title: Prevalence and factors associated with sedentary behavior in adolescents.
abstract: OBJECTIVE
  To analyze the prevalence of sedentary behavior and associated factors in adolescents.
  
  
  METHODS
  A cross-sectional study with adolescents aged 10 to 17 years, of both sexes, belonging to a 1994-1999 birth cohort in the city of Cuiabá, MT, Central Western Brazil. Data were collected using a questionnaire containing sociodemographic, economic, lifestyle and anthropometric variables. Sedentary behavior was determined as using television and/or computer/video games for a time greater than or equal to 4 hours/day. Associations with sedentary behavior were evaluated using body mass index in childhood and adolescence and sociodemographic and behavioral variables using hierarchical logistic regression.
  
  
  RESULTS
  The overall prevalence of sedentary behavior was 58.1%. Of the 1,716 adolescents evaluated, 50.7% (n = 870) were male. In multivariate analysis, after adjustment for confounding factors, the variables that remained associated with sedentary behavior were: age (14 and over) (OR = 3.51, 95%CI 2.19;5.60); higher socioeconomic class (OR = 3.83, 95%CI 2.10;7.01), higher level of maternal education (OR = 1.81, 95%CI 1.09;3.01); living in the country (OR = 0.49, 95%CI 0.30;0.81); insufficient physical activity (OR = 1.25, 95%CI 1.02;1.53); experimentation with alcoholic beverages (OR = 1.34, 95%CI 1.08;1.66) and being overweight in adolescence (OR = 1.33, 95%CI 1.06;1.68).
  
  
  CONCLUSIONS
  The high proportion of adolescents in sedentary activities and the lack of association with being overweight in childhood, indicates the need for educational initiatives to reduce multiple risk behaviors. Encouraging physical activity in young people as a way of reducing sedentary behavior and, consequently, being overweight is fundamental.
authors.affiliation: Universidade Federal de Mato Grosso, Cuiabá, MT, Brasil.
authors.forename: Paula Jaudy Pedroso
authors.initials: PJ
authors.lastname: Dias
authors.affiliation: Universidade Federal de Mato Grosso, Cuiabá, MT, Brasil.
authors.forename: Isabela Prado
authors.initials: IP
authors.lastname: Domingos
authors.affiliation: Universidade Federal de Mato Grosso, Cuiabá, MT, Brasil.
authors.forename: Márcia Gonçalves
authors.initials: MG
authors.lastname: Ferreira
authors.affiliation: Instituto de Saúde Coletiva, Departamento de Saúde Coletiva, Universidade Federal de Mato Grosso, Cuiabá, MT, Brasil.
authors.forename: Ana Paula
authors.initials: AP
authors.lastname: Muraro
authors.affiliation: Departamento de Epidemiologia, Instituto de Medicina Social, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, RJ, Brasil.
authors.forename: Rosely
authors.initials: R
authors.lastname: Sichieri
authors.affiliation: Universidade Federal de Mato Grosso, Cuiabá, MT, Brasil.
authors.forename: Regina Maria Veras
authors.initials: RM
authors.lastname: Gonçalves-Silva
mesh_terms: D000293:Adolescent; D000367:Age Factors; D015992:Body Mass Index; D001938:Brazil / Q000453:epidemiology; D002648:Child; D003430:Cross-Sectional Studies; D005260:Female; D015438:Health Behavior; D006801:Humans; D008297:Male; D009043:Motor Activity; D050177:Overweight / Q000453:epidemiology / Q000209:etiology*; D015995:Prevalence; D012307:Risk Factors; D057185:Sedentary Behavior; D012737:Sex Factors; D012959:Socioeconomic Factors; D013690:Television