No qualifying comparisons
Barnes 2013 Stable asymptomatic patients
Bateman 2011 No breakdown on ICS dose. B16‐Arg/Arg patients
Bateman 2014 No qualifying comparisons
Beasley 2015 No qualifying comparisons
Bernstein 2018 Patients had to be symptom free
Blais 2016 168 hour trial
Blais 2017 Cross‐over design
Bleecker 2012 No qualifying comparisons
Bodzenta‐Lukaszyk 2011 No qualifying comparisons
Boyd 1995 No qualifying comparisons
Buhl 2003 No qualifying comparisons
Busse 2013 Safety trial. Not clear if patients were symptomatic before study entry. Seventy per cent of patients did not have a history of exacerbation within 12 months prior to study entry.
Dahl 2006 Not pre‐registered.
Devillier 2018 No qualifying treatment comparisons.
D’Urzo 2001 No qualifying treatment comparisons.
EUCTR2008‐004833‐70 BUDESONIDE‐SALMETEROL DPI is not approved nor commercially available
Fitzgerald 1999 Inclusion criteria for age was not described
Gardiner 1994 Eight‐week trial
Godard 2008 No qualifying treatment comparisons.
Green 2006 Six‐week trial
Hamelmann 2016 No qualifying treatment comparisons.
Hamelmann 2017 Significant proportion of patients received low‐dose ICS
Hoshino 2016 Not pre‐registered.
Houghton 2007 Four‐week trial
Hultquist 2000 Four‐week trial
Ind 2003 Not pre‐registered.
Ishiura 2018 No qualifying comparisons. eight‐week trial
Katial 2011 No qualifying comparisons
Kerstjens 2015 ICS/LAMA study. No qualifying treatment comparisons.
Kerwin 2009 No qualifying comparisons
Kerwin 2011 No qualifying comparisons
Kerwin 2021 ICS dose was not described. Glycopyrronium has not been approved or commercially available.
Koenig 2008 Low dose ICS included and no breakdown.
Kuna 2007 Not pre‐registered.
Kupczyk 2021 Not clear if the new formulation HFA qualifies as medium‐ or high‐dose ICS/LABA.
Langton Hewer 1995 Eight‐week trial
Lee 2015 Fourteen‐day trial
Lenney 2013 Low‐dose ICS
Li 2010 Paediatric trial
Lin 2015 No qualifying treatment comparisons.
Lotvall 2014 No qualifying treatment comparisons.
Malone 2005 Paediatric trial
Maspero 2010 Wrong study design. Baseline characteristics were different between MD and HD‐ICS combos.
Maspero 2014 Wrong patient population
Meijer 1995 Paediatric trial
Morice 2008 Paediatric trial
Muraki 2013 Not randomised
NCT00118690 Four‐week trial
NCT00118716 Four‐week trial
NCT01192178 Paediatric trial
NCT01570478 ACT 20‐25. Not symptomatic at entry
NCT02127697 Withdrawn
NCT02296411 Cross‐over design
NCT02433834 Cross‐over design
NCT02892344 No qualifying treatment comparisons. LD‐ICS vs LD‐ICS/LABA
NCT03063086 Three‐week trial
NCT03184987 Non‐randomised controlled study
NCT03376932 Trial withdrawn
Norhaya 1999 Four‐week trial
O'Byrne 2014 No qualifying treatment comparisons.
O'Byrne 2016 Non‐randomised controlled study
Ohta 2015 Only 54% to 61% of patients received LABA. No breakdown on with and without LABA.
Paggiaro 2016 ICS/LAMA study. No qualifying treatment comparisons.
Peters 2010 No qualifying treatment comparisons.
Peters 2016 No qualifying treatment comparisons
Ploszczuk 2018 Paediatric trial
Pohunek 2006 Paediatric trial
Price 2002 Cost‐effectiveness analysis
Rajanandh 2014 No qualifying data
Raphael 2017 No qualifying treatment comparisons. Low dose‐ICS/LABA vs medium dose‐ICS/LABA
Reddel 2007 Eight‐week trial
Renzi 2010 No qualifying treatment comparisons. Low dose‐ICS/LABA vs medium dose‐ICS/LABA. Not pre‐registered.
Russell 1995 Paediatric trial
Sher 2017 No qualifying comparisons
Simons 1997 Four‐week trial
Stelmach 2008 Eight‐week trial
Stempel 2016x Paediatric trial
Svedsater 2018 No qualifying comparisons
Tal 2002 Paediatric trial
Teper 2005 Paediatric trial
Verberne 1998 Paediatric trial
Watz 2019 Three‐week study
Wechsler 2016 No qualifying treatment comparisons. Eighty‐seven per cent of the population received low‐dose ICS.
Weiler 2005 Four‐week trial
Weinstein 2019 Patients had to be stable enough to be able to stepdown to mometasone monotherapy.
Yang 2015 Fourteen‐day trial
Zhang 2018 Not pre‐registered. Eight‐week study
Zimmerman 2004 Paediatric trial

