title: Trends in screen time on week and weekend days in a representative sample of Southern Brazil students.
abstract: BACKGROUND
  Economic and technological improvements can help increase screen time use among adolescents, but evidence in developing countries is scarce. The aim of this study was to examine changes in TV watching and computer/video game use patterns on week and weekend days after a decade (2001 and 2011), among students in Santa Catarina, southern Brazil.
  
  
  METHODS
  A comparative analysis of two cross-sectional surveys that included 5 028 and 6 529 students in 2001 and 2011, respectively, aged 15-19 years. The screen time use indicators were self-reported. 95% Confidence intervals were used to compare the prevalence rates. All analyses were separated by gender.
  
  
  RESULTS
  After a decade, there was a significant increase in computer/video game use. Inversely, a significant reduction in TV watching was observed, with a similar magnitude to the change in computer/video game use. The worst trends were identified on weekend days.
  
  
  CONCLUSIONS
  The decrease in TV watching after a decade appears to be compensated by the increase in computer/video game use, both in boys and girls. Interventions are needed to reduce the negative impact of technological improvements in the lifestyles of young people, especially on weekend days.
authors: Post-Graduate Program in Physical Education, Federal University of Santa Catarina, Florianopolis, Brazil.
authors: Adair S
authors: AS
authors: Lopes
authors: Post-Graduate Program in Physical Education, Federal University of Santa Catarina, Florianopolis, Brazil.
authors: Kelly S
authors: KS
authors: Silva
authors: Post-Graduate Program in Physical Education, Federal University of Santa Catarina, Florianopolis, Brazil.
authors: Valter C
authors: VC
authors: Barbosa Filho
authors: Post-Graduate Program in Physical Education, Federal University of Santa Catarina, Florianopolis, Brazil.
authors: Jorge
authors: J
authors: Bezerra
authors: Post-Graduate Program in Physical Education, Federal University of Santa Catarina, Florianopolis, Brazil.
authors: Elusa S A
authors: ES
authors: de Oliveira
authors: Post-Graduate Program in Physical Education, Federal University of Santa Catarina, Florianopolis, Brazil.
authors: Markus V
authors: MV
authors: Nahas
mesh_terms: D000293:Adolescent; D000294:Adolescent Behavior; D001938:Brazil; D016288:Computer Terminals / Q000706:statistics & numerical data*; D003430:Cross-Sectional Studies; D003906:Developing Countries; D005260:Female; D006801:Humans; D008297:Male; D015995:Prevalence; D012146:Rest; D017678:Sex Distribution; D013334:Students; D011795:Surveys and Questionnaires; D013690:Television / Q000706:statistics & numerical data* / Q000639:trends; D018910:Video Games / Q000706:statistics & numerical data*; D055815:Young Adult
keywords: TV watching; adolescent behavior; developing countries; questionnaires; sedentary behavior