title: Sleep duration and hyperglycemia among obese and nonobese children aged 3 to 6 years.
abstract: OBJECTIVE
  To investigate the association between sleep duration and risk of hyperglycemia among preschool Chinese children.
  
  
  METHODS
  A population-based cross-sectional study.
  
  
  METHODS
  Seventy-one randomly selected kindergartens in Tianjin, China.
  
  
  METHODS
  Six hundred nineteen obese (body mass index z score > or =1.65) and 617 nonobese (body mass index z score <1.65) children aged 3 to 6 years were recruited and matched by age. Main Exposure Sleep duration.
  
  
  METHODS
  Hyperglycemia, defined as a fasting glucose level of 100 mg/dL or higher.
  
  
  RESULTS
  Obese children were more likely to have shorter sleep duration (< or =8 hours) compared with their nonobese counterparts (P < .001). Compared with those who slept for 9 or 10 hours per night, those who slept for 8 hours or less had a significantly higher likelihood of having hyperglycemia, controlling for age and sex (odds ratio [OR], 1.65; 95% confidence interval [CI], 1.12-2.45). After further adjustment for other potential confounders, the association still remained statistically significant (OR, 1.64; 95% CI, 1.09-2.46). In the stratified multivariable analyses, those who were obese and slept for 8 hours or less had an increased risk of having hyperglycemia (OR, 2.12; 95% CI, 1.06-4.21) compared with those who were nonobese and slept for 9 hours or more.
  
  
  CONCLUSIONS
  Shorter sleep duration is associated with an increased risk of having hyperglycemia among preschool Chinese children. Whether adequate sleep may help maintain euglycemia among children, especially for those who are overweight or obese, warrants further investigation.
authors.affiliation: Tianjin Women and Children's Health Center, Tianjin, China.
authors.forename: Zhen
authors.initials: Z
authors.lastname: Tian
authors.forename: Tao
authors.initials: T
authors.lastname: Ye
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Zhang
authors.forename: Enqing
authors.initials: E
authors.lastname: Liu
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
authors.forename: Ping
authors.initials: P
authors.lastname: Wang
authors.forename: Gongshu
authors.initials: G
authors.lastname: Liu
authors.forename: Xilin
authors.initials: X
authors.lastname: Yang
authors.forename: Gang
authors.initials: G
authors.lastname: Hu
authors.forename: Zhijie
authors.initials: Z
authors.lastname: Yu
mesh_terms: D001786:Blood Glucose / Q000032:analysis; D002648:Child; D002675:Child, Preschool; D002681:China / Q000453:epidemiology; D003430:Cross-Sectional Studies; D004032:Diet; D005260:Female; D006801:Humans; D006943:Hyperglycemia / Q000453:epidemiology*; D016014:Linear Models; D016015:Logistic Models; D008297:Male; D009765:Obesity / Q000097:blood / Q000453:epidemiology; D016017:Odds Ratio; D012890:Sleep / Q000502:physiology*; D013690:Television / Q000706:statistics & numerical data; D013997:Time Factors
chemical_list: D001786:Blood Glucose