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. 2020 Apr 23;15(4):e0232007. doi: 10.1371/journal.pone.0232007

Common mental disorders prevalence in adolescents: A systematic review and meta-analyses

Sara Araújo Silva 1,*, Simoni Urbano Silva 2, Débora Barbosa Ronca 1, Vivian Siqueira Santos Gonçalves 1, Eliane Said Dutra 1, Kênia Mara Baiocchi Carvalho 1,2
Editor: Joel Msafiri Francis3
PMCID: PMC7179924  PMID: 32324835

Abstract

An increasing number of original studies suggest the relevance of assessing mental health; however, there has been a lack of knowledge about the magnitude of Common Mental Disorders (CMD) in adolescents worldwide. This study aimed to estimate the prevalence of CMD in adolescents, from the General Health Questionnaire (GHQ-12). Only studies composed by adolescents (10 to 19 years old) that evaluated the CMD prevalence according to the GHQ-12 were considered. The studies were searched in Medline, Embase, Scopus, Web of Science, Lilacs, Adolec, Google Scholar, PsycINFO and Proquest. In addition, the reference lists of relevant reports were screened to identify potentially eligible articles. Studies were selected by independent reviewers, who also extracted data and assessed risk of bias. Meta-analyses were performed to summarize the prevalence of CMD and estimate heterogeneity across studies. A total of 43 studies were included. Among studies that adopted the cut-off point of 3, the prevalence of CMD was 31.0% (CI 95% 28.0–34.0; I2 = 97.5%) and was more prevalent among girls. In studies that used the cut-off point of 4, the prevalence of CMD was 25.0% (CI 95% 19.0–32.0; I2 = 99.8%). Global prevalence of CMD in adolescents was 25.0% and 31.0%, using the GHQ cut-off point of 4 and 3, respectively. These results point to the need to include mental health as an important component of health in adolescence and to the need to include CMD screening as a first step in the prevention and control of mental disorders.

Introduction

Common Mental Disorders (CMD) refer to depressive and anxiety disorders and are distinct from the feeling of sadness, stress or fear that anyone can experience at some moment in life. Despite some methodological differences in the epidemiological studies, it is estimated that 4.4% and 3.6% of the world adult population suffers from depressive and anxiety disorders, respectively [1]. CMD can affect health and quality of life, and it is noted that CMD affect people at an early age [2].

The Global Burden of Diseases, Injuries, and Risk Factors (GBD) study is a comprehensive study that evaluates incidence, prevalence, and years lived with disability (YLDs), which in its most recent study evaluated the period from 1990 to 2017 for 195 countries and territories, and identified that the burden of mental disorders is present for males and females and across all age groups. The findings of the GDB indicate that mental disorders have consistently formed more than 14% of age-standardized YLDs for nearly three decades, and have greater than 10% prevalence in all 21 GBD regions [3]. Mental disorders are not often correctly identified and have negative consequences on people's health.

At the population level the use of self-report psychiatric screening instruments, such as the General Health Questionnaire (GHQ), has been recommended to track CMD, also known as psychological distress/problems or psychiatric morbidity or non-psychotic mental illnesses [4]. The GHQ-12 is a short and self-report form to identify people with psychological distress or CMD [5,6]. This validated instrument comprising a multidimensional evaluation based in three factors: anxiety and depression, social dysfunctions and loss of confidence [7] and can be applied in individuals of different ages [8].

Adolescence, defined as a transitional phase between ages 10 and 19 [9] is generally perceived as a phase of life with no health problems. However, approximately 20% of adolescents experience a mental health problem, most commonly depression or anxiety [10].

Although there are preliminary data on the severity of these conditions among adolescents [11], there has been a lack of knowledge about the magnitude of CMD in adolescents worldwide. There was a systematic review of the global prevalence of CMD, published in 2014, which incorporated studies from 1980 to 2013 that surveyed people aged 16 to 65 and using diagnostic criteria other than GHQ. In addition, from this study it was not possible to identify the prevalence of CMD in adolescents [12]. In this context, a systematic review of the literature was carried out to estimate the prevalence of CMD in adolescents around the world, from item 12 of the GHQ.

