Quality of life assessment instruments for adults: a systematic review of population-based studies

Abstract

Background

Against a backdrop of population aging and improving survival rates for chronic noncommunicable diseases (CNCD), researchers are placing growing emphasis on health-related quality of life (HRQoL). The aim of this study was to identify the QoL assessment instruments used in population-based studies with adults conducted around the world.

Methods

A systematic review of original research published in all languages between 2008 and 2018 was conducted. Systematic reviews and meta-analyses were excluded.

Results

Sixty-three articles (38.1% conducted in the Americas) fitted the eligibility criteria. Based on the AHRQ checklist for cross-sectional studies and the Newcastle-Ottawa scale for cohort studies, methodological quality was shown to be fair in the majority of studies (55.6%) and good in 44.4%. The country with the highest number of publications was Brazil (20.6%). Twelve types of generic instruments and 11 specific instruments were identified. The generic instrument SF-36 was the most frequently used measure (33.3% of studies). In-home interviewing was exclusively used by 47.6% of the studies, while 39 studies (61.9%) reported the use of self-administered questionnaires. Over two-thirds of the studies (34.9%) used questionnaires to investigate the association between chronic diseases and/or associated factors.

Conclusions

It was concluded that the wide range of instruments and modes of questionnaire administration used by the studies may hinder comparisons between population groups with the same characteristics or needs. There is a lack of research on QoL and the factors affecting productive capacity. Studies of QoL in older persons should focus not only on the effects of disease and treatment, but also on the determinants of active aging and actions designed to promote it. Further research is recommended to determine which QoL instruments are best suited for population-based studies.

Background

Quality of life (QoL) is a multidimensional concept that refers to an “individual’s perception of their position in life in the context of the culture and value systems in which they live and in relation to their goals, expectations, and standards” and is affected by a person’s physical health and psychological state [1]. It can therefore be assumed that the assessment of QoL should consider aspects of physical health, psychological state, level of autonomy, social relationships, beliefs, and relationship to salient features of the environment [2].

Globally, the proportion of older persons is growing and survival rates for chronic noncommunicable diseases (CNCD) are improving. Quality of Life is clinically related to several CNCD, the most common of which are cardiovascular disease, diabetes, hypertension, dyslipidemia and obesity. Clinical and epidemiological research has therefore tended to emphasize the physical health aspects of QoL, focusing on individuals’ perceptions of their living conditions in face of illness and their capacity to lead a meaningful life [3].

Given the complex nature of the concept, the assessment of QoL is a complex undertaking requiring multiple measures to capture subjectivity and multidimensionality. Various instruments have been developed to measure the above domains, adding the subjective parameters considered necessary for a comprehensive assessment of QoL [4].

The most widely used instruments are either generic, which provide an overall assessment of the impacts of health status, or specific, designed to measure particular aspects of QoL, such as QoL related to oral health, visual function, cancer, HIV, etc. [5].

The body of literature on QoL has steadily grown over recent years, spurred by the promotion of research and the cross-cultural adaptation and validation of assessment instruments in different languages [5]. However, limited information exists on the most commonly used instruments against the backdrop of current demographic and epidemiological trends. In light of the above, the aim of this study was to identify QoL assessment instruments used in population-based studies conducted with adults.

Methodology

A systematic literature review was conducted of studies around the world looking at population-based QoL surveys involving adults. The review followed the recommendations contained in the Preferred reporting items for systematic review and meta-analyses protocols (PRISMA-P) statement 2015 [6], which provides guidelines for the dissemination of systematic reviews and meta-analyses in healthcare. The review was registered in PROSPERO International prospective register of systematic reviews (registration number CRD42018101934) and is available at the following link: https://www.crd.york.ac.uk/PROSPERO/display_record.php? RecordID = 101,934.

Search strategy

A search for original articles published between 2008 and 2018 was conducted on the PubMed, Scopus and LILACS electronic databases. A search strategy was performed using the terms MeSH ‘quality of life’, ‘quality of life’, ‘life scales’, ‘HRQOL’, ‘adult’, ‘adults’, ‘elderly’, ‘elderly’, cross-sectional studies “,” Surveys “,” national survey “and” national survey” for each analyzed database (Additional Files 1, 2 and 3). The searches were performed during the period June to August 2018 and were limited to articles published between January 2008 and August 2018 in any language.

