Abstract
Health-related quality of life (HRQoL) can be assessed through measures that can be generic or disease specific, encompass several independent scales, or employ holistic assessment (i.e., the derivation of composite scores). HRQoL measures may identify patients with differential risk profiles. However, the usefulness of generic and holistic HRQoL measures in identifying patients at higher risk of death is unclear. The aim of the present study was to undertake a scoping review of generic, holistic assessments of HRQoL as predictors of mortality in general non-patient populations and clinical sub-populations with specified conditions or risk factors in persons 18 years or older. Five databases were searched from 18 June to 29 June 2020 to identify peer-reviewed published articles. The searches were updated in August 2022. Reference lists of included and cited articles were also searched. Of 2552 articles screened, 110 met criteria for inclusion. Over one-third of studies were from North America. Most studies pertained to sub-populations with specified conditions and/or risk factors, almost a quarter for people with cardiovascular diseases. There were no studies pertaining to people with mental health conditions. Nearly three-quarters of the studies used a RAND Corporation QoL instrument, predominantly the SF-36, and nearly a quarter, a utility instrument, predominantly the EQ-5D. HRQoL was associated with mortality in 67 of 72 univariate analyses (92%) and 100 of 109 multivariate analyses (92%). HRQoL was found to be associated with mortality in the general population and clinical sub-populations with physical health conditions. Whether this relationship holds in people with mental health conditions is not known. HRQoL assessment may be useful for screening and/or monitoring purposes to understand how people perceive their health and well-being and as an indicator of mortality risk, encouraging better-quality and timely patient care to support and maximize what may be a patient’s only modifiable outcome.
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INTRODUCTION
Quality of life (QoL) as a measure of a patient’s well-being or overall health began to be used for making medical decisions in the 1970s,1 particularly for survival decisions.2 In the 1990s, patients’ own evaluations of their health status came to be considered in relation to the QoL associated with health aspects of the disease and/or its treatment as perceived by the patient.3 The term health-related QoL (HRQoL) was then conceived.3 HRQoL is an important outcome with inherent value when treating patients or improving patient care. Assessing HRQoL can guide decision-making on treatments at population and patient levels,4 and predict the success of treatment.1
A variety of instruments have been developed for assessing HRQoL. Some instruments are generic (for use in populations or sub-populations, irrespective of illness or conditions), while others are disease specific (for use in populations with a specific disease).1 Further, some instruments allow for derivation of a score as a holistic or composite assessment of the individual’s health status, while other instruments employ multiple independent scales that are reported separately. For multi-attribute utility instruments, which provide generic and holistic assessments, a single score or “utility” is obtained through a preference-based assessment of health states determined from responses to multiple items and/or dimensions.
An association between HRQoL with mortality in the general non-patient population has been systematically reviewed.5 However, HRQoL was predominantly assessed as one of multiple possible attributes or dimensions of the individual’s life.5 An association between disease-specific assessments of HRQoL and mortality has been reviewed in patients with heart failure.6,7 The ability of utilities to predict future morbidity and mortality is also being explored. Clarke and colleagues8 reported that index scores derived from the EuroQol Five Dimensions questionnaire (EQ-5D) can be used to independently identify diabetic patients at higher risk of diabetic complications and death, while querying other instruments predictive abilities. Clarke et al. also found cumulative and/or extreme problems were important in identifying high-risk patients, a determination that could only be pursued through a holistic summary measure.
Despite the available evidence, information on the relationship between holistic assessments of health status assessed with generic instruments and mortality in both general non-patient populations and clinical sub-populations has not been reported. Therefore, based on these findings and queries, and previous work on HRQoL in people with psychotic disorders,9,10 a sub-population in which there is significant premature mortality,11 the aim of this scoping review is to map the evidence on generic, holistic assessments of HRQoL as predictors of mortality in general non-patient populations and clinical sub-populations. We also aim to ascertain conditions where this relationship has been examined, instruments and statistical methods employed, findings of those analyses, and in turn identify gaps.
METHODS
The present scoping review follows the methodology of the Joanna Briggs Institute for scoping reviews12,13 and recommendations of the Preferred Reporting Items for Systematic Reviews and Meta-Analyses extension for scoping reviews (PRISMA-ScR).14 The protocol of the review was registered with the Open Science Framework (https://osf.io/vdqga) on 18 June 2020.
