Lagged effects of risk factors on the disability of older adults: A distributed lag non-linear model approach.
Yitong Mao, Zhiting Guo, Wen Gao and 2 others
PMID 41684608WHAT IT FOUND
Risk factors for disability in older adults follow three distinct timelines.
Functional limitations like walking difficulty cause immediate harm within one year, while conditions like depression and hospitalization exert a cumulative burden over three to four years.
Key findings
01Early-phase risk factors, such as walking and stooping difficulty, exert their strongest impact immediately or within the first year, reflecting direct impairment of physical functions.
02Mid-phase risk factors, including arthritis and stroke, show delayed peaks in risk at two to three years, suggesting underlying processes like changes in physiological reserve and self-management.
03Late-phase risk factors, such as hospitalization, depression, and high systolic blood pressure, have persistent effects that accumulate over three to four years.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTsWhat it means for RNs
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What it does not show
The analysis was restricted to data from 2011–2015 due to missing physical measurements in later waves, limiting the temporal scope. The study examined individual risk factors but did not analyze potential interactions between them. Some data, such as self-reported health and memory, were subject to information bias. Findings are based on a Chinese population and may not generalize to other regions.
Declared interests
The study was supported by the Scientific Research Fund of National Health Commission of the People’s Republic of China. The authors declared no conflict of interest.
The easy way to misread this
Do not assume all risk factors have the same timeline. A functional limitation like walking difficulty predicts disability within a year, whereas depression and high blood pressure exert a cumulative burden over three to four years. Interventions should be timed according to these distinct lag patterns.