Inclusion and exclusion criteria

Articles were considered eligible if they met the following inclusion criteria: 1) Population-based studies; 2) Conducted with adults; 3) Surveys undertaken in the last 10 years (2008 to 2018); and 4) Studies involving QoL assessment instruments. Systematic reviews and meta-analyses were excluded.

Synthesis and comparison of results

Initially, two examiners (NP and NC) each carefully read the article titles and abstracts to identify the articles that fitted the eligibility criteria. Where doubts arose regarding inclusion, the entire article was read. Each examiner then read the selected articles in their entirety and filled in a data extraction form prepared by the research team containing questions based on the Newcastle Ottawa Scale (NOS) quality assessment form and Agency for Healthcare Research and Quality (AHRQ) checklist for assessing the quality of studies and other information on the articles: 1) Study characteristics: author(s); year of publication; study locality (country and continent); methodological quality score; and target population (number of participants and age group). 2) Survey characteristics: study name; year; applicability; study purpose; QoL assessment instrument used; mode of questionnaire administration (face-to-face, email, mail); and whether the examiner/interviewers received training. Disagreements between the examiners were clarified via discussion. Where disagreement persisted, a third examiner was invited to make the final decision.

Assessment of the methodological quality of the studies

The methodological quality of studies was assessed using the AHRQ checklist for cross-sectional studies and the NOS quality assessment form for cohort studies.

The AHRQ checklist contains 11 items with options “Yes”, “No”, or “Unclear”. Items answered “No” or “Unclear” are scored “0” and those answered “Yes” are given “1” [5]. Articles are classified into the following categories based on the total score: good - 8-11, fair - 4-7, and poor - 0-3. The NOS consists of eight items organized into three broad domains: selection of study groups, comparability of the groups, and ascertainment of exposure. Each item is allocated one or no star and articles are classified as “good”, “adequate”, or “poor” according to the number of stars obtained.

To aid presentation, the scores of the articles assessed using the NOS were translated to the AHRQ standards good, fair, and poor using the conversion thresholds developed by the AHRQ [7].

Criteria used to evaluate the QoL assessment methodology

The following indicators were used to evaluate the QoL assessment methodology used in the studies: 1) Type of QoL assessment instrument; 2) Interviewer training; 3) Mode of questionnaire administration; and 4) Objective of QoL assessment.

Results

The searches found 889 articles, 217 of which were duplicate and therefore excluded, resulting in the selection of 672 abstracts. After reading the titles and abstracts 566 articles were excluded. After reading the 86 remaining articles in their entirety, 63 were shown to fit the eligibility criteria and included in the final review. The survey is displayed graphically according to the PRISMA diagram (Fig. 1) and was conducted according to the PRISMA guidelines for reporting in systematic reviews (Additional file 4).

Fig. 1
figure1

Flowchart of the article selection process

Methodological quality and study characteristics

Figure 2 shows the results for methodological quality and study characteristics (Fig. 2). Further details are shown in supplementary Table 1 (see additional file 5).

Fig. 2
figure2

Methodological quality and study characteristics. References: a. Fair quality: [8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42]. Good quality: [43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70]. b [28]. and [57]. c. Americas [8,9,10,11,12,13,14,15,16, 28,29,30,31,32,33,34, 43,44,45,46,47,48,49, 58], Europe [17,18,19,20,21,22,23, 35,36,37,38, 50,51,52, 57, 59,60,61,62,63], Asia [24,25,26, 39,40,41, 53,54,55, 64,65,66,67,68,69], Oceania [27, 56, 70] and Africa [42]. d. Brazil [8, 11, 13,14,15,16, 29, 33, 34, 43,44,45, 49], United States [9, 10, 12, 30,31,32, 46, 47, 58], Korea [26, 40, 41, 55, 64,65,66,67,68], Japan [24, 25, 53, 69], France [18, 61,62,63], England [19,20,21, 35], Germany [17, 23, 59], Denmark [37, 52, 60], Australia [27, 56, 70], Thailand [39, 54], United Kingdom [22, 57], Nigeria [42], Canada [28], Mexico [48], Laos [39], Spain [38], Sweden [36], and Switzerland [51]

Survey characteristics and instruments used to assess quality of life

The surveys that produced the largest number of publications were the Korea National Health and Nutrition Examination Survey – KNHANES (Korea) [26, 41, 55, 64,65,66,67], with seven articles. The surveys assessed by this study are listed in Table 1.

