title: Associations between parent-reported sleep duration and adiposity in Chinese early adolescents.
abstract: BACKGROUND
  Short sleep duration has recently been found to be associated with obesity in children, but findings involving adolescents have been less consistent, and some have mentioned gender differences.
  
  
  OBJECTIVE
  To investigate the association between parent-reported sleep duration and adiposity in early adolescence (10-12 years old) and to explore gender differences within this population.
  
  
  METHODS
  Participants were 1309 fifth-grade students (685 boys) from 10 primary schools in Shanghai, China. Body mass index (BMI), waist-height ratio (WHeR) and body fat percentage (BF%) were assessed. Sleep and other potential contributors were recorded by parents or self-reported.
  
  
  RESULTS
  Compared with adolescents in the longest sleep group (greater than or equal to +1 SD, ≥10.05 h), those in the shortest sleep group (less than -1 SD, <8.89 h) had significantly higher BMI, WHeR and BF%. Sleep was found to be closely related to increased adiposity in girls who were in the shortest and shorter sleep group (<mean, <9.45 h). No association was found in boys.
  
  
  CONCLUSIONS
  Short sleep duration was associated with higher adiposity indices in early adolescents from China, especially in girls. Interventions focusing on modifying adolescents' sleep habits may potentially prevent obesity and overweight.
authors.affiliation: Department of Developmental and Behavioral Pediatrics, Shanghai Children's Medical Center Affiliated with Shanghai Jiaotong University School of Medicine, Shanghai, China Ministry of Education-Shanghai Key Laboratory of Children's Environmental Health, Shanghai, China.
authors.forename: Y R
authors.initials: YR
authors.lastname: Jiang
authors.affiliation: Department of Developmental and Behavioral Pediatrics, Shanghai Children's Medical Center Affiliated with Shanghai Jiaotong University School of Medicine, Shanghai, China.
authors.forename: K
authors.initials: K
authors.lastname: Spruyt
authors.affiliation: Department of Developmental and Behavioral Pediatrics, Shanghai Children's Medical Center Affiliated with Shanghai Jiaotong University School of Medicine, Shanghai, China Ministry of Education-Shanghai Key Laboratory of Children's Environmental Health, Shanghai, China.
authors.forename: W J
authors.initials: WJ
authors.lastname: Chen
authors.affiliation: Department of Developmental and Behavioral Pediatrics, Shanghai Children's Medical Center Affiliated with Shanghai Jiaotong University School of Medicine, Shanghai, China Department of Medicine, Center of Biostatistics and Bioinformatics, University of Mississippi Medical Center, Jackson, USA.
authors.forename: H
authors.initials: H
authors.lastname: Mei
authors.affiliation: Department of Developmental and Behavioral Pediatrics, Shanghai Children's Medical Center Affiliated with Shanghai Jiaotong University School of Medicine, Shanghai, China Ministry of Education-Shanghai Key Laboratory of Children's Environmental Health, Shanghai, China.
authors.forename: W Q
authors.initials: WQ
authors.lastname: Sun
authors.affiliation: Department of Developmental and Behavioral Pediatrics, Shanghai Children's Medical Center Affiliated with Shanghai Jiaotong University School of Medicine, Shanghai, China Ministry of Education-Shanghai Key Laboratory of Children's Environmental Health, Shanghai, China.
authors.forename: Y
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Ministry of Education-Shanghai Key Laboratory of Children's Environmental Health, Shanghai, China Shanghai Institute for Pediatric Research, Xinhua Hospital Affiliated with Shanghai Jiaotong University School of Medicine, Shanghai, China.
authors.forename: S H
authors.initials: SH
authors.lastname: Li
authors.affiliation: Ministry of Education-Shanghai Key Laboratory of Children's Environmental Health, Shanghai, China.
authors.forename: Z C
authors.initials: ZC
authors.lastname: Luo
authors.affiliation: Ministry of Education-Shanghai Key Laboratory of Children's Environmental Health, Shanghai, China Shanghai Institute for Pediatric Research, Xinhua Hospital Affiliated with Shanghai Jiaotong University School of Medicine, Shanghai, China.
authors.forename: X M
authors.initials: XM
authors.lastname: Shen
authors.affiliation: Department of Developmental and Behavioral Pediatrics, Shanghai Children's Medical Center Affiliated with Shanghai Jiaotong University School of Medicine, Shanghai, China Ministry of Education-Shanghai Key Laboratory of Children's Environmental Health, Shanghai, China.
authors.forename: F
authors.initials: F
authors.lastname: Jiang
mesh_terms: D000886:Anthropometry; D015992:Body Mass Index; D002648:Child; D002681:China / Q000453:epidemiology; D005260:Female; D006801:Humans; D008297:Male; D009765:Obesity / Q000453:epidemiology*; D050177:Overweight / Q000453:epidemiology*; D010290:Parents; D012307:Risk Factors; D012890:Sleep; D011795:Surveys and Questionnaires
keywords: adiposity; adolescents; environmental factors; sex difference; sleep