ACT 20‐25; HD: ICS: inhaled corticostroids; LABA: ; : long‐acting bronchodilator inhaler; LAMA: long‐acting muscarinic antagonists; LD: ; MD;

Characteristics of ongoing studies [ordered by study ID]

NCT03387241.

Study name Efficacy of FLUTIFORM ® vs Seretide® in moderate to severe persistent asthma in subjects aged ≥12 years
Methods A double‐blind, double‐dummy, randomised, multicentre, two‐arm parallel group study to assess the efficacy and safety of FLUTIFORM® pMDI (2 puffs twice daily) vs Seretide® pMDI (2 puffs twice daily)
Participants in participants aged ≥12 years with moderate to severe persistent, reversible asthma
Interventions FLUTIFORM® pMDI (Fluticasone/ Formoterol Low dose: 50/5 µg Mid dose: 125/5 µg High dose 250/10 µg 2 puffs twice daily) vs Seretide® pMDI (fluticasone/ salmeterol Low dose: 50/25 µg Mid dose: 125/25 µg High dose 250/25 µg 2 puffstwice aily)
Outcomes Change from the pre‐doseFEV1 at baseline to 2 hours post‐dose FEV1 at Week 12
Starting date June 2, 2017
Contact information Ling Li 8610 65636891 ling.li@mundipharma.com.cn
Notes Mundipharma (China) Pharmaceutical Co. Ltd

NCT04191434.

Study name Efficacy andsSafety of flamboyant 125/12 association in the treatment of adults with moderate asthma
Methods Multicentre, randomized, double‐blind, double‐dummy, National, Phase III Clinical Trial
Participants Adults with masthma
Interventions Flamboyant 125/12 2 puffs twice dailyvs Budesonide/formoterol 200/6 2 puffs twice daily
Outcomes Change from baseline in Forced expiratory volume in 1 second (FEV1), obtained through espirometry. [ Time Frame: 12 weeks ] Incidence and severity of adverse events recorded during the study. [ Time Frame: 14 weeks ]
Starting date September 2021
Contact information Monalisa FB Oliveira, MD +551938879851 pesquisa.clinica@ncfarma.com.br
Notes EMS

NCT04191447.

Study name Efficacy and safety of Flamboyant 200/12 association in the treatment of adults With severe asthma
Methods Multicente, randomised, double‐blind, double‐dummy, National, Phase III Clinical Trial
Participants Adults with severe asthma
Interventions Flamboyant 200/12 2 puffs twice daily vs Budesonide / Formoterol 400/12 2 puffs twice daily
Outcomes Change from baseline in Forced expiratory volume in 1 second (FEV1), obtained through espirometry. [ Time Frame: 12 weeks ] Incidence and severity of adverse events recorded during the study. [ Time Frame: 14 weeks ]
Starting date September 2021
Contact information Monalisa FB Oliveira, MD +551938879851 pesquisa.clinica@ncfarma.com.br
Notes EMS

NCT04609878.

