title: [Familial clustering of obesity and the role of lifestyle factors among children in Beijing].
abstract: OBJECTIVE
  To investigate the correlation between lifestyle factors, parental obesity and adiposity in children, in order to provide theoretical evidence for public health policy establishment.
  
  
  METHODS
  A cross-sectional observation study was conducted among approximately 20 thousand children aged 2 - 18 years old in urban and rural regions of Beijing, by using stratified randomization clustering sampling methods. Familial environmental risk factors of children adiposity and parental obesity were assessed with standardized questionnaire. Anthropometric measurements, including height and weight, were conducted. SPSS 13.0 software was applied to analyze the data, including general description, chi(2) trend test and non-condition logistic analyse.
  
  
  RESULTS
  With IOTF obesity references, the prevalence of obesity in 21,198 children aged 2 - 18 years old was 5.6%. The behavioral characters (for example, smoking and drinking) and children obesity showed significant familial aggregation. In groups including "both parents not smoke", "only one parent smoke" and "both parents smoke", the smoking rates of offsprings were 1.50%, 2.93% and 6.01%, respectively (chi(trend)(2) = 107.009, P < 0.01). A similar pattern was found for offsprings' alcohol consumption rates (5.85%, 9.12% and 13.96%; chi(trend)(2) = 107.009, P < 0.01). Based on parents' BMI status, in groups including "both parents had normal weight", "father was obese", "mother was obese" and "both parents were obese", the prevalence of obesity in children were 3.29%, 11.48%, 9.12% and 27.01%, respectively (chi(trend)(2) = 293.404, P < 0.01). After controlling for sex and ages, factors such as physical exercises, sleeping times per day, fat intakes, watching TV, drinking alcohol were impact factors of children obesity. After controlling of confounding factors, such as children gender, age, birth weight, puberty, smoking history, drinking history, fat intakes, soft drink, physical exercises, education experiences of parents, smoking history, drinking history, family income and so on, maternal obesity had a greater influence on daughters than on sons (OR = 5.93, 95% CI: 3.57 - 9.84), and paternal obesity showed similar influence on sons (OR = 4.29, 95% CI: 3.21 - 5.72). Comparing to parents with normal weight, obese parents had more powerful impact on daughters (OR = 28.51, 95% CI: 15.13 - 53.72) than on sons (OR = 7.21, 95% CI: 4.07 - 12.75), regarding to 2 - 5 years group and 10 - 12 years group versus other age group (OR = 18.67, 95% CI: 1.49 - 234.46; OR = 22.25, 95% CI: 10.62 - 46.59).
  
  
  CONCLUSIONS
  Parental obesity is an independent risk factor of adiposity in children; gender and age affect this association. The lifestyle patterns of parents should have great impact on children. When prevention or intervention with children obesity, familial environmental factors should be emphasized.
authors.affiliation: Department of Epidemiology, Capital Institute of Pediatrics, Beijing, China.
authors.forename: Bo
authors.initials: B
authors.lastname: Xi
authors.forename: Jie
authors.initials: J
authors.lastname: Mi
authors.forename: Jia-li
authors.initials: JL
authors.lastname: Duan
authors.forename: Shu-juan
authors.initials: SJ
authors.lastname: Yan
authors.forename: Hong
authors.initials: H
authors.lastname: Cheng
authors.forename: Dong-qing
authors.initials: DQ
authors.lastname: Hou
authors.forename: Xiao-yuan
authors.initials: XY
authors.lastname: Zhao
mesh_terms: D000293:Adolescent; D000428:Alcohol Drinking; D002648:Child; D002675:Child, Preschool; D002681:China / Q000453:epidemiology; D003430:Cross-Sectional Studies; D005191:Family Characteristics; D005260:Female; D006801:Humans; D008019:Life Style; D008297:Male; D009765:Obesity / Q000453:epidemiology* / Q000517:prevention & control*; D010290:Parents; D015995:Prevalence; D012307:Risk Factors; D012494:Sampling Studies; D012907:Smoking; D011795:Surveys and Questionnaires