Sleep duration in 2011 and psychological frailty in 2018 among middle-aged and older Chinese adults
In a Chinese national cohort, short nighttime sleep reported in 2011 was associated with higher odds of psychological frailty assessed in 2018; the link was nonlinear, and persistent short sleep was also associated with higher odds. Causality is not established. [1]
Automatic summary · not editorially reviewed
The key findings
Sleep duration was reported in 2011 and psychological frailty was assessed in 2018 in 9,476 Chinese adults aged 45 or older. [1]
Short nighttime sleep was associated with psychological frailty, with a nonlinear relationship and an estimated turning point at 7.56 hours. [1]
Persistent short sleep was associated with higher odds of psychological frailty (OR = 1.44, 95% CI: 1.15-1.81). [1]
The source at a glance
- Study type / format
- Longitudinal observational cohort analysis (abstract only).
- Population / context
- 9,476 middle-aged and older Chinese adults aged 45 or older in the China Health and Retirement Longitudinal Study.
- Summary based on
- Study abstract
- Original publication
- October 14, 2026
Sleep in 2011, frailty in 2018 in Chinese adults
The study asked whether sleep duration is linked to psychological frailty over time in middle-aged and older Chinese adults. It used data from 9,476 participants aged 45 or older in the China Health and Retirement Longitudinal Study. Sleep duration was reported in 2011, and psychological frailty was assessed in 2018 using the Psychological Frailty Index. Because sleep was measured years before the frailty assessment, the design looks at an earlier exposure and a later outcome; it cannot show that short sleep caused frailty.
Supporting source [1]
Nonlinear link with turning points near 7.6 and 8.6 hours
Associations were examined with multivariable logistic regression and restricted cubic splines, a method that allows a curved rather than straight-line relationship. Short nighttime sleep was associated with psychological frailty (p = 0.005). The associations were nonlinear, with estimated turning points at 7.56 hours for nighttime sleep and 8.55 hours for total sleep. The abstract does not report the size of the odds ratio for short nighttime sleep itself, so the strength of that particular association is not stated here.
Supporting source [1]
Persistent short sleep and sensitivity analyses in the cohort
Persistent short sleep was associated with higher odds of psychological frailty (OR = 1.44, 95% CI: 1.15–1.81, p = 0.002). Sensitivity analyses used sleep measurements from 2013 and 2015, a three-wave average sleep duration, sleep trajectories and multiple imputation; the multiple-imputation analyses gave broadly similar estimates. The authors conclude that short and persistent short sleep were associated with psychological frailty and that sleep duration may be relevant to psychological health, while causal relationships remain to be established.
Supporting source [1]
How to interpret this
Abstract only; the full text was not reviewed. This is an observational cohort analysis, so associations do not establish causation, as the authors note. The abstract does not report the odds ratio for short nighttime sleep itself or details on how sleep was measured.
Based on the study abstract; the full paper, tables and supplementary data were not reviewed.
Source & supporting passages
Ouyang J, Wang Y, Shen Y, Lu Y, Lv W. · europepmc.org · October 14, 2026