Data Sources and Searches
Five electronic databases (CINAHL (via EBSCOhost), EMBASE (via Ovid), Science Direct, Web of Science, and PubMed) were searched from 18 to 29 June 2020 and updated in August 2022. Searches were limited to English language with no time restrictions; syntax, filters, and Boolean operators were employed. The search strategy for PubMed is presented in the Supplementary Table 1. Records obtained were exported to EndNote X8 and duplicates deleted. The reference lists of selected articles and literature cited in the “Introduction” section were searched to identify additional articles.
Study Selection
Titles and abstracts of identified studies were screened by two independent reviewers (A.N.F. and A.N.) with full texts of selected articles and then assessed for eligibility. For inclusion, studies needed to be peer-reviewed published articles that considered generic HRQoL scores as predictors of mortality in the general population and/or sub-populations with specified conditions or risk factors, in persons aged 18 years or older. HRQoL scores needed to be assessed with a recognized and complete HRQoL generic instrument, and a holistic score provided. For instruments that assessed mental and physical components separately, both summary scores needed to be provided. Methods for the collection/reporting of mortality needed to be specified. Further, the methodology used for the assessment of predictors had to be detailed and the findings of whether HRQoL scores predicted mortality clearly stated. Studies could be conducted in any contextual setting except prison, and in any geographic location. Study designs included were as follows: case-control; cross-sectional with follow-up; retrospective and prospective cohort; randomized and non-randomized controlled trials; and quasi-experimental studies. Systematic reviews and meta-analysis were excluded.
Data Extraction and Synthesis of Evidence
The data charting form was developed by A.N.F. and A.N.; then, A.N.F. charted the data under the guidance of A.N. During extraction, results were discussed by the two reviewers and the data charting form modified to include other items of relevance to this review. Inconsistencies and disagreements were resolved by consensus; when that was not possible, K.J.C. acted as a third reviewer. Variables identified for extraction a priori were as follows: author(s), year of publication, country of origin, study population, sample size, design, instruments used, statistical method, and key findings (by type of analysis: univariate, multivariate), and during extraction: age, sex, and timeframe (i.e., follow-up). Univariate analyses were included as “proof of concept” of the overall association between HRQoL and mortality. Multivariate analyses were included as evidence of an independent association after adjustment for a range of other factors. Data extracted from each article were grouped with reference to the study population on the basis that health conditions should be given primary consideration when assessing predictors of mortality. In justification, in 2019, nearly half of global deaths (44%) and four-fifths (80%) of the top ten causes of death were due to noncommunicable causes.15 Given the heterogeneity of the results and the objective of this scoping review, a narrative synthesis was then undertaken to synthesize the findings of included studies. Specifically, a descriptive summary of studies is provided to address the review’s aims.12
RESULTS
In June 2020, 2552 records were identified through the database searches; an additional 569 records were identified in August 2022. Of a total of 3121 records, 1404 were duplicates and deleted. Title and abstract of 1717 records were then screened with 190 identified as requiring full-text review. Of these 190 articles, 115 did not meet inclusion criteria, including 54 that used a disease-specific instrument to measure HRQoL and 21 that did not employ holistic assessments; 76 articles were thus eligible for inclusion (Fig. 1). In a final step, 99 references from reference lists of eligible articles and 25 references identified within articles cited in the “Introduction” section of this study were examined, with the full-text obtained and reviewed for 37 and 7 respectively, with 31 and 4 identified as eligible. Thus, 110 articles were included in this review, for which the general characteristics and descriptive summary are presented in Tables 1 and 2, respectively.
Overview of Included Articles
Articles were published between 1997 and 2022, with over one-third (n=42) from the United States of America (USA). Nearly a quarter (n=24) pertained to people with cardiovascular diseases (CVD), followed by kidney disease (n=17), with seven pertaining to the general population. The median number of participants was 879, ranging from 36 to 105,473. Nearly three-quarters of studies (n=81) used at least one of the RAND Corporation QoL surveys: RAND-36/36-Item Short Form Survey (SF)-36, 12-Item SF Survey (SF-12), Veterans RAND 12-Item Health Survey (VR-12), and SF Six-Dimension (SF-6D). Nearly a quarter of studies (n=26) used a utility instrument, predominantly the EQ-5D (n=19); SF-6D (n=5); the Health Utilities Index Mark 3 (HUI3) (n=2); the 15-Dimensional instrument (15D) (n=1); and the Minimum Data Set Health Status Index (MDS-I) (n=1). Two studies used two utility instruments, the EQ-5D and the SF-6D (Table 2). There was variation of timeframes employed for mortality predictions, reported as total, median, and mean follow-up as well as person-years, and ranged from a median follow-up of 18.5 days to a median follow-up of 14 years.
