Health-related quality of life in elderly diabetic outpatients in Vietnam

Abstract

Background

Health-related quality of life (HRQoL) is an important indicator for designing care and treatment services for patients with diabetes. This is especially true given its rapid increase among the elderly population in Vietnam. HRQoL data in elderly diabetic Vietnamese are currently limited. This study aimed to 1) measure the HRQoL of elderly patients with type 2 diabetes (T2DM) in Vietnam and 2) identify related factors and their relationship with HRQoL.

Patients and methods

A cross-sectional study was conducted. We recruited 171 patients aged ≥60 years with T2DM at the Outpatient Department, National Geriatric Hospital from June to November 2015. Patients were asked to evaluate their health status using the EuroQol Five Dimensions Three Levels (EQ-5D-3L) and the Visual Analog Scale (VAS). Sociodemographic, diabetic treatment, and management characteristics were collected. Multivariate Tobit regression was used to determine which factors were associated with HRQoL, and the strength of this relationship.

Results

Patients reported some problems in all areas of the EQ-5D: pain/discomfort (50.9%), mobility (33.3%), anxiety/depression (24.0%), usual activities (21.1%), and self-care (10.5%). The mean EQ-5D index score was 0.80 (SD=0.20), and the mean EQ-VAS was 57.5 (SD=14.4). Patients who were male, lived in an urban area, could afford treatment, were taking fewer medications, and monitored blood pressure often (1–4 times a week) had a higher EQ-5D index when compared to other groups. Meanwhile, a longer duration of diabetes and older age were negatively associated with the EQ-5D index. Patients with any comorbidity had lower VAS scores than their counterparts.

Conclusion

The presence of diabetes and comorbidity were responsible for a significant decrease in HRQoL. Screening and identifying health problems, providing prompt treatment, and facilitating self-management among patients have the potential to increase diabetic patients’ HRQoL.

Introduction

Population aging is an emerging problem of priority on the global health care policy agenda.¹ The aging of the Vietnamese population has been accelerating in recent years, with substantial increases in the elderly population (aged ≥60 years) in both relative and absolute numbers.¹ It is estimated that the percentage of elder people will rise to over 30% in 2050 from 8.9% in 2009.^1,2 Ensuring sufficient care and treatment provision as well as social supports for this population has become a major challenge to the Vietnam Government.^3,4

Health-related quality of life (HRQoL) is considered an important indicator of health issues and health care needs in the elderly.^5–7 Information about HRQoL can also be used to evaluate the performance of health care services, particularly when the availability of administrative data is limited.^7,8 It can also be used to economically evaluate the effectiveness of health technologies and treatment.^7,9 HRQoL data are therefore needed in order to develop interventions and conditions favorable to the promotion of HRQoL.

Diabetes is increasingly common in low- and middle-income countries such as Vietnam. It is estimated that in 2015, over 3.5 million Vietnamese adults were living with diabetes.¹⁰ The prevalence of diabetes is especially high among the elderly. Pham and Eggleston showed that 12.8% of males and 10.9% of females living in Thai Nguyen over the age of 60 years had diabetes.¹¹ Type 2 diabetes mellitus (T2DM) is the most common form of metabolic disorder in Vietnam, with a prevalence that has doubled in the previous decade (2.7% in 2002 to 5.4% 2012).^12,13 T2DM is disproportionally prevalent in different geographic regions throughout Vietnam.^14,15 For example, in 2008, the rate of diabetes was more than 11% in Ho Chi Minh City, which is the biggest city in Vietnam,¹⁶ but less than 1% in rural Vietnam.¹⁷

Most patients with T2DM in Vietnam receive care on an outpatient basis, with hospital visitation used for regular physical assessment and management of complications. Elderly T2DM patients often suffer from comorbidities and geriatric syndromes that contribute to the development of frailty, defined as the cumulative decline of multiple physiological functions (eg, muscle weakness, low gait speed, etc.).^18,19 The combination of diabetes and comorbidity can increase the likelihood of adverse outcomes, such as falls, disability, death, and hospitalization,^19,20 all of which can significantly impair a patient’s quality of life.^21–23 Moreover, geriatric syndromes are a major obstacle when providing treatment and care to diabetic patients.^18,22,24 Therefore, it is necessary to investigate the HRQoL of these patients, and associated factors, so that interventions designed to improve HRQoL can be developed and deployed.