Table 1 Population surveys that investigated quality of life conducted in countries from Africa, the Americas, Asia, Europe, and Oceania between 2008 and 2018

Twenty-three different QoL assessment instruments were used in the surveys, 12 of which were generic (Table 2) and 11 specific instruments (Table 3). The most commonly used instruments were the Medical Outcomes Study Short-Form 36 (MOS SF-36), found in 21 publications [8, 13, 15, 16, 18, 21, 30, 33, 36, 45, 48,49,50, 52,53,54, 59,60,61,62,63], EuroQol EQ-5D, used by 17 studies [12, 20, 25, 26, 32, 35, 38,39,40,41, 51, 55, 57, 64,65,66,67], 12-Item Short-Form Health Survey (SF-12), found in 12 articles [9, 11, 12, 14, 24, 27, 30, 32, 47, 59, 63, 69], and Visual Analogue Scale EQ-VAS, used in seven surveys [17, 23, 26, 38, 40, 55, 66].

Table 2 Generic quality of life assessment instruments used in population-based surveys 2008–2018
Table 3 Specific quality of life assessment instruments used in population-based surveys 2008–2018

With respect to mode of questionnaire administration, 47.6% of surveys (n = 30) used in-home interviewer-administered questionnaires [8, 11, 13, 15, 16, 22, 25, 27,28,29, 32,33,34,35, 38,39,40, 42,43,44,45,46, 48,49,50,51, 54, 58, 62, 68]. Seventy-nine point 4 % of studies (n = 50) used interviewer-administered questionnaires, conducted either in-home, in health centers, mobile units, or by telephone [8,9,10,11, 13, 15,16,17, 19, 20, 22, 25,26,27,28,29, 32,33,34,35, 38,39,40,41,42,43,44,45,46,47,48,49,50,51,52, 54,55,56,57,58, 60, 62,63,64,65,66,67,68, 70]. Of the 50 studies that used interviewer-administered questionnaires, 64.0% (n = 32) reported that the interviewers received training [8, 10, 11, 14, 22, 24, 25, 27, 29, 33, 34, 38,39,40, 42,43,44,45,46, 53, 54, 56,57,58, 60, 63,64,65,66, 68,69,70]. The remaining 19% of studies (n = 12) used email and mail questionnaires and online panels [13, 16, 18, 26, 35, 36, 48, 50, 55, 61, 62, 67].

When an article failed to provide information about questionnaire administration, we referred to previous publications cited in the article describing the survey methodology, making it possible to capture data on the self-administration of questionnaires.

Thirty-nine (61.9%) studies reported using self-administered questionnaires [8, 10, 12, 13, 16,17,18,19,20, 22, 24,25,26,27, 30, 35,36,37, 39,40,41, 43, 47, 48, 50, 52,53,54,55, 57, 59,60,61,62,63,64,65,66,67] with or without the presence of an interviewer. Questionnaires were read out to the respondent and the answers filled-in by the interviewer in 28.6% (n = 18) of the studies [11, 14, 15, 21, 23, 29, 31,32,33,34, 42, 46, 49, 51, 56, 58, 68, 70]. Six articles (9.5%) failed to report who filled in the questionnaire [11, 13, 15, 22, 33, 54].

With regard to the objectives of QoL assessment, 34.92% (n = 22) of the studies investigated factors associated with CNCD [10, 11, 15, 19, 26, 28, 30, 31, 37, 40, 41, 52, 55, 57, 59,60,61,62, 64,65,66,67], while 12.7% (n = 8) assessed overall health status or access to healthcare [8, 9, 12, 21, 44, 45, 47, 53] (Fig. 3). Of the 22 studies that investigated the association between QoL and CNCDs, 41,1% addressed cardiovascular disease, diabetes, hypertension, dyslipidemia, and/or obesity [11, 15, 31, 55, 57, 59, 62, 64, 67] (Fig. 4).