Prediction of Mortality by Instrument
Two-thirds of studies (n=72) undertook univariate analysis and all but one (n=109), multivariate analysis, with all identified instruments employed for each. Cox proportional hazards regression was the most frequently used statistical method for both univariate and multivariate analyses (n=43 and 79 respectively), followed by logistic regression (n=17 and 25 respectively).
HRQoL predicted mortality in all but five univariate analyses, of which two employed utility instruments (EQ-5D and MDS-I). Among studies that used the SF-36 and/or SF-12 and found a univariate association (n=37 and n=15, respectively), over half of each (n=21, n=9, respectively) observed a relationship between both the physical component score (PCS) and mental component score (MCS) and mortality, including one study that used both instruments. Two studies employing the SF-36 found variation in results by sex (Table 2).
In multivariate analyses, most studies (n=100) found HRQoL predicted mortality regardless of the instrument employed. In the nine studies that did not find an association, three employed utility instruments (MHS-I, EQ-5D, and SF-6D). Instruments for which there was always an association included two utility instruments (HUI3, 15D) and the NHP (Table 2). Among studies that used either the SF-36 or the SF-12 and found an association (n=53 and n=19, respectively), over half (n=29 and n=12, respectively) observed a relationship for both the PCS and MCS and mortality, including one study that used both instruments. There were eight studies using the SF-36 that reported variation in their results by sex (n=2); age (older vs younger patients) (n=1); diabetes status (yes/no) (n=1); cause of death (all-cause vs CVD); and model tested (n=1); with inclusion of depressive symptoms (n=2); and with different confounders (n=1). Four studies using the SF-12 reported variation by model tested with inclusion of depressive symptoms; body mass index (BMI); and sociodemographic and clinical characteristics; and by changes in HRQoL over time.
Prediction of Mortality by Population
There were seven general population studies16,17,18,19,20,21,22 conducted over periods of 1 to 10 years. Three studies provided univariate results, with HRQoL predicting mortality in each17,20,21 (Fig. 2A). The results were consistent in multivariate analyses, although in one study,21 inclusion of BMI led to variation. HRQoL predicted mortality in the four studies that undertook multivariate analysis only (Fig. 2B).
Fifteen studies were conducted in persons 60 years or older,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37 and another included veterans 50 years or older (average 67.8 years).38 Studies were undertaken over periods of 1 year (total follow-up) to 14 years (median follow-up). Participants included the following: veterans enrolled in general internal medicine clinics; older persons with no specific conditions, with one or more chronic diseases, and admitted to a nursing home; a non-institutionalized population; and people receiving home-based primary care with presence of a frailty syndrome or multiple comorbidities. Of 11 studies that reported univariate analyses,23,24,25,27,28,29,31,32,35,36,38 all except one29 found HRQoL predicted mortality. However, in one study,23 results varied by sex (Fig. 2A). Multivariate analyses were undertaken in all studies, with HRQoL predicting mortality in all analyses except for persons admitted to a nursing home,29 as in the univariate analysis (Fig. 2B and Table 2). In five studies, results were found to vary by sex23; model tested31,35; model and cause of death (all-cause vs CVD)34; and eight heterogeneous samples of older persons included.24
A single article reported on postmenopausal women.39 The study was undertaken over a period of 3 years, with HRQoL predicting mortality in both univariate and multivariate analyses (Fig. 2 and Table 2).
Clinical Sub-populations
Nine articles reported on people admitted to intensive care units or emergency departments who were followed up after discharge over periods of 90 days to 7 years.40,41,42,43,44,45,46,47,48 All except four40,42,43,48 presented univariate analysis results with HRQoL predicting mortality irrespective of instrument employed (Fig. 2A). In multivariate analyses, mortality was predicted by HRQoL in all but one study.40 Further, in a study that assessed HRQoL 3 months after admission,44 mortality was predicted in a model adjusted by age and sex and in the fully adjusted model (including age, sex, and other confounders: delirium, Mini-Mental State Examination score, baseline Katz activity of daily living score, number of geriatric conditions, and Charlson Comorbidity Index score). However, when HRQoL was assessed 12 months after admission, mortality was predicted only in the model adjusted by age and sex (Fig. 2B and Table 2).
