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  • Title: Short sleep duration and longer daytime napping are associated with non-alcoholic fatty liver disease in Chinese adults.
    Author: Peng K, Lin L, Wang Z, Ding L, Huang Y, Wang P, Xu Y, Lu J, Xu M, Bi Y, Wang W, Chen Y, Ning G.
    Journal: J Diabetes; 2017 Sep; 9(9):827-836. PubMed ID: 27701849.
    Abstract:
    BACKGROUND: Epidemiologic studies have reported conflicting results on the relationship between short sleep duration and non-alcoholic fatty liver disease (NAFLD). There are no previous studies investigating the effect of daytime napping on NAFLD. In the present study we examined the associations between NAFLD and both nightly sleep duration and daytime napping in a middle-aged and elderly Chinese population. METHODS: This cross-sectional community-based population study was performed on 8559 individuals aged ≥40 years. Sleep duration and the duration of daytime napping were self-reported using a standardized questionnaire; NAFLD was diagnosed by ultrasonography. RESULTS: In this study sample, the overall prevalence of NAFLD was 30.4%. There was an inverse association between sleep duration and the risk of prevalent NAFLD. In multivariate analysis, the odds ratios (ORs) and 95% confidence intervals (CIs) of prevalent NAFLD for decreasing sleep duration categories (≥9, 8.1-9, 7.1-8, 6.1-7, and ≤6.1 h) were 1.00 (reference), 1.38 (1.13-1.70), 1.32 (1.08-1.61), 1.29 (1.04-1.60), and 1.66 (1.28-2.15), respectively (P trend  = 0.0073). Compared with participants without a daytime napping habit, nap takers with a longer nap duration (>0.5 h) had an increased risk of prevalent NAFLD (OR 1.22; 95% CI 1.06-1.41). The associations of sleep duration and daytime napping duration with NAFLD were generally consistent across different categories of age and obesity, metabolic syndrome, and insulin resistance status. CONCLUSIONS: Short sleep duration and longer daytime napping were associated with an increased risk of prevalent NAFLD in a middle-aged and elderly Chinese population.
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