title: Sedentary behavior during school-time: Sociodemographic, weight status, physical education class, and school performance correlates in Brazilian schoolchildren.
abstract: OBJECTIVE
  To investigate whether sedentary behavior during school-time is associated with gender, age, mother's education, having physical education classes, weight status, and academic performance.
  
  
  METHODS
  Cross-sectional study.
  
  
  METHODS
  A sample of 571 children (7-12 years old) from five elementary schools in Florianopolis, South Brazil had their height and weight measured, and wore accelerometers during class time. Teachers completed a form to evaluate children's reading and writing skills. Parents provided sociodemographic and educational information. Data was analyzed using multilevel linear regression analyses.
  
  
  RESULTS
  Children spent an average of 132min in sedentary behavior during school-time (64% of total school-time). Girls (137.5min), obese children (138.1min), older children (144.2min), and those who did not have physical education classes (140.2min) spent more time engaged in sedentary activities than their peers. Academic performance and mother's education were not associated with sedentary behaviors.
  
  
  CONCLUSIONS
  Children spent most of their school-time in sedentary activities, with girls, older students, and obese students being even more sedentary than their peers. Physical education classes were a protective factor against excessive sedentary behavior in school. Interventions for reducing sedentary behavior during school-time could employ additional strategies to benefit the at risk groups. In addition, encouraging student's participation in physical education classes could minimize the time spent in sedentary behavior during school hours.
authors.affiliation: Research Center in Physical Activity and Health, Brazil. Electronic address: profbrunogcosta@gmail.com.
authors.forename: Bruno G G
authors.initials: BG
authors.lastname: da Costa
authors.affiliation: Research Center in Physical Activity and Health, Brazil; Federal University of Santa Catarina, Brazil.
authors.forename: Kelly S
authors.initials: KS
authors.lastname: da Silva
authors.affiliation: Memorial University of Newfoundland, Canada.
authors.forename: Amanda M
authors.initials: AM
authors.lastname: George
authors.affiliation: Research Center in Physical Activity and Health, Brazil; Federal University of Santa Catarina, Brazil.
authors.forename: Maria Alice A
authors.initials: MA
authors.lastname: de Assis
mesh_terms: D001835:Body Weight; D001938:Brazil; D002648:Child; D003430:Cross-Sectional Studies; D015444:Exercise; D005260:Female; D006801:Humans; D008297:Male; D009035:Mothers; D010806:Physical Education and Training / Q000706:statistics & numerical data*; D012044:Regression Analysis; D012574:Schools; D057185:Sedentary Behavior; D012737:Sex Factors; D012923:Social Class; D013334:Students
keywords: Accelerometer; Child behavior; Children; Public health; Students