Fourteen articles reported on people with cancer49,50,51,52,53,54,55,56,57,58,59,60,61,62 over periods of 18.5 days (median follow-up) to 10 years (total follow-up). Five studies did not provide a univariate analysis.50,52,55,56,61 In all analyses, HRQoL predicted mortality irrespective of instrument employed (Fig. 2A). In multivariate analyses, mortality was predicted by HRQoL in all but one study.61
Twenty-four articles reported on people with a CVD63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86 over periods of 30 days to 8 years. Univariate analysis was undertaken in all but six studies,67,69,71,74,80,82 with HRQoL predicting mortality in all but two.83,85 Two more studies employed two instruments and found associations for each63,73 (Fig. 2A). In another study, results varied by sex, with none of the SF component scores found to predict mortality in women while, in men, the PCS was found to be a significant predictor.64 All but one article83 reported multivariate analyses. With the exception of two studies,69,85 mortality was predicted by HRQoL in all the remaining studies (including two that used two instruments63,73) (Fig. 2B). Three articles reported variation in results with HRQoL no longer predictive of mortality after the inclusion of depressive symptoms.66,78,84 Differences by sex were captured in one study64 and differences by age in another.67
Four articles reported on people with diabetes8,87,88,89 conducted over periods of 5 to 10 years. No study reported univariate results, with HRQoL predicting mortality in all multivariate analyses (Fig. 2).
Seventeen articles reported on people with a kidney disease involving people on dialysis or haemodialysis90,91,92,93,94,95,96,97,98,99,100,101,102,103,104,105,106 over periods of 6 months to 6 years. Eleven studies found HRQoL predicted mortality based on univariate analysis, including two studies that used two instruments.97,100 The other six studies did not provide univariate results.90,93,95,99,102,106 All 17 studies found HRQoL predicted mortality in multivariate analyses. Variation was found in a study that stratified people with and without diabetes98 and by changes in HRQoL over time102 (Fig. 2 and Table 2).
Only two studies were conducted in people with a liver disease107,108 over periods of 6 months and 3 years, with HRQoL found to predict mortality in univariate and multivariate analyses in both (Fig. 2).
Five studies were conducted in people with a musculoskeletal condition109,110,111,112,113 over periods of 1 to 10 years using different instruments. HRQoL was found to predict mortality through univariate analysis in four studies; the fifth did not provide results.110 In multivariate analyses, HRQoL was found to predict mortality in all studies regardless of instrument (Fig. 2 and Table 2).
Two articles reported on people with a neurological condition114,115 over periods of 1 and 4 years. In Nater et al.,115 the SF-36 PCS and the EQ-5D predicted mortality in univariate analysis, but only the SF-36 PCS in multivariate analysis. In del Aguila and collaborators,114 the SF-36 did not predict mortality in univariate analysis, but the PCS did predict mortality in multivariate analysis.
Six articles reported on people with a respiratory disease116,117,118,119,120,121 over periods of 30 days to 5 years using a variety of instruments. Four of five studies that provided results of univariate associations found that HRQoL predicted mortality, including a study that employed three instruments117 (Fig. 2A). In multivariate analyses, mortality was predicted by HRQoL in half the studies118,120,121 (Fig. 2B and Table 2).
Three more articles reported on people with dementia,122 adults infected with human immunodeficiency virus (HIV),123 and patients with systemic lupus erythematosus (SLE).124 The first two studies did not provide results from univariate associations,122,123 while the third found an association between HRQoL and mortality (Fig. 2A). Multivariate analyses found that HRQoL only predicted mortality in people with dementia with limited depressive symptoms (<6 on the Cornell Depression Scale for Dementia). HRQoL also predicted mortality in those infected with HIV, but not in people with SLE (Fig. 2 and Table 2).
DISCUSSION
This scoping review is the first to provide an overview of the literature on generic HRQoL scores as predictors of mortality across general populations and clinical sub-populations. Among the 110 studies mapped, nearly a quarter included people with cardiovascular diseases followed by people with kidney disease, dialysis, and haemodialysis. There were no studies investigating diagnosed mental health conditions. Eleven instruments were employed, the SF-36 the most used. Most studies assessed relationships through multivariate analysis using Cox proportional hazards models. For some studies using the SF-36 and SF-12, only the PCS or MCS was found to be associated with mortality in univariate and/or multivariate analyses.