Fig. 3
figure3

Themes related to quality of life assessment investigated by population-based studies conducted between 2008 and 2018 (n = 63 studies). *Others: Comparison of quality of life between ethnic minorities and nontraditional community, informal careers, family members of heavy drinker, social relationships, racial discrimination, and quality of life in general

Fig. 4
figure4

Focus of studies evaluating CNCD and associated factors (n = 22 studies)

With respect to study groups, 13 studies focused exclusively on older persons [8, 21, 22, 27, 29, 38, 43, 45, 47,48,49, 51, 64], investigating matters such as overall health, oral health, chronic diseases, sleep quality, access to healthcare, successful aging, and social relationships.

Discussion

The findings show that the majority of surveys opted for generic QoL assessment instruments. This type of instrument, created to provide an objective measure of subjective sensations, has been widely used to assess the various domains of the health status of different populations [11]. Because they are multidimensional, these instruments are widely applicable, allowing researchers to compare QoL between healthy and sick individuals, patients with the same disease, and across different social and cultural backgrounds. However, they are not sensitive to specific aspects of QoL related to a particular morbidity [33].

Instruments used to measure health-related QoL (HRQoL) generally contain questions divided into groups (domains or components) and are designed to assess specific problems that limit health and well-being [11]. The World Health Organization Quality of Life Assessment (WHOQOL), Medical Outcomes Study 36-Item Short Form (SF-36), and 12-Item Short-Form Health Survey (SF-12) are among the most widely used instruments for assessing HRQoL [11].

With respect to administration of QoL instruments, the variety of methods used in the studies illustrates their practicality and ease of use for any study group and situation. The findings show that both generic and specific questionnaires can be administered by health professionals or properly trained third parties. Interviewing is the most commonly used method because it increases response rates and reduces mistakes due to misinterpretation or misunderstanding of questions. The findings show that 38.0% (n = 19) of the articles did not report interviewer training. This is concerning, because lack of training and standardization of the interview format, process cost, and presence of an interviewer can influence results [71].

In the case of self-administered questionnaires, understanding of questions and responses rates are influenced by the respondent’s education level. The absence of an interviewer increases the likelihood of misunderstanding and missing data due to missing responses and feelings of anxiety and insecurity experienced by the respondent [71, 72]. Illiterate people are more likely to be excluded from studies if they do not have anyone to assist them [71], which is an important consideration when conducting assessments with study groups with a low level of education [29, 42, 48, 73, 74]. For these groups, face-to-face interview-administered questionnaires are likely to be the best option, as observed in studies from Brazil [29], Mexico [48], and Nigeria [42]. Another bias that can arise from self-administered questionnaires is the tendency of respondents to distort responses in a favorable direction to avoid negative answers. On the other hand, privacy and low cost are potential advantages of this mode of administration [71, 75].

Questionnaires can also be administered by telephone, online panels, or mailed [71, 72]. The findings show that studies used email questionnaires [12, 24] and online questionnaires via online panels [10, 14, 20, 30, 57, 69]. The use of the internet to administer questionnaires, including QoL assessments, has risen considerably. This mode of administration has a number of advantages over pen and paper, including ease of completion, greater integrity, and elimination of data entry errors that can occur when transcribing responses from paper questionnaires. Studies have shown that the ease of use of electronic devices such as laptops, tablets, and smartphones results in greater questionnaire compliance and satisfaction, without compromising the psychometric quality of data, suggesting that electronic questionnaires can generally be considered equivalent to pen-and-paper versions, thus reducing bias, even among respondents who are less tech-savvy [76,77,78]. However, for online administration of questionnaires to provide results that are equally valid as pen-and-paper administration, each questionnaire should be validated for internet administration [79].

The majority of HRQoL studies related to CNCD focus on correlating the scores of subjective components of QoL with the CNCD and/or its risk factors. Our findings show that the main focus of QoL research was CNCD, notably cardiovascular disease, hypertension, diabetes, dyslipidemia, and/or obesity. The studies evaluated by the present study showed that the presence of these diseases and their risk factors has an impact on quality of life [15, 57, 62, 67].