Study name Study to Assess PT010 in adult and adolescent participants with inadequately controlled asthma (KALOS) (KALOS)
Methods A Randomised, double‐blind, double dummy, parallel group, multicenrer variable length study
Participants Adult and adolescent participants With inadequately controlled asthma
Interventions Budesonide, glycopyrronium, and formoterol fumarate metered dose inhaler (BGF MDI) 320/28.8/9.6 μg; BGF MDI 320/14.4/9.6 μg; Budesonide and formoterol fumarate metered dose inhaler (BFF MDI) 320/9.6 μg; BFF pMDI 320/9 μg
Outcomes Change from baseline in forced expiratory volume in 1 second (FEV1) area under the curve 0 to 3 hours (AUC0‐3) at Week 24 [ Time Frame: 24 Weeks ]
Primary end point(s) of Pooled Studies D5982C00007 and D5982C00008: Rate of severe asthma exacerbations
Starting date December 15, 2020
Contact information AstraZeneca Clinical Study Information Center 1‐877‐240‐9479 information.center@astrazeneca.com
Notes Estimated Study Completion Date:July 25, 2023

NCT04609904.

Study name Study to assess PT010 in adult and adolescent participants with inadequately controlled asthma (LOGOS) (LOGOS)
Methods A randomised, double‐blind, double dummy, parallel group, multicenter 24 to 52 week variable length study to assess the efficacy and safety of budesonide, glycopyrronium, and formoterol fumarate metered dose inhaler (MDI) relative to budesonide and formoterol fumarate MDI and Symbicort® pressurised MDI
Participants Adult and adolescent participants with inadequately controlled asthma. Approximately 2800 participants will be randomised globally.
Interventions Budesonide, glycopyrronium, and formoterol fumarate metered dose inhaler (BGF MDI) 320/28.8/9.6 μg; BGF MDI 320/14.4/9.6 μg; Budesonide and formoterol fumarate metered dose inhaler (BFF MDI) 320/9.6 μg; BFF pMDI 320/9 μg
Outcomes Change from baseline in forced expiratory volume in 1 second (FEV1) area under the curve 0 to 3 hours (AUC0‐3) at Week 24; Rate of severe asthma exacerbations.
Starting date March 1, 2021
Contact information AstraZeneca Clinical Study Information Center 1‐877‐240‐9479 information.center@astrazeneca.com
Notes Estimated Study Completion Date: September 22, 2023

NCT04937387.

Study name Efficacy and safety of Fluticasone Furoate/Umeclidinium/Vilanterol (FF/UMEC/VI) in Chinese participants with inadequately controlled asthma
Methods A Phase III, 12‐week, randomised, double‐blind, 4‐arm parallel Ggroup bridgins Study
Participants Chinese participants with inadequately controlled asthma
Interventions FF/UMEC/VI vs. FF/VI
Outcomes FEV1, Change from baseline in Asthma Control Questionnaire (7 items) (ACQ‐7)
Starting date June 24, 2021
Contact information US GSK Clinical Trials Call Center 877‐379‐3718GSKClinicalSupportHD@gsk.com
Notes Last Update Posted: November 16, 2021

NCT05018598.

