title: Poor sleep quality associated with obesity in men.
abstract: OBJECTIVE
  The objective of this study is to examine the association between sleep quality and obesity status.
  
  
  METHODS
  A cross-sectional study of 3225 Chinese participants aged 18 to 65 years was conducted in Beijing in 2007. Body mass index (BMI) was classified according to the Working Group on Obesity in China, and sleep quality was assessed by the modified Pittsburg Sleep Quality Index questionnaire. Logistic regression models were applied to estimate the odds ratios (OR) and 95 % CIs of obesity by sleep quality adjusted for potential confounders. Two sets of potential confounders were used in the adjusted models. Model 1 was adjusted for sex and age. Model 2 was further adjusted for education level, occupation, marriage status, smoking, alcohol consumption, body pain, and health status.
  
  
  RESULTS
  Poor sleep quality was significantly negatively associated with overweight/obesity in men but not in women. Additional adjustment for education level, occupation, marriage status, smoking, alcohol consumption, body pain, and health status did not attenuate the association (OR = 1.41 with 95 % CI 1.03-1.93; P < 0.05) among men. The adjusted OR per sleep quality score hour was 1.07 (1.01-1.14) for overweight/obesity, suggesting that for one score increase in sleep quality, obesity/overweight risk increased by 7 % in men.
  
  
  CONCLUSIONS
  Sleep quality was negatively associated with overweight/obesity in Chinese men but not in women.
authors.affiliation: School of Food Science, Guangdong Pharmaceutical University, Zhongshan, 528458, China.|School of Public Health and Tropical Medicine, Tulane University, New Orleans, LA, 70112, USA.
authors.forename: Wenjie
authors.initials: W
authors.lastname: Sun
authors.affiliation: Ningxia Autonomous Region Department of Public Health, Yinchuan, Ningxia, 750001, China.
authors.forename: Jingqin
authors.initials: J
authors.lastname: Yuan
authors.affiliation: Department of Epidemiology, School of Public Health, Jilin University, Changchun, 130021, China.
authors.forename: Yaqin
authors.initials: Y
authors.lastname: Yu
authors.affiliation: Department of Epidemiology and Health Statistics, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
authors.forename: Zengzhen
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Saw Swee Hock School of Public Health, National University of Singapore, Singapore, Singapore.
authors.forename: Nivedita
authors.initials: N
authors.lastname: Shankar
authors.affiliation: School of Medicine, Tulane University, New Orleans, LA, 70112, USA.
authors.forename: Gholam
authors.initials: G
authors.lastname: Ali
authors.affiliation: Payer and Provider Research HealthCore Inc., Wilmington, DE, 19801, USA.
authors.forename: Yiqiong
authors.initials: Y
authors.lastname: Xie
authors.affiliation: School of Public Health and Jiangsu Key Laboratory of Preventive and Translational Medicine for Geriatric Diseases, Medical College of Soochow University, Suzhou, China. xutan@suda.edu.cn.
authors.forename: Tan
authors.initials: T
authors.lastname: Xu
authors.affiliation: Department of Epidemiology and Statistics, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences; School of Basic Medicine, Peking Union Medical College, Beijing, 100005, China. guangliang_shan@hotmail.com.
authors.forename: Guangliang
authors.initials: G
authors.lastname: Shan
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D015992:Body Mass Index; D002681:China; D003430:Cross-Sectional Studies; D015438:Health Behavior; D006801:Humans; D008297:Male; D008875:Middle Aged; D009765:Obesity / Q000453:epidemiology*; D016017:Odds Ratio; D012893:Sleep Wake Disorders / Q000453:epidemiology*; D011795:Surveys and Questionnaires; D055815:Young Adult
keywords: Chinese; Obesity; Population-based; Sleep quality