title: Association of obesity with physical activity, television programs and other forms of video viewing among children in Mexico city.
abstract: OBJECTIVE
  To assess the association of physical activity, television program viewing and other forms of video viewing with the prevalence of obesity among school children.
  
  
  METHODS
  Cross-sectional study.
  
  
  METHODS
  712 children, 9-16 y old, from a low- and a middle-income town in the Mexico City area.
  
  
  METHODS
  Children completed a self administered questionnaire to assess time spent in physical activity and television viewing, and diet. Height weight and triceps skinfolds were measured. The outcome variable was obesity, and the covariates were hours of television programs and other video viewing, physical activity, energy intake, percentage of energy from fat, town of location of school, age, gender and perception of mother's weight status.
  
  
  RESULTS
  Among 461 children with complete information, 24% were classified as obese. Children reported an average of 4.1 +/- 2.2 h/d watching television (2.4 +/- 1.5 h/d for TV programs and 1.7 +/- 1.5 h/d for video cassette recorder (VCR) or videogames), and 1.8 +/- 1.3 h/d in moderate and vigorous physical activities. Odds ratios (OR) of obesity were 12% higher for each hour of television program viewing per day (OR = 1.12, 95% confidence interval (CI) 1.02,-1.22), and 10% lower for each hour of moderate/vigorous physical activity per day (OR = 0.90, 95% CI 0.83-0.98), controlling for age, gender, town and perception of mother's weight status. Children in the middle-income town had higher adjusted odds of obesity (OR = 2.58, 95% CI 1.47-4.54).
  
  
  CONCLUSIONS
  Physical activity and television viewing, but not VCR/videogames use, were related to obesity prevalence in Mexican children 9-16 y old.
authors.affiliation: Division of Nutrition and Health, National Institute of Public Health, Mexico. bhernand@insp3.insp.mx
authors.forename: B
authors.initials: B
authors.lastname: Hernández
authors.forename: S L
authors.initials: SL
authors.lastname: Gortmaker
authors.forename: G A
authors.initials: GA
authors.lastname: Colditz
authors.forename: K E
authors.initials: KE
authors.lastname: Peterson
authors.forename: N M
authors.initials: NM
authors.lastname: Laird
authors.forename: S
authors.initials: S
authors.lastname: Parra-Cabrera
mesh_terms: D000293:Adolescent; D002648:Child; D003430:Cross-Sectional Studies; D015444:Exercise; D005260:Female; D006801:Humans; D008297:Male; D008800:Mexico / Q000453:epidemiology; D009765:Obesity / Q000453:epidemiology*; D016017:Odds Ratio; D011203:Poverty; D015995:Prevalence; D011795:Surveys and Questionnaires; D013690:Television