In this respect, QoL assessment instruments have helped to raise important questions about the QoL of people with CNCD, particularly among adults, given they are the mainstay of a country’s productive capacity. Some of the studies indicated that research should be more focused on the development and review of national strategies for maximizing coordination of care for patients with chronic diseases and reducing the health burden and on the formulation of policies geared towards maintaining physical and mental well-being and improving HRQoL [11, 19, 31]. Collective and individual actions to promote the health of people at risk of CNCD, focusing not only on risk reduction, but also on increasing the chances of improving quality of life, were also highlighted as solutions [15].

Studies showed that QoL scores in the physical and/or mental health domains were lower in individuals with the following CNCD and/or associated factors: diabetes, high blood pressure, obesity, cancer, asthma, osteoarthritis, smoking, excessive alcohol consumption, neurological disorders, long term mental health disorders, chronic back problems, and back pain [11, 15, 19, 26, 40, 57, 60, 65, 66]. In contrast, the highest scores in the physical health domain were associated with the absence of chronic diseases and higher levels of physical activity [11].

The association between combinations of physical and mental health conditions and QoL was investigated by a study conducted by Mujica-Mota et al. [57]. The findings showed that the association between physical health and HRQoL was stronger in the presence of long-term mental health problems, highlighting the importance of addressing these problems, which are often overlooked in patients seeking treatment for physical disorders. According to the authors, integrated approaches to the diagnosis and treatment of long-term health conditions are necessary [57].

Chronic diseases are of long duration and generally slow progression, acting cumulatively to adversely affect health outcomes [31]. With respect to work, consequences of chronic diseases include absenteeism, low productivity and performance, and disability and/or economic inactivity, ultimately affecting the productive capacity of the population [10, 19, 30, 31]. Only a few studies explored the association between chronic diseases and work-related QoL [10, 13, 19, 30]. It is also important to highlight that, besides high treatment costs, poor health outcomes create a financial burden for employers [30, 31]. It is therefore vital to understand patterns of chronic conditions and their effects on QoL and health behaviors to inform interventions to prevent multiple chronic conditions, reduce their burden, and optimize service provision to affected individuals [31].

Declining birth rates, improvements in healthcare, and rising life expectancy have led to a considerable increase in the population of older persons across the globe [31]. Given that studies have reported an association between having a sedentary lifestyle and certain aspects of HRQoL during ageing [80], it is essential to promote healthy lifestyles in order to prevent chronic disease, improve the functional capacity and well-being of older persons, and help maintain autonomy and independence, thus promoting healthy and active ageing [45].

Active ageing is defined by the World Health Organization (WHO) as “the process of optimizing opportunities for health, participation and security in order to enhance quality of life as people age” [81], which is set against the term “health-related quality of life”, a narrow concept focusing on the effects of illness and treatment on quality of life [82]. In this sense, researchers have shown a growing interest in the assessment of QoL in older persons to inform policies to prevent chronic health conditions, prolong life, provide necessary social support, and promote active aging [38]. However, if aging is to be a positive experience, longer life should be accompanied by opportunities for health, participation and security, considering the specific needs, capacities, and preferences of older persons. It is therefore necessary to gain a better understanding of the factors influencing QoL in this group [38].

The findings show that the choice of QoL assessment instrument depends on the type of study. There are no “better or worse” QoL assessment instruments and the decision to use one or another, or a combination of two or more instruments, should depend on the overall purpose of the research [83]. This choice will be influenced by a series of factors, such as the characteristics of the study group and study context [84].

Implications for health care systems, policy makers and researchers

Our findings show that QoL instruments can help health professionals make informed decisions about disease management. The approach adopted by the instruments assessed in this review and the wide range of aspects of QoL they cover make them valuable tools for monitoring HRQoL. In this respect, they can provide important inputs to support the formulation of policies for improving access to health services and inform the design of health education programs to promote healthy lifestyles and active aging [11, 15, 38]. From a research perspective, we suggest that future population-based studies involving QoL assessment address issues that go beyond the effects of disease or treatment, thus filling the research gaps identified by this review.