Study name Step‐up to medium strength triple therapy vs High strength ICS/LABA in adult asthmatics uncontrolled on medium strength ICS/LABA (MiSTIC)
Methods A 26‐week, randomised, double‐blind, multinational, multicentre, active controlled, 2‐arm parallel group trial
Participants Participants with asthma uncontrolled on medium doses of Inhaled Corticosteroids in combination with long‐Acting β2‐Agonists
Interventions CHF 5993 100/6/12.5 μg pMDI (Fixed Combination of Extrafine Formulation of Beclometasone Dipropionate Plus Formoterol Fumarate Plus Glycopyrronium Bromide) to CHF 1535 22/6 μg pMDI (Fixed Combination of Extrafine Formulation of Beclometasone Dipropionate Plus Formoterol Fumarate)
Outcomes Proportion of participants exhibiting no Airflow Obstruction on average over 26 weeks of treatment in the study sub‐population with Airflow Obstruction status at screening
Change from baseline in pre‐dose FEV1 at Week 26
Starting date August 24, 2021
Contact information Chiesi Farmaceutici S.p.A. Chiesi Clinical Trial Info +39 0521 2791 clinicaltrials_info@chiesi.com
Notes Last Update Posted: August 24, 2021

FEV1:

pMID:

Differences between protocol and review

  • We conducted subgroup analyses for exacerbation outcomes separating studies requiring or not requiring a history of asthma exacerbation in the previous year to assess intransitivity in the NMAs.

  • We did not perform a subgroup analysis on publication status as it was homogenous across the included studies.

  • We used the GeMTC package in R as well as OpenBUGS for the NMAs

  • We used a normal prior (0,0.01) for relative treatment effects in some outcomes in the NMAs in order to make the models more stable.

  • We used informative, empirically derived prior distributions for the between‐study heterogeneity parameter for the adverse event outcomes NMAs (Turner 2015) and semi‐informative half‐normal prior distributions for the between‐study heterogeneity parameter in severe exacerbations NMAs (Röver 2021).

  • We used the node‐splitting model (van Valkenhoef 2016) to assess inconsistency between direct and indirect estimates instead of an inconsistency model (Dias 2013bDias 2013c) in the NMAs. This is a more sensitive method to detect inconsistency.

Contributions of authors

Y. Oba: extracted data, assessed studies for methodological quality, constructed figures and tables for pairwise meta‐analyses and otherwise constructed the review.

T Maduke: extracted data and assessed studies for methodological quality.

S Anwer: conducted the network meta‐analyses, constructed tables and figures, and drafted the network meta‐analysis results.

T Patel: extracted data and assessed studies for methodological quality.

S Dias: provided guidance and supervision of the network meta‐analyses and their presentation and interpretation and drafted the network meta‐analysis results.

All review authors contributed to the writing of the review and approved the final version of the document.

Contributions of editorial team

Sally Spencer (Coordinating Editor) edited the review; advised on methodology, interpretation and content; approved the review prior to publication.

Rebecca Fortescue (Coordinating Editor): Checked data entry prior to write‐up of full review.

Milo Puhan (Contact Editor): edited the review; advised on methodology, interpretation and content.

Emma Dennett (Deputy Coordinating Editor): advised on methodology, interpretation and content; edited the review.

Emma Jackson (Managing Editor): coordinated the editorial process; conducted peer review; edited the review.

Elizabeth Stovold (Information Specialist): designed the search strategy; ran the searches; edited the search methods section.

Sources of support

Internal sources

  • None, Other

    The authors declare that no such funding was received for this systematic review

External sources

  • National Institute for Health and Care Research (NIHR), UK

    provision of Cochrane infrastructure funding to Cochrane Airways

Declarations of interest

Y. Oba: has provided consultation and received honoraria from Genentech unrelated to the current review.

T Patel: none known.

S Anwer: none known.

T Maduke: none known.

S Dias: none known.

New

References

References to studies included in this review

Bernstein 2011 {published and unpublished data}

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NCT00118716 {unpublished data only}

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NCT01192178 {unpublished data only}

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NCT01570478 {unpublished data only}

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NCT02127697 {published data only}

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NCT02296411 {published data only}

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NCT02433834 {unpublished data only}

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NCT02892344 {unpublished data only}

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NCT03063086 {published data only}

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NCT03184987 {unpublished data only}

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NCT03376932 {unpublished data only}

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