Materials and methods

This systematic review followed the Preferred Reporting Items for Systematic Review and Meta-analyses PRISMA checklist [13] and for meta-analyses followed Meta-analysis of Observational Studies in Epidemiology (MOOSE) [14] guidelines.

Protocol and registration

The systematic review protocol was registered in the International Prospective Register of Systematic Reviews (PROSPERO), registration number CRD42018094763.

Eligibility criteria

The present study included observational studies. Only studies that assessed the prevalence of CMD according to GHQ-12 in adolescents (10 to 19 years old) were considered for retention. In studies that evaluated adolescents and also individuals outside the age group of interest for this review, an attempt was made to identify only those eligible through the information contained in the article or by contacting authors.

Moreover, no restrictions of language, publication date or status were applied. Studies of specific groups such as obese or diabetic individuals, adolescents in treatment of any health condition, college students, people who had traumatic experiences, pregnant teenagers and people with physical disabilities were not eligible. The ineligibility criterion considered those conditions that predispose to a higher risk of CMD, such as life events that presumably increase the chances of having feelings of stress, depression or anxiety. For example, among college students depression rates could be substantially higher than those found in the general population, probably because they experience moments of stress related to studies or future choices involving the profession phase of life [15]. Systematic reviews, interventional studies or ecological estimates were also not included.

Information sources

A systematic search of the following databases was conducted to identify relevant studies: Medline, Embase, Scopus, Web of Science, Lilacs and Adolec. A partial grey literature search was also performed in Google Scholar, PsycINFO and Proquest Dissertation and Theses. The Google Scholar search was limited to the first 200 most relevant articles. The search was conducted on December 1, 2018 and updated in April 1, 2019. Additional articles, were hand-searched in selected articles to identify potentially eligible studies not retrieved by the database search. The search strategy was reviewed by two researchers, one of them with extensive experience in systematic reviews, according to the criteria of the checklist of the Peer Review of Electronic Search Strategies (PRESS checklist) [16].

The following strategy was adapted for the databases: (Adolescent OR Teenager OR Child OR Young OR Teen OR Youth OR Juvenile OR Adolescence OR Younger) AND (“General Health Questionnaire” OR GHQ OR GHQ-12) AND (“common mental disorders” OR CMD OR Anxiety OR anxious OR depression OR dysthymia OR “generalized anxiety disorder” OR “panic disorder” OR phobia OR “social anxiety disorder” OR “obsessive-compulsive disorder” OR “mental disorder” OR “mental health” OR "Psychological stress" OR "Life Stress" OR "Psychologic Stress" OR "Mental suffering" OR Anguish OR "Emotional stress") AND (Survey OR “Cross-sectional studies” OR Prevalence OR frequency OR "Cross-sectional" OR Observational). More information on the search strategies is provided in S1 Appendix. The Covidence Software (Cochrane Collaboration software®, Melbourne, Australia) was used to remove duplicate references and for the screening procedure, applied independently.

Data collection process

The study selection process was carried out in two stages. First, the articles were selected based on their titles and abstracts, followed by a full text assessment. These two stages were carried by two independent authors (SAS and SUS) and the records that did not meet the inclusion criteria were discarded. The disagreements were resolved by consensus and counted on the participation of a third author (DBR).

Data were extracted in duplicate by authors and discrepancies were resolved by consensus. The following data were collected: authors, year of publication, year of research, country, study design, age (mean or range), sample size (sex), GHQ cut-off point and outcome of the studies (prevalence of CMD). The corresponding authors of the studies were contacted (at least two attempts of contact) in case of unavailable data.

The 12-item version of the GHQ has psychometric properties comparable to those of the longer versions of the questionnaire and the items of this instrument describe positive and negative aspects of mental health in the last two weeks and present a scale with four response options. The difference in the scale for positive and negative items indicates that the higher the score, the higher level of psychiatric disorders. The studies show great variation in the scoring methods for the GHQ, with scales ranging from zero to 12 or zero to 36.

Risk of bias within individual studies

The critical appraisal tool, recommended by The Joanna Briggs Institute for cross-sectional studies, was used to assess the risk of bias. The purpose of this appraisal is to assess the methodological quality of a study and to determine the possibility of bias in its design, conduct and analysis. This instrument consists of nine questions answered as “yes”, “no”, “unclear”, or “not applicable” [17].