Limitations

This review has its limitations. Despite the widescale use of the World Health Organization Quality of Life Assessment (WHOQOL-100) and its abbreviated version (WHOQOL-BREF) and version for older persons (WHOQOL-OLD) over the last two decades, these instruments were not identified in the studies. One study that used this instrument was preselected in the first stage of the article selection process (reading of titles and abstracts); however, after reading the entire article it was found that it did not meet the eligibility criteria. It is possible that the inclusion criterion population-based studies led to the exclusion of other studies that used this instrument. On the other hand, as our findings show that the widespread use of traditional instruments such as the SF-36 and its abbreviated version SF-12 in health research, coupled with the fact that they are quick and easy to use (and therefore particularly useful for large study groups), were reasons for choosing these instruments in the studies analyzed by this review.

Conclusion

The key findings of this study were as follows: the most frequently-used QoL assessment instrument was the SF-36; the preferred questionnaire administration methods were face-to-face and in-home interviewing with the presence of a trained interviewer; and the main focus of QoL studies was CNCD. There was also a lack of studies of work-related QoL and of positive experiences that promote and enhance the health, participation, and safety of older persons.

It is also important to highlight that while the use of such a wide range of instruments and modes of questionnaire administration may serve to address the specificities of particular study groups, it can hinder comparison between population groups with similar characteristics or needs, thus jeopardizing the validity, statistical reliability and, ultimately, the quality of findings.

This work brings to light important issues that should be addressed by future research aimed at investigating preferences for QoL assessment instruments and determining which instruments are best suited to population-based studies.

Availability of data and materials

All data generated or analyzed during this study are included in this published article and its Additional files.

Abbreviations

AHRQ:

Agency for Healthcare Research and Quality

CNCD:

Chronic noncommunicable diseases

EQ-5D:

EuroQol

EQ-VAS:

Visual Analogue Scale

HIV:

Human immune deficiency vírus

HRQoL:

Health-related quality of life

LILACS:

Latin American and Caribbean Health Sciences Literature

MOS SF-36:

Medical Outcomes Study Short-Form 36

NOS:

Newcastle Ottawa Scale

PRISMA-P:

Preferred Reporting Items for Systematic Reviews and Meta-analyses protocols

PROSPERO:

International Prospective Register of Systematic Reviews

Qol:

Quality of life

SF-12:

12-Item Short-Form Health Survey

WHO:

World Health Organization

WHOQOL:

World Health Organization Quality of Life Assessment

WHOQOL-100:

World Health Organization Quality of Life instrument

WHOQOL-BREF:

World Health Organization Quality of Life Assessment abbreviated version

WHOQOL-OLD:

World Health Organization Quality of Life Assessment for Older Adults

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Acknowledgements

We are grateful for the contributions of the authors of the systematic review manuscripts included in this theme issue. This study was supported by the Federal University of Rio Grande do Norte, process number 23077.037268/2018-46.

Funding

This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES) - Finance Code 001 and was supported by Postgraduate Program in Public Health at the Federal University of Rio Grande do Norte (process number 23077.014305/2019–29). The funding body played no role in any part of the design of the study and collection, analysis, and interpretation of data or writing the manuscript.

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Pequeno NPF, Cabral NLA, participated in the literature search and review, data extraction and contributed to the design, analysis and interpretation of data; article writing and critical review relevant to intellectual content; and final approval of the version to be published. Lima SCVC and Lyra CO contributed to the design, analysis and interpretation of data; article writing and critical review relevant to intellectual content; and final approval of the version to be published. Marchioni DM contributed to the article writing and critical review relevant to intellectual content a final approval of the version to be published.

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Correspondence to Nila Patrícia Freire Pequeno.

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PRISMA 2009 Checklist

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Suppl Table 1. Characteristics of the studies and population-based surveys of quality of life 2008–2018.

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Pequeno, N.P.F., Cabral, N.L.d., Marchioni, D.M. et al. Quality of life assessment instruments for adults: a systematic review of population-based studies. Health Qual Life Outcomes 18, 208 (2020). https://doi.org/10.1186/s12955-020-01347-7

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Keywords

  • Quality of life
  • Health-related quality of life
  • Population surveys
  • Systematic review