Association between sleep duration and chronic lung diseases among Chinese middle-aged and older adults: A cross-sectional study.

Short sleep duration (less than 7 hours) was significantly associated with higher odds of chronic lung diseases compared to normal sleep duration (7-8 hours).

• OR 1.29, 95% CI 1.10-1.52 after adjusting for all covariates
• Association was identified using multiple logistic regression models
• Reference group was participants sleeping 7-8 hours per night
• The association remained after full covariate adjustment

A non-linear relationship existed between sleep duration and chronic lung diseases.

• Generalized additive model and smoothing fitted curves were used to examine the non-linear relationship
• The non-linear pattern was identified in addition to the linear association found in logistic regression
• This suggests the relationship between sleep duration and CLDs is not simply proportional across the full range of sleep durations

The study sample of 13,759 participants showed that a large proportion reported short sleep duration.

• 5,773 participants (42.0%) slept less than 7 hours
• 4,711 participants (34.2%) slept between 7-8 hours (normal group)
• 3,275 participants (23.8%) slept more than 8 hours
• Data were drawn from the 2011 wave of the China Health and Retirement Longitudinal Study (CHARLS)
• Sleep duration was self-reported via structured questionnaire; CLDs were defined by self-reported physician diagnosis

Chronic lung diseases remain a major global public health concern, and prior studies on the relationship between sleep duration and CLDs have produced inconsistent findings.

• The study was motivated by inconsistent findings in previous literature regarding sleep duration and CLDs
• The study focused specifically on Chinese middle-aged and elderly adults, a population not well characterized in prior research
• Cross-sectional design was used, limiting causal inference