For this study, when all items were answered “yes”, the risk of bias were considered low, and if any item were classified as “no” or “unclear”, a high risk of bias were expected. No scores were assigned; results were expressed by the frequency of each classification of the evaluation parameters. These ratings were not used as a criterion for study eligibility.

Summary measures and data analysis

The primary outcome was the prevalence of CMD, with a confidence interval of 95% (CI 95%). We estimated the summary measures for the total population and subgroups defined by sex, risk of bias and income level according to the World Bank classification [18]. The meta-analyses were calculated using a random-effect model and weighed by the inverse of the variance. The heterogeneity was evaluated by the Chi-square test with significance of p<0.10, and its magnitude was determined by the I-squared (I2) [19].

Meta-regressions were performed in order to identify possible causes of heterogeneity using the Knapp and Hartung test [20] with the following variables: risk of bias, sample size, proportion of female adolescent, year of study and income level. The small-study effect by visual inspection of the funnel graph and Egger's test [21] was also evaluated.

Analyzes were performed with the "Metaprop" command of the Stata software (version 14.0), adopting p<0.05.

Results

Study selection

A total of 6 351 articles were initially found in the nine electronic databases, including grey literature. After removing the duplicates, the titles and abstracts of 3 783 articles were screened, and 197 potentially relevant studies were selected for full-text reading. An additional record was selected from the reference lists of the fully read articles. A total of 126 articles were excluded for nominated reasons (see S1 Table). Forty-three studies (reported in 72 articles) [2293] were therefore selected for inclusion in this review. The screening process is detailed in Fig 1.

Fig 1. Flow chart of systematic review procedure for illustrating search results, selection and inclusion of studies.

Fig 1

*Adapted from PRISMA.

Study characteristics

Table 1 shows a summary of the study characteristics. A total of 43 studies (200 980 participants; 19 countries) were included. The CMD prevalence studies were conducted in Asia [26,27,34,39,40,45,4850,5254,57,70,89,90], America [38,41,44,84], Africa [22], Europe [24,28,32,3537,43,46,47,56,63,65,68,71,76,88,92] and Oceania [66,83]. The majority of studies (n = 33) had a cross-sectional design.

Table 1. Summary of characteristics of included studies.