Through this review, a consistent relationship between low HRQoL scores and mortality was observed independent of the generic instrument employed, with consistent findings when multiple instruments were employed.17 The relationship is clearest in the univariate analyses, but also observed in most multivariate analyses. Our finding that lower HRQoL scores are associated with mortality in general non-patient populations is consistent with results from Phyo and collaborators.5 We also found this relationship held in all clinical populations investigated in either univariate or multivariate analysis.
We acknowledge that there is no proposed mechanism through which HRQoL causes death. However, as it is not possible to perfectly measure the degree to which each person’s disease or multiple diseases in combination affect their mortality risk, HRQoL as a holistic assessment of health status appears useful for this purpose. Unadjusted results are of inherent value for standalone screening and monitoring. Additionally, disease-specific HRQoL instruments are not required as predictors of survival125,126 within the populations covered by this review.
There is some evidence of an attenuation of effect between univariate and multivariate analyses, showing the impact of specific health-related factors on the strength of association. For example, in the only two studies including people with CVD that adjusted for depressive symptoms,66,78 neither component score of the SF-36 was significantly associated with survival when depressive symptoms were included in their models. This review also identified the following variables as important to the assessment of an association: sex, cause of death, and the timepoint of assessment (e.g., 3 or 12 months post-admission to intensive care). However, multivariate analysis is not considered as useful for a simple holistic assessment of mortality risk.
Findings also support the importance of choice of timeframe in assessments. For instance, in studies employing short timeframes (up to 30 days), associations between HRQoL and mortality were found for conditions with an anticipated short life expectancy, i.e., renal cancer50 and terminal cancer54 but not otherwise.83,116 In contrast, associations between HRQoL and longer-term mortality were found in study populations with a range of different health conditions,62,65,79,82,117,118,119,120,121 suggesting that generic HRQoL measures can also be indicative of longer-term mortality risk.
Our findings identified that, when the association between mortality and HRQoL was with either the PCS or MCS of an SF survey, the PCS was more frequently associated with mortality. These findings also highlight the likely importance of different factors within holistic assessments across conditions, and the potential benefits of a single overall score as for multi-attribute utility assessments. Extending Clarke and colleagues’ findings on cumulative and/or extreme problems,8 we postulate a detailed understanding of condition-specific cumulative and/or extreme problems associated with mortality (and other events) may provide useful information for screening and/or monitoring within the clinical context.32,102
Clarke and colleagues8 also raised a question about the predictive ability of utility instruments other than the EQ-5D in people with type 2 diabetes; our review suggests this is a moot point as no other utility instruments have been employed in this sub-population. However, relationships between EQ-5D utilities and mortality were identified in all the study populations investigated, with relationships for utilities assessed with other instruments found in five of six study populations investigated.
The results of this study are subject to the review design, the review question, and specific limitations of the included studies. As a scoping review, the quality of studies and appraisal of methodological risk of bias were not undertaken.12 Likewise, due to the exploratory design of this review, the heterogeneity in the instruments used for the assessment of HRQoL, and diversity of study populations assessed, we did not report HRQoL scores. We undertook high-level comparisons only and no summary statistics were assessed. Even so, we have identified a general association between HRQoL scores and mortality, regardless of the instrument or analysis employed, for both the general population and most sub-populations with specified physical health conditions and/or risk factors.
CONCLUSIONS
HRQoL was found to be an indicator of mortality risk in the general population and most clinical sub-populations, independent of the generic instrument employed. However, no studies investigated the relationship between HRQoL and people living with diagnosed mental disorders. This is an important gap, as rates of poor physical health and mortality are much higher in people with mental disorders,127 especially those with severe mental illness,128,129 compared to the general population. In the clinical context, HRQoL assessment may be useful for screening and/or monitoring purposes to understand how people perceive their health and well-being and as an indicator of mortality risk, encouraging better-quality and timely patient care to support and maximize what may be a patient’s only modifiable outcome.
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Open Access funding enabled and organized by CAUL and its Member Institutions. This study was supported by the National Health and Medical Research Council of Australia. Grant number 1102628. A.N. is supported by a Select Foundation Research Fellowship.
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Nevarez-Flores, A.G., Chappell, K.J., Morgan, V.A. et al. Health-Related Quality of Life Scores and Values as Predictors of Mortality: A Scoping Review. J GEN INTERN MED 38, 3389–3405 (2023). https://doi.org/10.1007/s11606-023-08380-4
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DOI: https://doi.org/10.1007/s11606-023-08380-4