Evaluations of HRQoL in elderly diabetic populations have been conducted worldwide in Asia,^25,26 Europe,^27–30 and the USA.³¹ Determinants of HRQoL have been found to vary across studies. Most have found correlations between HRQoL and sex, age, capacity to pay for treatment, occupations, income, body mass index (BMI), comorbidities (cardiovascular diseases, neuropathy, etc.), and treatment modalities like insulin or exercise.^{25,27,28,30,32} However, few evaluations of HRQoL in diabetic populations have been completed in resource-scarce settings like Vietnam. Therefore, the objective of this study was to measure the HRQoL of elderly patients with T2DM in Vietnam and identify its covariates.

Patients and methods

Study design

A cross-sectional study was conducted from July to November 2015 at the Outpatient Department, National Geriatric Hospital. A convenience sampling approach was used to recruit patients. To participate in the study, all subjects had to be 1) aged 60 years and older, 2) diagnosed with diabetes according to diagnostic criteria set out by the International Diabetes Federation in 2013, 3) undergoing treatment as an outpatient at the National Geriatric Hospital, and 4) able to communicate with the data collector. Patients were excluded if 1) they were unable to complete the questionnaire and 2) they refused to participate in the study. A sample of 171 patients was recruited.

Measures and instruments

A structured questionnaire was developed and used for 25-min face-to-face interviews. Data collectors were students who were enrolling in undergraduate medical doctor and nursing degrees at Hanoi Medical University. To avoid social desirability bias, we did not use physicians and nurses employed at the hospital research site for collecting data. We conducted several training sessions for data collectors to ensure that they asked questions consistently and obtained high-quality data. The questionnaire included the following variables.

Primary outcomes

HRQoL was measured using EuroQol Five Dimensions Three Levels (EQ-5D-3L),²⁵ which consists of five dimensions: mobility, self-care, usual activities, pain/discomfort, and anxiety/depression. Each dimension has three levels of responses: level 1; no problems; level 2: some problems; level 3: extreme problems. Health states were converted into a weighted index by applying scores from the UK utility tariffs set due to the unavailability of a Vietnamese tariff.³³ The EQ-5D index score ranged from −0.594 to 1, with a higher index depicting better HRQoL.³³ We also employed the EQ Visual Analog Scale (EQ-VAS) to record the participant’s self-rated health on a vertical scale that ranges from 0 to 100. Zero represents the worst health state a patient can imagine and 100 represents the best health state a patient can imagine.

Covariates

Sociodemographic and behavior characteristics included age, sex (male/female), education attainment that was classified into three categories (low education: lower high school; medium education: graduate high school; high education: tertiary education), living location (urban/rural), people living with family/relatives/others/alone, who their primary informal caregiver was (family/relatives/others/none), the ability to pay for treatment (yes/no), smoking status (yes/no), and if they were a current alcohol user (yes/no).

We measured the weight and height of participants to calculate their BMI. We used three BMI categories: <18.50 kg/m² (underweight), 18.5–24.99 kg/m² (normal), and ≥25.00 kg/m² (overweight/obesity). Moreover, information on comorbidities was given by patients’ self-reported data and confirmed by investigator based on medical records and medication utilization.

We also collected data on patients’ diabetes treatment characteristics such as their disease duration, treatment modality (oral antidiabetic drug, insulin, both or doing exercise only), number of medicines, whether they forgot to take medicine in the last 4 weeks (yes/no), fasting plasma glucose (mmol/L), and HbA1c (%) level. Glycemic goals for adults with diabetes were achievement of fasting plasma glucose ≤7.2 mmol/L and HbA1c <7%.³⁴ Other characteristics such as self-monitoring of blood glucose at home (yes/no), frequency of blood pressure monitoring and exercises, diet modification (yes/no), and if patients had ever delayed an examination were also collected.