Author, year Year of research Country Study design Age (mean or range) Sample size (sex) GHQα cut-off point
Amoran, 20051 NI Nigeria Cross-sectional 15 to 19 197 3b
Arun, 2009 NI India Cross-sectional 12 to 19 2 402 (boys = 1 371; girls = 1 031) 3b
Augustine, 2014 2009–2010 India Cross-sectional 15 to 19 145 (all boys) 3b
Ballbè, 20152 2011–2012 Spain Cross-sectional 15 to 19 740 (boys = 396; girls = 344) 3b
Bansal, 2009 NI NI Cross-sectional NI (9th grade students) 125 14c
Cheung, 2011 NI China Cross-sectional 14.70±2.02 719 (boys = 434; girls = 285) 11c
Czaba£a, 20053 2002 Poland Cross-sectional 13.8 1 123 (boys = 521; girls = 600) 3b
Dzhambov, 20174 2016 Bulgaria Cross-sectional 15 to 19 557 (boys = 408; girls = 149) 3b
Emami, 2007 2004 Iran Cross-sectional 17 to 18 4 310 (boys = 1 923; girls = 2 387) 7b
Fernandes, 2013 2006 India Cross-sectional 16 to 18 1 488 5b
Gale, 20045 1986 United Kingdom Longitudinal 16 (range not available) 5 187 (boys = 2 222; girls = 2 965) 3b
Gecková, 20036 1998 Slovakia Cross-sectional 15 (range not available) 2 616 (boys = 1 369; girls = 1 243) 2/3b,c
Glendinning, 2007 2002–2003 Russia Cross-sectional 14 to 15 626 4b
Gray, 2008 1998 and 2003 United Kingdom Cross-sectional 13 to 15 1 253 4b
Green, 2018 2017–2013 United Kingdom Longitudinal 16 (range not available) 1 204 (boys = 619; girls = 585) 3b
Hamilton, 2009 2005 Canada Cross-sectional 12 to 19 4 078 (boys = 2 092; girls = 1 986) 6b
Hori, 2016 2011 Japan Cross-sectional 12 to 19 744 (boys = 373; girls = 371) 4b
Kaneita, 2009 2004 Japan Longitudinal 13 to 15 516 (boys = 294; girls = 222) 4b
Lopes, 20167 2013–2014 Brazil Cross-sectional 12 to 17 74 589 (boys = 33 364; girls = 41 225) 3b
Mäkelä, 2015 2008 Finland Cross-sectional 15 to 19 225 (boys = 102; girls = 123) 4b
Mann, 2011 2007 Canada Cross-sectional 12 to 19 3 311 (boys = 1 566; girls = 1 745) 3b
McNamee, 2008 2005 Ireland Cross-sectional 16 (range not available) 868 (boys = 352; girls = 516) 4b
Miller, 2018 2018 United Kingdom Longitudinal 13 to 17 407 (boys = 204; girls = 203) 4b
Munezawa, 2009 NI Japan Cross-sectional 12 to 14 916 (boys = 568; girls = 348) 4b
Nakazawa, 2011 2008 Japan Cross-sectional 12 to 15 4 864 (boys = 2,429; girls = 2,435) 4b
Nishida, 20088 2006 Japan Cross-sectional 12 to 15 4 894 (boys = 2 523; girls = 2 371) 4b
Nur, 2012 2009–2010 Turkey Cross-sectional 15 to 19 244 (all girls) 4b
Ojio, 2016 2006 Japan Cross-sectional 12 to 18 15 637 (boys = 7 953; girls = 7 684) 4b
Oshima, 20109 2009 Japan Cross-sectional 12 to 18 341 (boys = 173; girls = 168) 5b
Oshima, 201210 2008–2009 Japan Cross-sectional 12 to 18 17 920 (boys = 8 886; girls = 9 034) 4b
Padrón, 201211 2008–2009 Spain Cross-sectional 15 to 17 4 054 (boys = 1 951; girls = 2 103) 3b
Pisarska, 2011 2004 Poland Cross-sectional 15 to 16 722 (boys = 383; girls = 335) 3b
Rickwood, 1996 1994 Australia Longitudinal 16 to 19 4 163 (boys = 1 988; girls = 2 175) 4b
Rothon, 201212 2005 United Kingdom Longitudinal 14 to 15 13 539 (boys = 7 852; girls = 7 579) 4b
Roy, 2014 2009–2010 India Cross-sectional 14 to 15 (around 80% of sample) 400 (boys = 200; girls = 200) 15c
Sweeting, 200913 1987 United Kingdom Longitudinal 15.8±3.5 months 505 2/3; 3/4;4/5b
Sweeting, 200913 1999 United Kingdom Longitudinal 15.5±3.6 months 2 196 2/3; 3/4;4/5b
Sweeting, 200913 2006 United Kingdom Longitudinal 15.5±3.8 months 3 194 2/3; 3/4;4/5b
Thomson, 201814 1991–2014 United Kingdom Cross-sectional 16 to 19 11 397 (boys = 5 376; girls = 6 021) 4b
Trainor, 2010 2001 Australia Longitudinal 13 to 17 947 (boys = 390; girls = 557) 4b
Trinh, 201515 2009 Canada Cross-sectional 15,8 2 660 (boys = 1 236; girls = 1 397) 3b
Van Droogenbroeck, 2018 2008 Belgium Cross sectional 15 to 19 680 (boys = 341; girls = 339) 4b
Yusoff, 2010 NI Malaysia Cross-sectional 16 (range not available) 90 (boys = 40; girls = 50) 4b

NI: Not informed.

αGHQ: General Health Questionnaire, 12 items.

bThe score range was 0–12.

cThe score range was 0–36.

