title: Predictors and health consequences of screen-time change during adolescence--1993 Pelotas (Brazil) birth cohort study.
abstract: OBJECTIVE
  To investigate screen-time change from early to mid adolescence, its predictors, and its influence on body fat, blood pressure, and leisure-time physical activity.
  
  
  METHODS
  We used data from a longitudinal prospective study, conducted among participants of the 1993 Pelotas (Brazil) Birth Cohort Study. At baseline, adolescents were, on average, 11 years old. They were later visited at age 15 years. Screen time was self-reported, accounting for the time spent watching television, playing video games, and using the computer. Several predictors were examined. The effect of screen-time change on some health outcomes was also analyzed.
  
  
  RESULTS
  Screen time increased on average 60 min/d from 11 to 15 years of age, for the 4,218 adolescents studied. The groups that presented the highest increases in screen time were male, wealthiest, those whose mothers had higher education, and adolescents with a history of school failure. There were positive associations between screen-time change and body mass index, skinfold thickness, waist circumference, and leisure-time physical activity at 15 years of age.
  
  
  CONCLUSIONS
  Screen time increased from early to mid adolescence. This increment was higher among boys and the wealthiest adolescents. Increases in screen time affected body composition, with negative implications on adiposity.
authors.affiliation: Department of Population and Health, Federal University of Rio Grande, Rio Grande, Brazil. scdumith@yahoo.com.br
authors.forename: Samuel Carvalho
authors.initials: SC
authors.lastname: Dumith
authors.forename: Leandro Martin Totaro
authors.initials: LM
authors.lastname: Garcia
authors.forename: Kelly Samara
authors.initials: KS
authors.lastname: da Silva
authors.forename: Ana Maria Baptista
authors.initials: AM
authors.lastname: Menezes
authors.forename: Pedro Curi
authors.initials: PC
authors.lastname: Hallal
mesh_terms: D050154:Adiposity; D000293:Adolescent; D000294:Adolescent Behavior; D001794:Blood Pressure; D001823:Body Composition; D001938:Brazil / Q000453:epidemiology; D002648:Child; D015331:Cohort Studies; D004522:Educational Status; D005260:Female; D006801:Humans; D007182:Income; D007899:Leisure Activities; D008297:Male; D057185:Sedentary Behavior; D012737:Sex Factors; D013690:Television; D013997:Time Factors; D014584:User-Computer Interface; D018910:Video Games