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Study design

This harmonized analysis combined data from 26,022 adults aged 60 and older across the China Health and Retirement Longitudinal Study, English Longitudinal Study of Ageing, and US Health and Retirement Study. Researchers assessed four non-cognitive domains of intrinsic capacity and related them to repeated cognition and incident impairment.

What it found

Each additional impaired domain was associated with lower longitudinal cognition and higher odds of incident impairment (odds ratio 1.23) and sustained low performance (1.27). Episodic-memory analyses showed a similar association. Effects varied across cohorts, and adjustment for baseline cognition reduced some estimates.

Limits and interpretation

This individual-participant analysis is observational. Its four-domain profile is a partial construct, not a diagnostic test, and the findings do not show that changing those domains prevents impairment. The authors frame it as population surveillance and hypothesis generation.

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Sources

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