1Amoran, 2007

2(Basterra, 2017; Gotsens, 2015)

3Bobrowski, 2007

4Dzhambov, 2018

5(Steptoe, 1996; Collishaw, 2010; Morgan, 2012)

6Gecková, 2004

7Telo, 2018

8Nishida, 2010

9Yamasaki, 2018

10(Kinoshita, 2011; Ando, 2013; Shiraishi, 2014; Kitawaga, 2017; Morokuma, 2017)

11Padrón, 2014

12Hale, 2014

13(West, 2003; Young, 2004; Sweeting, 2008; Sweeting 2010)

14(Fagg, 2008; Lang, 2011; Maheswaran, 2015; Pitchfort, 2016 and 2018)

15(Hamilton, 2011; Arbour-Nicitopoulos, 2012; Isaranuwatchai, 2014).

For the purpose of comparing the studies, we selected only those that presented the score scale from zero to 12, totaling 32 studies classified by 3 or 4 diagnostic cut-off points. Thus for the set of studies that adopted the cut-off point of 3 or more symptoms of the GHQ-12, the sample size varied from 145 adolescents in India [45] to 74 589 in Brazil [41], these studies included 96 842 adolescents between the ages of 12 and 19 years. In the set of studies with cut-off point of 4 or more symptoms, it ranged from 90 adolescents in Malaysia [90] to 17 920 in Japan [57] and the total sample was 79 892 adolescents aged 12 to 19 years.

Results of individual studies and synthesis of results

Only six (18.8%) studies were considered to be of low risk of bias. Considering that the GHQ is a self-administered instrument composed of validated questions and translated in several languages, the parameter that deals with the identification of the outcomes measured in a valid way was met by all the studies.

Two parameters were not met by most studies: (1) appropriate statistical analysis; and (2) study subjects and the setting described in detail (Fig 2 and Table 2). It is important to emphasize that the critical appraisal tool recommends that the numerator and the denominator be clearly reported, and that the percentages should be given with confidence intervals, so in the methods section there must be enough details to identify the analytical technique used and how specific variables were measured in the study. In addition, the study sample should be described in enough detail so that other researchers can determine if it is comparable to the population of interest to them. It is worth mentioning that some studies have reported the year of data collection and characteristics of the study population.

Fig 2. Risk of bias in the included studies (The Joanna Briggs Institute Critical Appraisal checklist for prevalence studies).

Fig 2

Table 2. Risk of bias for each individual study assessed by Joanna Briggs Institute critical appraisal checklist for prevalence studies.

Studies Criteria
1* 2* 3* 4* 5* 6* 7* 8* 9*
Amoran, 2005 Y Y N Y U Y Y N Y
Arun, 2009 Y Y Y Y Y Y Y N Y
Augustine, 2014 Y Y Y N Y Y Y N U
Ballbè, 2015 Y Y Y Y Y Y Y N Y
Czaba£a, 2005 Y Y Y Y Y Y Y N Y
Droogenbroeck, 2018 Y Y Y Y Y Y Y Y N
Dzhambov, 2017 Y Y Y Y N Y Y N Y
Fagg, 2008 Y Y Y Y Y Y Y N Y
Gale, 2004 Y Y Y Y Y Y Y N Y
Glendinning, 2007 Y Y Y Y Y Y Y N Y
Green, 2018 Y Y Y Y Y Y Y Y U
Hori, 2016 Y Y Y Y Y Y Y N Y
Kaneita, 2009 Y Y Y Y Y Y Y N Y
Lopes, 2016 Y Y Y Y Y Y Y Y Y
Mäkelä, 2014 Y U Y N Y Y Y N Y
Mann, 2011 Y Y Y Y Y Y Y Y Y
McNamee, 2008 Y Y Y N Y Y Y N N
Miller, 2018 Y Y Y N Y Y Y Y U
Munezawa, 2009 Y Y Y N Y Y Y Y Y
Nakazawa, 2011 Y Y Y N Y Y Y N Y
Nishida, 2008 Y Y Y Y Y Y Y N Y
Nur, 2012 Y Y Y Y Y Y Y Y Y
Ojio, 2016 Y Y Y Y Y Y Y N Y
Oshima, 2012 Y N N Y Y Y Y Y Y
Padrón, 2012 Y Y Y Y Y Y Y Y Y
Pisarska, 2011 Y Y Y Y Y Y Y Y Y
Rothon, 2012 Y Y Y Y Y Y Y N Y
Thomson, 2018 Y Y Y Y U Y Y N U
Trainor, 2010 Y Y Y Y Y Y Y N U
Trinh, 2015 Y Y Y Y Y Y Y Y Y
Yusoff, 2010 Y N U N Y Y N N Y
Rickwood, 1996 Y Y Y Y Y Y Y N Y

