title: Lifestyle factors associated with childhood obesity: a cross-sectional study in Shanghai, China.
abstract: BACKGROUND
  Limited research has been conducted to investigate factors associated with overweight and obesity of children in China, where obesity has been increasing. This study investigated associations of lifestyle factors with overweight or obesity among Chinese primary school-aged children.
  
  
  METHODS
  A cross-sectional survey was conducted with 2400 children aged 6-12 from 11 primary schools. Children completed a self-administered questionnaire assisted by their parents at home. The survey included questions on self-reported height and weight, screen time, physical activity, modes of travel to/from school, and dietary habits. Multilevel models were conducted to examine factors associated with overweight or obesity.
  
  
  RESULTS
  15.6% of children were overweight and 11.2% were obese; nearly 80% of children spent ≤2 hrs./day either on physical activities or screen time. Compared with those spent >3 hrs./day on screen time, children who spent ≤2 hrs./day or between 2-3 hrs./day were significantly less likely to be obese after adjusting for other variables (AOR = 0.34, 95% CI: 0.20-0.60, P < 0.01; or AOR = 0.41, 95% CI: 0.20-0.84, P = 0.02 respectively). Children spent ≤2 hrs./day on screen time were less likely to become overweight or obesity, compared with >3 hrs./day (AOR = 0.62, 95% CI: 0.38-0.99, P < 0.05).
  
  
  CONCLUSIONS
  Screen time is independently associated with childhood obesity, and needs be focused for obesity prevention in school-aged children in China.
authors.affiliation: Department of Nutrition and Food Hygiene, School of Public Health, Key Laboratory of Public Health Safety, Ministry of Education, Fudan University, Shanghai, People's Republic of China. 11211020025@fudan.edu.cn.
authors.forename: Liangli
authors.initials: L
authors.lastname: Li
authors.affiliation: Department of Nutrition and Food Hygiene, School of Public Health, Key Laboratory of Public Health Safety, Ministry of Education, Fudan University, Shanghai, People's Republic of China. 11211020070@fudan.edu.cn.
authors.forename: Tingting
authors.initials: T
authors.lastname: Shen
authors.affiliation: School of Public Health, University of Sydney, Sydney, Australia. lmwen@email.cs.nsw.gov.au.|Health Promotion Service, Sydney Local Health District, Sydney, NSW, Australia. lmwen@email.cs.nsw.gov.au.
authors.forename: Li Ming
authors.initials: LM
authors.lastname: Wen
authors.affiliation: Department of Nutrition and Food Hygiene, School of Public Health, Key Laboratory of Public Health Safety, Ministry of Education, Fudan University, Shanghai, People's Republic of China. wumin@shmu.edu.cn.
authors.forename: Min
authors.initials: M
authors.lastname: Wu
authors.affiliation: Department of Nutrition and Food Hygiene, School of Public Health, Key Laboratory of Public Health Safety, Ministry of Education, Fudan University, Shanghai, People's Republic of China. 082102115@fudan.edu.cn.
authors.forename: Ping
authors.initials: P
authors.lastname: He
authors.affiliation: Department of Social and Preventive Medicine, School of Public Health and Health Professions, Joint Appointments, School of Medicine and Biomedical Sciences, University at Buffalo, State University of New York (SUNY), New York, USA. youfawan@buffalo.edu.
authors.forename: Youfa
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Department of Environmental Health, School of Public Health, Key Laboratory of Public Health Safety, Ministry of Education, Fudan University, Shanghai, People's Republic of China. wdqu@fudan.edu.cn.
authors.forename: Weidong
authors.initials: W
authors.lastname: Qu
authors.affiliation: Department of Maternal, Child and Adolescence Health, School of Public Health, Key laboratory of Public Health Safety, Ministry of Education, Fudan University, Shanghai, People's Republic of China. htan@fudan.edu.cn.
authors.forename: Hui
authors.initials: H
authors.lastname: Tan
authors.affiliation: Department of Nutrition and Food Hygiene, School of Public Health, Key Laboratory of Public Health Safety, Ministry of Education, Fudan University, Shanghai, People's Republic of China. gshe@shmu.edu.cn.
authors.forename: Gengsheng
authors.initials: G
authors.lastname: He
mesh_terms: D001835:Body Weight; D002648:Child; D002681:China / Q000453:epidemiology; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008019:Life Style; D008297:Male; D008954:Models, Biological; D063766:Pediatric Obesity / Q000453:epidemiology*