Data analysis

Data analysis was performed using STATA 12.0 software (Stata Corp. LP, College Station, TX, USA). First, we described variables by using frequency and percentage for categorical variables, and mean and standard deviation for continuous variables. Multivariate regression was used to identify the factors associated with the EQ-5D index and EQ-VAS. Because the outcome data were censored data, we employed Tobit regression (or censored regression) model to have better estimation compared to typical linear regression. Stepwise forward selection strategies were used to produce the reduced model. These strategies selected variables into the final models using the threshold of p-value at 0.2 for the log-likelihood ratio test. Statistical significance was defined as any p-value less than 0.05.

Ethics approval and informed consent

The study was approved by the National Geriatric Hospital Research Ethics Committee (No 794 NGH IRB). Written informed consent, which was approved by the Research Ethics Committee of the National Geriatric Hospital, Hanoi, Vietnam, was obtained from all participants in this study prior to data collection.

Results

Among 171 patients, the mean age was 69.4 years (SD=6.8). The majority of the patients were females (58.5%), had a medium education (35.1%), lived in an urban area (94.7%), and lived with family (93.6%). Most of them were taken care by their families (94.2%) and were able to pay for diabetes treatment (81.9%). In addition, 93% of patients had comorbidities. The mean EQ-5D index was 0.80 (SD=0.20), and the mean EQ-VAS was 57.5 (SD=14.4) (Table 1).

Table 1.

Socioeconomic and behavior characteristics of respondents

	n	Percentage
Total	171	100.0
Sex, female	100	58.5
Education attainment
Low education	57	33.4
Medium education	60	35.1
High education	54	31.6
Living location
Urban area	162	94.7
Rural area	9	5.3
Living with
Family	160	93.6
Alone	7	4.1
Others	4	2.3
Being taken care by
Family	161	94.2
Other people	6	3.5
None	4	2.3
Able to pay diabetes treatment	140	81.9
Have health insurance	170	99.4
Smoking	38	22.2
Alcohol use	138	80.7
Comorbidities
Yes	159	93.0
No	12	7.0
Body mass index categories
Underweight	5	2.9
Normal	138	80.7
Overweight/obesity	28	16.4
	Mean	SD
Age (years)	69.4	6.8
EQ-5D index	0.80	0.20
VAS	57.5	14.4

Abbreviations: EQ-5D, EuroQol Five Dimensions; VAS, Visual Analog Scale.

Table 2 depicts that most of the patients had a diagnosis that was over 10 years old (49.1%). The most common treatment modality was oral medications (50.3%). More than five oral prescriptions were prescribed to 45.6% of patients for diabetes mellitus or other comorbidities. The average fasting plasma glucose was 7.8 mmol/L (SD=2.2) and HbA1c was 7.1% (SD=1.5%).

Table 2.

Treatment characteristics among respondents

	n	Percentage
Duration of diabetes
<1 year	7	4.1
1–5 years	35	20.5
6–10 years	45	26.3
>10 years	84	49.1
Treatment therapy
OAD	86	50.3
Insulin	25	14.6
OAD and insulin	56	32.7
None	4	2.4
Number of medicines
<3	28	16.4
3–5	65	38.0
>5	78	45.6
	Mean	SD
Fasting plasma glucose (mmol/L)	7.7	2.2
HbA1c (%)	7.1	1.5

Abbreviation: OAD, oral anti-diabetic drug.

Self-management of respondents is shown in Table 3. Most respondents performed self-monitoring blood glucose at home (69.0%), modified their diet (86.6%), and always did their exercises (77.8%), whereas 42.7% always monitored their blood pressure at home. Only 3.5% of patients delayed their examinations and 17.0% forgot to take their medication in the last 4 weeks (Table 3).

Table 3.