*Y = Yes, N = No, U = Unclear, NA = Not applicable

1*The sample was appropriate to address the target population

2*Criteria for inclusion in the sample cleary defined

3*Adequate sample size

4*Study subjects and the setting described in detail

5*Analysis conducted with sufficient coverage of the identified sample

6*Outcomes measured in a valid way

7*Objective and standard criteria for measurement

8*Appropriate statistical analysis

9*Strategies for dealing with the response rate properly

Results of individual studies

Among those that adopted the cut-off point of 3 or more symptoms, the prevalence of CMD was 31.0% (CI95% 28.0–34.0; I2 = 97.5%). In studies that used the cut-off point of 4 or more symptoms, the prevalence of CMD was 25.0% (CI 95% 19.0–32.0; I2 = 99.8%) (Fig 3). In the subgroup analysis, the heterogeneity remained high and it was observed that CMD is higher in female adolescents when considered the cut-off point 3 (Table 3).

Fig 3.

Fig 3

Common mental disorders prevalence in adolescents in studies with cut-off point 3 or more symptoms (A) and cut-off point 4 or more symptoms (B).

Table 3. Prevalence of common mental disorders, by subgroups, in adolescents.

Subgroups Number of studies Number of participants Prevalence (%) Confidence interval 95% I2(%)
Cut-off 3 or more symptoms
Sex
Male 10 42 192 23.0 21.0–26.0 92.9*
Female 9 50 863 38.0 34.0–42.0 96.9*
Risk of bias
High 8 11 506 32.0 29.0–35.0 97.3*
Low 5 85 336 30.0 17.0–45.0 98.2*
Income Level
High income 8 19 247 29.0 24.0–34.0 98.0*
Low income 5 79 745 35.0 28.0–41.0 96.9*
Cut-off 4 or more symptoms
Sex
Male 9 26 006 14.0 7.0–22.0 99.6*
Female 9 26 881 27.0 15.0–40.0 99.8*
Risk of bias
High 18 79 648 26.0 19.0–33.0 99.8*
Low 1 244 18.0 14.0–24.0 -
Income Level
High income 16 78 932 26.0 19.0–33.0 99.8*
Low income 3 960 22.0 18.0–26.0 -

*p < 0.001.

In the meta-regression, the high heterogeneity could not be explained by the studied variables: sex, income level and year of publication (p>0.05; data not shown).

The funnel graph was able to show the asymmetry between the studies, with greater representation of large studies (Fig 4). Graph A shows the studies that adopted cut-off point 3 and graph B, those that used cut-off point 4. Both illustrate that there is an effect of small studies and these findings were confirmed by the Egger's Test (p<0.001).

Fig 4.

Fig 4

Funnel graph on the prevalence of common mental disorders in adolescents in studies with cut-off point 3 or more symptoms (A) and cut-off point 4 or more symptoms (B). Egger´s test: p<0.001.

Discussion

This systematic review was able to reveal the magnitude of CMD in adolescents from all over the world. When presented at this stage of life, CMD can have negative consequences throughout the future years. The problem is common and worrying, so much has been widely studied since the 1980s [12] however, they refer to studies with diverse populations and with different ways of identification of CMD.

Mental health can be influenced by several factors. Socioeconomic characteristics [38,9497]; characteristics of lifestyle [43,56,64,83,98100] [43]and also characteristics related to affective relationships [101103], have been the focuses of studies already performed in adolescents.

Our meta-analysis revealed that very large studies were conducted in Japan and United Kingdom. It was reported that children and adolescents in Japan have greater depressive tendencies and this condition may be growing each year in several countries [104]. In the United Kingdom, the assessment and monitoring of psychological distress among adolescents is a common practice and generally performed in longitudinal studies for more than two decades [105].The evidence indicates that the relationship between culture or personal values and mental disorders differs across cultures and age groups [106]. An approach that takes into account the differences in social and cultural contexts is necessary to understand the occurrence and phenomenology of CMD in epidemiological studies, since there is a relationship between them but that needs to be better clarifies in future studies.

