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A cohort study of association between sleep duration and cognitive impairment in the elderly aged 65 years and older in China / 中华流行病学杂志
Chinese Journal of Epidemiology ; (12): 359-365, 2022.
Article in Chinese | WPRIM | ID: wpr-935396
ABSTRACT

Objective:

To explore the effect of sleep duration on the risk of cognitive impairment in the elderly in China.

Methods:

Baseline data of 9 679 elderly individuals with intact cognition were collected from the Chinese Longitudinal Healthy Longevity Survey (CLHLS) in 2005, and followed up was conducted until 2018. Cox proportional hazards model was used to analyze the association between different sleep durations and the risk for cognitive impairment in the elderly.

Results:

Compared with elderly with sleep duration of 6 hours per day, those with sleep duration less than 5 hours had increased risk for cognitive impairment by 30% (HR=1.30, 95%CI 1.05-1.62), and those with sleep durations of 7 hours, 8 hours and more than 9 hours had increased risk for cognitive impairment by 34% (HR=1.34,95%CI 1.09-1.64), 40% (HR=1.40,95%CI 1.17-1.69) and 43% (HR=1.43,95%CI 1.19-1.70), respectively. Trend test showed that the risk of cognitive impairment increased with the extension of sleep duration (>6 h), and there was a dose-response relationship (P<0.001). However, self-rated sleep quality was not associated with the risk for cognitive impairment in the elderly.

Conclusions:

The shorter and longer sleep duration were associated an increased risk of cognitive impairment in the elderly aged ≥65 years in China, suggesting that optimizing sleep duration might delay the occurrence of cognitive impairment.
Subject(s)
Full text: Available Index: WPRIM (Western Pacific) Main subject: Sleep / China / Risk Factors / Cohort Studies / Cognitive Dysfunction Type of study: Etiology study / Incidence study / Observational study / Prognostic study / Risk factors Limits: Aged / Humans Country/Region as subject: Asia Language: Chinese Journal: Chinese Journal of Epidemiology Year: 2022 Type: Article

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Full text: Available Index: WPRIM (Western Pacific) Main subject: Sleep / China / Risk Factors / Cohort Studies / Cognitive Dysfunction Type of study: Etiology study / Incidence study / Observational study / Prognostic study / Risk factors Limits: Aged / Humans Country/Region as subject: Asia Language: Chinese Journal: Chinese Journal of Epidemiology Year: 2022 Type: Article