What this means
People who slept under 6 hours at night had higher odds of psychological frailty. The study cannot show that short sleep causes this frailty.
Plain-English summary written by an AI model from the abstract. The original is below.
- Who it was tested in
- 9,476 Chinese adults aged 45 and older
- Kind of research
- A study
The science
- Original title
- Nonlinear associations between sleep duration and psychological frailty in an aging Chinese population: insights from a national cohort.
- Authors
- Ouyang J, Wang Y, Shen Y et al.
- Journal
- Aging & mental health
- Published
- Oct 14, 2026
- Study type
- Study
- PMID
- 42873651 ↗
Abstract
Background
To examine the longitudinal and nonlinear association between sleep duration and psychological frailty in middle-aged and older Chinese adults.
What they did
We analyzed 9,476 participants aged ≥45 years in the China Health and Retirement Longitudinal Study. leep duration was reported in 2011, and psychological frailty was assessed using thePsychological Frailty Index in 2018. We examined associations using multivariable logistic regression and restricted cubic splines. Sensitivity analyses incorporated sleep measurements from 2013 and 2015, three-wave average sleep duration, sleep trajectories, and multiple imputation.
What they found
Short nighttime sleep (<6 h) was associated with higher odds of psychological frailty compared with 6-8 h of sleep (OR = 1.27, 95% CI: 1.08-1.51, p = 0.005). We observed nonlinear associations, with estimated turning points at 7.56 h for nighttime sleep and 8.55 h for total sleep. Persistent short sleep was also associated with higher odds of psychological frailty (OR = 1.44, 95% CI: 1.15-1.81, p = 0.002). Multiple-imputation analyses yielded broadly similar estimates. Short nighttime sleep and persistent short sleep were associated with psychological frailty in middle-aged and older Chinese adults. These findings suggest that sleep duration may be relevant to psychological health although causal relationships remain to be established.
The authors' abstract, grouped under plain headings from its own section labels.
Ouyang J, Wang Y, Shen Y et al. Nonlinear associations between sleep duration and psychological frailty in an aging Chinese population: insights from a national cohort. Aging & mental health. 2026. doi:10.1080/13607863.2026.2747132. PMID: 42873651. https://pubmed.ncbi.nlm.nih.gov/42873651/