Cumulative impairment across WHO ICOPE domains linked to depression risk in rural Taiwan elders

Older adults in rural Taiwan who show impairments in multiple domains of intrinsic capacity—the composite of physical and mental abilities that the World Health Organization uses to track healthy aging—carry substantially higher odds of depressive symptoms and cognitive impairment, according to a study published in Aging Clinical and Experimental Research.

The study applied the WHO Integrated Care for Older People, or ICOPE, framework, which operationalizes intrinsic capacity for community screening across domains such as cognition, mobility, nutrition, hearing, vision and psychological well-being. Although the framework is designed for exactly this kind of frontline monitoring, the authors note that the combined and longitudinal effects of cumulative impairment in rural Asian populations had remained insufficiently characterized. Their dataset drew on ICOPE Step 1 screening records from 1,658 rural community-dwelling older adults, analyzed with a dual design covering both a cross-sectional snapshot and a three-year longitudinal window.

Statistically, the team used mutually adjusted and Firth penalized logistic regression to estimate adjusted odds ratios, a choice that guards against unstable estimates when certain impairments are uncommon. Depressive symptoms emerged as independently associated with three specific impairments: hearing loss carried an adjusted odds ratio of 2.57 (95 percent confidence interval 1.58 to 4.16), mobility impairment an odds ratio of 2.38 (1.46 to 3.88), and nutritional impairment the strongest single signal at 4.97 (2.46 to 10.07). In other words, older adults with nutritional impairment had nearly five times the odds of depressive symptoms compared with those without it, after adjustment for the other measured factors.

Cognitive impairment followed a different pattern. Here the independent correlates were age itself, with an odds ratio of 1.03 per additional year (1.01 to 1.04), and mobility impairment, at 1.52 (1.15 to 2.02). The divergence is notable: depressive symptoms tracked sensory, movement and nutritional domains, while cognitive impairment aligned with chronological age and mobility rather than the same cluster of capacities. This suggests the two outcomes, though often screened together, may reflect partly distinct underlying processes in this rural population.

Beyond single domains, the researchers pre-specified what they called a “Double-Hit” indicator: the concurrent presence of a sensory impairment and a physical or nutritional impairment. Evaluated with receiver operating characteristic analysis and DeLong tests for comparing model discrimination, this combined marker was associated with depressive symptoms at an adjusted odds ratio of 3.48 (2.13 to 5.57). It also improved discrimination over a purely sociodemographic model, lifting the area under the curve from 0.55 to 0.62, a difference the authors report as statistically significant at p = 0.025. However, the Double-Hit did not improve discrimination beyond a model that already included the individual domains, which reached an AUC of 0.71. The combined marker, in short, adds predictive value over basic demographics but not over simply measuring each domain separately.

When cumulative impairment was modeled continuously rather than as a binary combination, the data showed a linear dose-response for depressive symptoms: each additional impaired domain was associated with an adjusted odds ratio of 1.79. This graded association for depressive symptoms suggests that the cumulative burden of impairment matters in this population, consistent with the ICOPE framework's emphasis on monitoring multiple domains rather than screening for isolated conditions.

The longitudinal arm of the study followed 454 participants contributing 1,018 observations, modeled with generalized estimating equations to track depressive symptom trajectories over time, with inverse-probability-of-retention weighting applied to address selective dropout. The key longitudinal test—the interaction between time and mobility impairment—did not reach statistical significance (β = 0.56, p = 0.15), meaning the data did not demonstrate that the effect of mobility impairment on depressive symptoms changed in strength over the three-year period. The authors are candid about this limitation: the longitudinal subsample was underpowered and selectively retained, so these trajectory findings should be read as preliminary.

The discussion section emphasizes that the cross-sectional associations were robust to penalized estimation methods and to alternative specifications of the Double-Hit indicator, strengthening confidence in the reported odds ratios. At the same time, the authors state plainly that causal inference is precluded by the study design. Because the data come from routine screening rather than randomization, the authors state that causal inference is precluded, so the direction of the associations between impairments and depressive or cognitive symptoms cannot be determined. The authors also note that the longitudinal subsample was underpowered and selectively retained, limiting the trajectory findings.

Despite these constraints, the authors conclude that the findings support multi-domain ICOPE monitoring in rural primary care settings. The study, published as an open-access research article on 17 October 2026, is currently available as a peer-reviewed accepted manuscript that will be replaced by the final version of record. The authors call for adequately powered longitudinal confirmation to establish whether the observed cross-sectional dose-response holds as a true predictive relationship over time.

Subject of Research: Associations between cumulative intrinsic capacity impairment and cognitive and depressive symptoms in rural community-dwelling older adults in Taiwan, analyzed with the WHO ICOPE framework

Article Title: Cumulative intrinsic capacity impairment and the risk of cognitive and depressive symptoms among rural community-dwelling older adults in Taiwan: a cross-sectional and three-year longitudinal analysis using the WHO ICOPE framework

Article References: Liao, C.-C., Lin, T.-W., Wong, C. Y.-S., Chen, H.-S., & Liang, K.-L. (2026). Cumulative intrinsic capacity impairment and the risk of cognitive and depressive symptoms among rural community-dwelling older adults in Taiwan: a cross-sectional and three-year longitudinal analysis using the WHO ICOPE framework. Aging Clinical and Experimental Research. https://doi.org/10.1007/s40520-026-03550-w

Image Credits: AI Generated

DOI: 10.1007/s40520-026-03550-w

Keywords: intrinsic capacity, WHO ICOPE framework, older adults, depressive symptoms, cognitive impairment, rural Taiwan, community screening, mobility impairment, nutritional impairment, hearing loss, longitudinal study, adjusted odds ratios