Diabetes self-management of respondents

	n	Percentage
Self-monitoring blood glucose at home
Yes	118	69.0
No	53	31.0
Frequency of blood pressure monitor
Always (5 times per week or more)	73	42.7
Often (1–4 times per week)	42	24.6
Rarely (1–3 times per month)	44	25.7
Never	12	7.0
Diet modification
Yes	148	86.6
No	23	13.5
Frequency of doing physical exercises
5 times per week or more	133	77.8
1–4 times per week	12	7.0
1–3 times per month	11	6.4
Never	15	8.8
Ever delayed examination
Yes	6	3.5
No	165	96.5
Forgot to take medicine
Yes	29	17.0
No	142	83.0

Figure 1 shows the HRQoL status of participants described with the five dimensions of the EQ-5D-3L. One-third of the sample had some problems (level 2) in mobility (33.3%), whereas 50.9% and 24.0% had some problems in pain/discomfort and anxiety/depression, respectively. About 81.3% of individuals were able to do daily activities in the last 2 weeks and 81.3% patients felt tired in the last 7 days.

Figure 1.

HRQoL of participants described with the EQ-5D-3L instrument.

Abbreviations: HRQoL, health-related quality of life; EQ-5D-3L, EuroQol Five Dimensions Three Levels.

Figure 2 shows the mean VAS score based on age group. The group aged 60–64 years had the highest mean VAS score: 60.1 (SD=13.2).

Figure 2.

Mean EQ-VAS score for age groups.

Abbreviation: EQ-VAS, EuroQol Visual Analog Scale.

Table 4 presents the factors associated with HRQoL among diabetic patients. In terms of EQ-5D index, patients who were male, living in an urban area, could afford treatment, were taking fewer medications, and often monitored their blood pressure (1–4 times/week) had a higher EQ-5D index compared to others. Meanwhile, higher duration of diabetes and older age were negatively associated with the EQ-5D index. Participants who had any comorbidities had lower VAS scores than their counterparts. Those living in urban areas and taking 3–5 drugs had higher VAS score than those living in rural settings and taking more than 5 drugs, respectively.

Table 4.

Factors associated with HRQoL among diabetic patients

	EQ-5D index		VAS
	Coef	95% CI	Coef	95% CI
Sex (male vs female)	0.22*	0.11; 0.34	4.80	−0.40; 10.01
Age	−0.01*	−0.02; −0.00
Living location (urban vs rural)	0.33*	0.13; 0.54	12.13*	1.28; 22.98
Afford diabetic treatment (yes vs no)	0.16*	0.01; 0.30
Duration of diabetes (vs <1 year)
6–10 years	−0.14*	−0.25; −0.02
Treatment modalities (vs none)
Insulin	−0.12	−0.26; 0.01	−6.71	−13.87; 0.45
Number of drugs used (vs >5 drugs)
<3 drugs	0.23*	0.08; 0.38	5.19	−2.22; 12.59
3–5 drugs	0.19*	0.07; 0.30	9.77*	4.14; 15.39
Self-monitoring blood glucose at home (yes vs no)	0.07	−0.04; 0.19
Having comorbidities (yes vs no)			−10.16*	−19.00; −1.33
Frequency of doing exercises (vs none)
1–4 times/week	0.14	−0.05; 0.33
Forgot to take medicine (no vs yes)	0.16	−0.07; 0.39
Frequency of monitoring blood pressure (vs none)
1–4 times/week	0.21*	0.07; 0.34

Note:

^*p<0.05.

Abbreviations: HRQoL, health-related quality of life; EQ-5D, EuroQol Five Dimensions; VAS, Visual Analog Scale; CI, confidence interval.

