Objective: To analyze the association between sleep duration and cognitive function of the elderly in six provinces of China. Methods: Based on the cross-sectional survey data of the elderly from the Healthy Ageing Assessment Cohort Study in 2019, 4 644 participants' sociodemographic and economic indicators, lifestyle, prevalence of major chronic diseases, and sleep status, including night-time sleep duration, daytime sleep duration and insomnia, were collected by questionnaires. Cognitive function was evaluated by the Mini-Mental State Examination. Multivariate logistic regression was used to analyze the association between night-time sleep duration, daytime sleep duration and cognitive function. Results: The mean age of 4 644 respondents was (72.3±5.7) years, and 2 111 of them were males (45.5%). The mean total daily sleep time of the elderly was (7.9±1.9) hours, and the proportion of those who slept less than 7.0, 7.0-8.9 and≥9.0 hours was 24.1% (1 119), 42.1% (1 954) and 33.8% (1 571), respectively. The mean sleep time at night was (6.9±1.7) hours. About 23.7% (1 102) of the elderly did not sleep during the day, and the mean duration of the elderly who slept during the day was (78±51) minutes. Among the elderly with insomnia, 47.9% were still satisfied with their sleep quality. The mean value of MMSE score of 4 644 respondents was (24.5±5.3), and the cognitive impairment rate was 28.3% (1 316). The results of multivariate logistic regression model analysis showed that the OR (95%CI) value of the risk of cognitive impairment in older people who did not sleep, slept for 31 to 60 minutes and slept more than one hour was 1.473 (1.139 to 1.904), 1.277 (1.001 to 1.629) and 1.496 (1.160 to 1.928), respectively, compared with those who slept for 1 to 30 minutes during the daytime. Compared with those who slept for 7.0‒8.9 hours at night, the OR (95%CI) value of the risk of cognitive impairment in older people who slept more than 9.0 hours was 1.239 (1.011 to 1.519). Conclusion: The cognitive function is related to sleep duration in the Chinese elderly.
目的： 分析中国六省老年人睡眠时长与认知功能的关系。 方法： 利用“健康老龄化评估队列研究”的2019年的横断面调查数据，将4 644名符合标准的老年人纳入研究，采用调查问卷收集老年人的社会人口与经济学指标、生活方式、主要慢性病患病情况、睡眠状况（夜间睡眠时长、白天睡眠时长及失眠情况）等信息，采用简易精神状态量表（MMSE）评估老年人认知功能。采用多因素logistic回归模型分析老年人夜间睡眠时长、白天睡眠时长与认知功能的关联。 结果： 4 644名研究对象的年龄为（72.3±5.7）岁；男性2 111名（45.5%）；每日睡眠总时间为（7.9±1.9）h，睡眠不足7.0、7.0~8.9和≥9.0 h者分别占24.1%（1 119 名）、42.1%（1 954 名）和33.8%（1 571名）；夜间平均睡眠时间为（6.9±1.7）h；23.7%（1 102名）的老年人白天不睡觉，白天睡觉的老年人白天睡眠时间为（78±51）min；在存在失眠问题的老年人中，仍有47.9%的人对睡眠质量感到满意。4 644名研究对象MMSE得分为（24.5±5.3）分，认知功能损伤检出率为28.3%（1 316 名）。多因素logistic回归模型分析结果显示，与白天睡眠1~30 min者相比，不睡眠及睡眠时长31~60、≥61 min者出现认知功能障碍风险的OR（95%CI）值分别为1.473（1.139~1.904）、1.277（1.001~1.629）、1.496（1.160~1.928）；与夜间睡眠7.0~8.9 h者相比，睡眠时长超过9.0 h者出现认知功能障碍风险的OR（95%CI）值为1.239（1.011~1.519）。 结论： 中国老年人睡眠时长与认知功能存在关联。.