title: Relation of sleep quality and sleep duration to type 2 diabetes: a population-based cross-sectional survey.
abstract: OBJECTIVE
  To investigate the association between self-reported sleep duration, sleep quality and the prevalence of diabetes in a contemporary sample of Chinese adults.
  
  
  METHODS
  Cross-sectional survey.
  
  
  METHODS
  Community-based investigation in Xuzhou, China.
  
  
  METHODS
  16 893 Chinese men and women aged 18-75 who fulfilled the inclusion and exclusion criteria were enrolled.
  
  
  METHODS
  Self-reported quality and duration of sleep were obtained by questionnaire, and type 2 diabetes was assessed by fasting blood glucose. Sleep quality was categorised as good, common or poor. Sleep duration was measured by average hours of sleep per night, with categories of ≤6 h, 6-8 h and ≥8 h. A logistic regression model was used to evaluate the association between sleep duration or sleep quality and diabetes.
  
  
  RESULTS
  Both poor quality of sleep and short sleep duration (≤6 h) were associated with increased prevalence of diabetes, with higher rates in relatively healthy Chinese people. Compared with the group with good quality of sleep and 6-8 h sleep duration, diabetes was the most prevalent in individuals with poor sleep quality and ≤6 h sleep duration (OR 1.41, 95% CI 1.07 to 1.85) and in those with poor sleep quality who slept ≥8 h (OR 1.39, 95% CI 0.85 to 2.26), even after adjustment for a large number of further possible factors.
  
  
  CONCLUSIONS
  The results suggest that sleep of poor quality and short duration is associated with diabetes.
authors.affiliation: Department of Control and Prevention of Chronic Non-Communicable Diseases, Xuzhou Center for Disease Control and Prevention, Xuzhou, China.
authors.forename: Peian
authors.initials: P
authors.lastname: Lou
authors.forename: Peipei
authors.initials: P
authors.lastname: Chen
authors.forename: Lei
authors.initials: L
authors.lastname: Zhang
authors.forename: Pan
authors.initials: P
authors.lastname: Zhang
authors.forename: Jiaxi
authors.initials: J
authors.lastname: Yu
authors.forename: Ning
authors.initials: N
authors.lastname: Zhang
authors.forename: Hongmin
authors.initials: H
authors.lastname: Wu
authors.forename: Jing
authors.initials: J
authors.lastname: Zhao