title: Self-reported long total sleep duration is associated with metabolic syndrome: the Guangzhou Biobank Cohort Study.
abstract: OBJECTIVE
  To examine the association between total sleep duration and the prevalence of metabolic syndrome (MetSyn) in older Chinese.
  
  
  METHODS
  Cross-sectional analysis of baseline data from the Guangzhou Biobank Cohort Study (GBCS) was performed. Participants (n = 29,333) were aged ≥50 years. Risk of MetSyn and its components were identified for self-reported total sleep duration.
  
  
  RESULTS
  Participants reporting long (≥9 h) and short (<6 h) total sleep duration had increased odds ratio (OR) of 1.18 (95% CI 1.07-1.30) and 1.14 (1.05-1.24) for the presence of MetSyn, respectively. The relationship remained in long sleepers (OR 1.21 [1.10-1.34]) but diminished in short sleepers (0.97 [0.88-1.06]) after full adjustment.
  
  
  CONCLUSIONS
  Long sleep duration was associated with greater risk of MetSyn in older Chinese. Confirmation through longitudinal studies is needed. The mechanisms mediating the link between long sleep duration and MetSyn require further investigation.
authors.affiliation: Birmingham and Black Country National Institute for Health Research Collaborations for Leadership in Applied Health Research and Care, University of Birmingham, Birmingham, UK.
authors.forename: Teresa
authors.initials: T
authors.lastname: Arora
authors.forename: Chao Qiang
authors.initials: CQ
authors.lastname: Jiang
authors.forename: G Neil
authors.initials: GN
authors.lastname: Thomas
authors.forename: Kin-bong Hubert
authors.initials: KB
authors.lastname: Lam
authors.forename: Wei Sen
authors.initials: WS
authors.lastname: Zhang
authors.forename: Kar Keung
authors.initials: KK
authors.lastname: Cheng
authors.forename: Tai Hing
authors.initials: TH
authors.lastname: Lam
authors.forename: Shahrad
authors.initials: S
authors.lastname: Taheri
mesh_terms: D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D044466:Asian People; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D024821:Metabolic Syndrome / Q000453:epidemiology*; D008875:Middle Aged; D016017:Odds Ratio; D057566:Self Report; D012890:Sleep / Q000502:physiology*