Functional disability in basic and instrumental activities of daily living among older adults globally: a systematic review and meta-analysis
Journal Article
Baye Tsegaye Amlak1*, Mamaru Getinet2, Addisu Getie1, Worku Misganaw Kebede1, Tadesse Tsehay Tarekegn3 andDaniel Gashaneh Belay4,5
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Jun 06, 2025
College of Health Science
Nursing
Abstract Preview:
Introduction Functional disability in older adults refers to difficulties in performing daily activities. It is usuallyevaluated based on an individual’s ability to carry out basic activities of daily living and instrumental activities of dailyliving. Although existing studies provide valuable insights, comprehensive global data on functional disability inbasic and instrumental activities of daily living among older adults remain limited. This study aims to review existingresearch worldwide to estimate the overall pooled prevalence of functional disability in these areas.Methods Systematic searches were conducted across EMBASE, Scopus, PubMed/MEDLINE, and Google Scholar fromMay 5 to July 11, 2024. Cross-sectional studies worldwide on functional disability in basic and instrumental activitiesof daily living among adults aged 60 and older, published in English up to July 11, 2024 were included. Studies wereexcluded if they did not report the outcomes of interest, were inaccessible, case reports, low quality, review articles,or published in languages other than English. Data extraction and cleaning were performed using Microsoft Excel,and STATA version 17 was used to compute the pooled effect size with 95% confidence intervals (CIs) for functionaldisability in both basic activities of daily living and instrumental activities of daily living among older adults. Toderive these estimates, we used weighted averages, where each study’s prevalence was weighted by the inverse ofits variance. Study heterogeneity was assessed using the Cochrane I² statistic and its associated p-value. Subgroupanalysis and meta-regression were conducted to identify sources of heterogeneity. Sensitivity analysis was used toevaluate the impact of individual studies on the overall results. Publication bias was assessed with Egger’s test andfunnel plots, and was addressed through trim-and-fill analysis.Results This review includes 35 studies with a total of 133,827 participants. The pooled prevalence of functionaldisability in basic activities of daily living was estimated at 26.07% (95% CI: 19.04–32.74), while on instrumentalactivities of daily living, it was estimated at 45.15% (95% CI: 36.02–54.29). After applying the trim-and-fill method,the adjusted overall prevalence of disability in basic activities of daily living was 15.12%, (a 95% CI: 11.25–19.13%).
subgroup analysis showed highest prevalence in Africa (BADL: 42.91%, IADL: 69.34%) and lowest in Asia (BADL:19.15%, IADL: 32.66%). Participants aged 65 and above, those in institutional settings, and studies with smaller samplesizes tended to report higher levels of functional disability.Conclusions Nearly one-fourth of the study participants had functional disability related to basic activities of dailyliving, while about half experienced disability in instrumental activities of daily living. This emphasizes the needfor continued effort in improving the quality of life and support systems for individuals facing functional disability,particularly in instrumental activities.Keywords Basic activities of daily living, Functional disability, Instrumental activities of daily living, Older adults.
Full Abstract:
Introduction Functional disability in older adults refers to difficulties in performing daily activities. It is usuallyevaluated based on an individual’s ability to carry out basic activities of daily living and instrumental activities of dailyliving. Although existing studies provide valuable insights, comprehensive global data on functional disability inbasic and instrumental activities of daily living among older adults remain limited. This study aims to review existingresearch worldwide to estimate the overall pooled prevalence of functional disability in these areas.Methods Systematic searches were conducted across EMBASE, Scopus, PubMed/MEDLINE, and Google Scholar fromMay 5 to July 11, 2024. Cross-sectional studies worldwide on functional disability in basic and instrumental activitiesof daily living among adults aged 60 and older, published in English up to July 11, 2024 were included. Studies wereexcluded if they did not report the outcomes of interest, were inaccessible, case reports, low quality, review articles,or published in languages other than English. Data extraction and cleaning were performed using Microsoft Excel,and STATA version 17 was used to compute the pooled effect size with 95% confidence intervals (CIs) for functionaldisability in both basic activities of daily living and instrumental activities of daily living among older adults. Toderive these estimates, we used weighted averages, where each study’s prevalence was weighted by the inverse ofits variance. Study heterogeneity was assessed using the Cochrane I² statistic and its associated p-value. Subgroupanalysis and meta-regression were conducted to identify sources of heterogeneity. Sensitivity analysis was used toevaluate the impact of individual studies on the overall results. Publication bias was assessed with Egger’s test andfunnel plots, and was addressed through trim-and-fill analysis.Results This review includes 35 studies with a total of 133,827 participants. The pooled prevalence of functionaldisability in basic activities of daily living was estimated at 26.07% (95% CI: 19.04–32.74), while on instrumentalactivities of daily living, it was estimated at 45.15% (95% CI: 36.02–54.29). After applying the trim-and-fill method,the adjusted overall prevalence of disability in basic activities of daily living was 15.12%, (a 95% CI: 11.25–19.13%).
subgroup analysis showed highest prevalence in Africa (BADL: 42.91%, IADL: 69.34%) and lowest in Asia (BADL:19.15%, IADL: 32.66%). Participants aged 65 and above, those in institutional settings, and studies with smaller samplesizes tended to report higher levels of functional disability.Conclusions Nearly one-fourth of the study participants had functional disability related to basic activities of dailyliving, while about half experienced disability in instrumental activities of daily living. This emphasizes the needfor continued effort in improving the quality of life and support systems for individuals facing functional disability,particularly in instrumental activities.Keywords Basic activities of daily living, Functional disability, Instrumental activities of daily living, Older adults.