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Short-Term Disability Fluctuations in Late Life
Erwin Stolz1, Thomas M Gill2, Hannes Mayerl1
1Institute of Social Medicine and Epidemiology, Medical University of Graz, Austria.
Summary
Late-life disability fluctuates significantly, with short-term changes linked to mortality and increasing disability. These fluctuations, averaging one limitation, highlight dynamic changes in later life.
Area of Science:
- Gerontology
- Public Health
- Biostatistics
Background:
- Late-life disability is recognized as dynamic, but short-term, within-person fluctuations have not been previously quantified.
- Understanding these fluctuations is crucial for assessing the trajectory of aging and its associated health outcomes.
Purpose of the Study:
- To quantify the magnitude of short-term disability fluctuations in late life.
- To investigate the association of these fluctuations with time-to-death, long-term disability trajectories, frailty, and sociodemographic factors.
Main Methods:
- Analysis of monthly survey data on activities of daily living/instrumental activities of daily living (ADL/IADL) disability from 642 deceased individuals (Precipitating Events Project Study).
- A two-step statistical approach using Poisson and linear mixed regression models to identify and analyze observation-level residuals representing short-term disability fluctuations.
Main Results:
- Short-term disability fluctuations averaged approximately one ADL/IADL limitation.
- These fluctuations increased in the final four years of life and were strongly associated with overall disability increases.
- No significant associations were found with frailty or most sociodemographic characteristics, except for living alone.
Conclusions:
- Substantial short-term disability fluctuations occur in late life.
- These fluctuations are linked to mortality-related processes and accompany the general increase in disability towards the end of life.
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