Although with some degree of methodological issue in most studies, since less than 20% of the studies presented low risk of bias, the results of this study indicate that CMD affect girls more, considering only the studies that adopted cut-off point 3. Permanent concern with physical appearance, body dissatisfaction, exposure to sexualization may be one of the reasons that affect girls' mental health [107].

Another factor that apparently influences the presence of CMD is income level. Even though the results presented in this systematic review showed no difference between income level of the countries and CMD, further studies with this focus are needed in order to deepen the knowledge about the subject. Longitudinal studies such as the British Household Panel Survey (BHPS) and Longitudinal Study of Young People in England (LYSPE) demonstrate the impact of economic recession and poverty in populations by strong associations between socioeconomic variables and health outcomes [76,108111].

Although the GHQ is a validated instrument for detecting CMD, the scoring scale and cut-off point are not consensual, which impairs comparison among studies. Meta-analyses in the present study were based on cut-off points 3 and 4, since they were more frequent among the studies.

In relation to age, studies are commonly defined to be representative of the population aged 15 years or more, however, it is also important to investigate the phenomenon of CMD among the younger population (10 to 14 years), since global epidemiological data consistently report that up to 20% of children and adolescents suffer from a disabling mental illness [112]. Particular attention should be paid to the most vulnerable adolescent population in order to create strategies based on scientific evidence [113]. This systematic review revealed the severity of the problem by the worldwide high prevalence of CMD among adolescents, using a standardized criterion of measurement, the GHQ-12.

Study limitations

In this review some of the eligible studies showed association data and did not present the prevalence and the respective confidence intervals, nor did they present the description of the evaluated population. It is possible that this review did not include all relevant publications, either because the articles did not present sufficient information or because the authors were not located or, finally, because of unanswered communication attempts.

It is observed that the different cut-off points for the GHQ-12 adopted in the original studies were a complicating factor in the identification of cases of CMD and in the comparison among studies. Even if measures were taken to combine studies that were as comparable as possible, this review included studies conducted at different times and places and with varying methodologies. These characteristics are revealed in the heterogeneity between the studies, typically found in cross-sectional studies and, therefore, we performed a subgroup analysis and a meta-regression, but without success.

Strengths of the study

In the elaboration of this systematic review, some steps were considered as the registration of protocol in PROSPERO, the use of the PRESS checklist, blind selection of studies, the adoption of updated analytical methods and a search strategy that enabled the capture of a large numbers of studies. An extensive search for studies was carried out in the literature sources, the grey literature, and the reference lists of the eligible articles. When necessary, the authors of potentially eligible studies were contacted to obtain extra data to carry out the meta-analyses. Moreover, this systematic review followed the PRISMA tool guide and the Meta-analysis of Observational Studies in Epidemiology (MOOSE) [14].

Conclusion

The global prevalence of CMD in adolescents was 25.0% and 31.0%, using the GHQ cut-off point of 4 and 3, respectively. CMD was more prevalent among girls when observing studies that adopted a 3 cut-off point. These results point to the need to include mental health as an important component of health in adolescence and to the need to include CMD screening as a first step in the prevention and control of mental disorders.

Supporting information

S1 Appendix. PRISMA checklist.

(DOC)

S2 Appendix. Search strategy and databases.

(DOC)

S1 Table. Details of excluded studies.

(DOC)

S1 Data

(XLSX)

Data Availability

All relevant data are within the manuscript and its Supporting Information files.

Funding Statement

The author(s) received no specific funding for this work.

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Associated Data

This section collects any data citations, data availability statements, or supplementary materials included in this article.

Supplementary Materials

S1 Appendix. PRISMA checklist.

(DOC)

S2 Appendix. Search strategy and databases.

(DOC)

S1 Table. Details of excluded studies.

(DOC)

S1 Data

(XLSX)

Data Availability Statement

All relevant data are within the manuscript and its Supporting Information files.


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