Discussion

Our study was among the first research offering needed insights about the HRQoL of elderly Vietnamese with T2DM. In this study, we found that elderly patients with T2DM had a lower EQ-5D index and VAS score when compared to the general elderly Vietnamese population.³⁵ This result was also lower than HRQoL of elderly patients with diabetes in Korea³⁶ and India,³⁷ but higher than that in Saudi Arabia.³⁸ Moreover, our elderly diabetic patients reported substantially high rates of having problems in pain/discomfort, mobility, and anxiety/depression, which align with other studies on Asian populations.^21,36,39,40

After using multivariate regressions to adjust for sociodemographic characteristics, our results showed that those suffering from comorbidities were more likely to report lower HRQoL, being consistent with worldwide studies.^{26,27,30,41,42} In our cohort, we observed that hypertension and dyslipidemia were the most common comorbidities. Our results also demonstrated that polypharmacy was associated with lower HRQoL. Multiple drugs were often prescribed to patients to manage their T2DM (ie, insulin, anti-hypoglycemic drugs, etc.), comorbid conditions, and related complications. Over-prescription and polypharmacy pose increased risk of adverse drug reactions in the elderly due to physiological changes that result in impaired drug metabolism and excretion.⁴³

In addition, we also found that higher duration of diabetes was found to have a significantly negative association with patients’ HRQoL, which is consistent with some previous studies.^39,44 Geriatric syndromes, increasing age, and T2DM often require some forms of long-term management and treatment of sequelae, which may compound in those with a longer disease duration.^45,46 In middle- to low-income countries like Vietnam, management of these chronic conditions places a heavy socioeconomic and emotional burden on both patients and their families.^47–49 It is likely that our decreased HRQoL in those with a longer disease duration is a combination of compounding comorbidity and complications along with the impact of socioeconomic and emotional burden.

In this study, we found that people with insulin treatment had lower HRQoL compared to those not using any therapies; however, the association was insignificant. Lu et al found that both insulin and oral agent use were associated with lower EQ-5D index scores.⁴⁴ In addition, Luk et al found that insulin use was associated with higher EQ-5D index, but with a lower VAS score,³⁹ whereas other work has found that treatment therapies had no impact on HRQoL.^21,40,50 The lower HRQoL in insulin-treated patients is likely explained by the suffering associated with a heavier burden in patients with more advanced disease, along with the diverse set of complications that come with it.⁴¹ The difference between our study and other previous studies may be due to the smaller sample size and more advanced age of our cohort. Moreover, Maatouk et al suggested that insulin injections might carry lower stigma in the elderly than in younger adults.³⁰ In addition, the lower HRQoL could be caused by the pain of multiple daily insulin injections and the patients’ beliefs that taking insulin means the diabetes is worse and the patient has failed.⁵¹ Therefore, this finding points the need of educational counseling programs for insulin-treated patients from the health staff.

Self-monitoring of blood glucose and hypertension are common home management practices among elderly patients. In this study, we found that frequent monitoring of blood pressure was positively associated with higher HRQoL. Hypertension is both a complication and risk factor of diabetes.¹³ This illness is also a risk factor of other diseases such as stroke and cardiovascular diseases.⁵² Self-monitoring is associated with improved self-care and better treatment compliance, leading to the improvement of health status and HRQoL in patients with chronic diseases.^31,53

This study has several implications. First, providers of patients with longer disease duration are cognizant of the increased burden faced by those with advanced disease. Interventions focused on improving psychological and emotional wellbeing may improve the HRQoL of patients by addressing important illness and burden-related concerns more common to advanced disease. Second, health care providers should provide education to patients about the importance and effectiveness of self-management practices, such as regular blood pressure and blood glucose monitoring. Moreover, the role of the family in supporting patients in being successful in the self-management of their disease, thereby slowing its advancement, should also be emphasized. Finally, larger future studies should be conducted to fill in the gaps about the HRQoL impact of insulin-related complications among Vietnamese diabetic patients.

There were several limitations to this study. First, its cross-sectional design restricts the drawing of causal relationships between HRQoL and potential associated factors. Second, our use of convenience sampling limits the generalizability of our study to other hospital settings. The effects of recall bias in our data, due to the use of mainly self-reported data, further limit our results.

Conclusion

Our study is the first examination of the HRQoL among elderly diabetic patients in Vietnam. Significant decreases in reported HRQoL were related to disease duration, comor-bidity, treatment modality, and self-management practices. Screening and identifying health problems in these patients, as well as providing prompt treatment and facilitating self-management, offer low-cost solutions to improving HRQoL in a resource-scarce setting.