title: [Prevalence of sedentary behavior and its correlates among primary and secondary school students].
abstract: OBJECTIVE
  To determine the students' exposure to four different sedentary behavior (SB) indi-cators and their associations with gender, grade, age, economic status and physical activity level.
  
  
  METHODS
  A cross-sectional study was conducted in 2013. The SB was collected using the HELENA instrument, composed by screen time questions (TV, video games and internet) and sitting activ-ities on school opposite shift. The cut point of ≥2h/day was used to categorize the outcome. The Poisson regression was used for associations between the outcome and the independent variables (95% significance level), controlling for confounding variables and the possible design effect.
  
  
  RESULTS
  The sample was composed by 8661 students. The overall prevalence of SB was 69.2% (CI95% 68.1-70.2) on weekdays, and 79.6% (CI95% 78.7-80.5) on weekends. Females were more associated with the outcome, except to electronic games. Advanced grades students were more involved in sitting tasks when compared to the early grades. Older students were more likely to surf on net for ≥2h/day. Higher economic level students were more likely to engage in video games and internet. Active individuals were less likely to engage in SB on weekdays.
  
  
  CONCLUSIONS
  The prevalence of SB was high, mainly on weekends. The associations with sex, age, grade and physical activity level should be considered into elaboration of more efficient interventions on SB control.
authors.affiliation: Programa de Pós-Graduação em Educação Física, Universidade Federal de Pelotas (Ufpel), Pelotas, RS, Brasil. Electronic address: wiltgenrodrigo@gmail.com.
authors.forename: Rodrigo Wiltgen
authors.initials: RW
authors.lastname: Ferreira
authors.affiliation: Programa de Pós-Graduação em Educação Física, Universidade Federal de Pelotas (Ufpel), Pelotas, RS, Brasil.
authors.forename: Airton José
authors.initials: AJ
authors.lastname: Rombaldi
authors.affiliation: Programa de Pós-Graduação em Epidemiologia, Universidade Federal de Pelotas (Ufpel), Pelotas, RS, Brasil.
authors.forename: Luiza Isnardi Cardoso
authors.initials: LI
authors.lastname: Ricardo
authors.affiliation: Programa de Pós-Graduação em Educação Física, Universidade Federal de Pelotas (Ufpel), Pelotas, RS, Brasil; Programa de Pós-Graduação em Epidemiologia, Universidade Federal de Pelotas (Ufpel), Pelotas, RS, Brasil.
authors.forename: Pedro Curi
authors.initials: PC
authors.lastname: Hallal
authors.affiliation: Programa de Pós-Graduação em Educação Física, Universidade Federal de Pelotas (Ufpel), Pelotas, RS, Brasil.
authors.forename: Mario Renato
authors.initials: MR
authors.lastname: Azevedo
mesh_terms: D000293:Adolescent; D000367:Age Factors; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008297:Male; D016012:Poisson Distribution; D015995:Prevalence; D057185:Sedentary Behavior; D012737:Sex Factors; D013334:Students / Q000523:psychology / Q000706:statistics & numerical data*; D013690:Television / Q000706:statistics & numerical data; D018910:Video Games / Q000706:statistics & numerical data
keywords: Adolescent behavior; Adolescentes; Adolescents; Comportamento do adolescente; Estilo de vida sedentário; Internet; Sedentary lifestyle; Television; Televisão
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