title: Screen time and physical activity behaviours are associated with health-related quality of life in Australian adolescents.
abstract: OBJECTIVE
  To explore the cross-sectional relationships between health-related quality of life (HRQoL) and physical activity (PA) behaviours and screen-based media (SBM) use among a sample of Australian adolescents.
  
  
  METHODS
  Data came from baseline measures collected for the It's Your Move! community-based obesity prevention intervention. Questionnaire data on sociodemographics, PA, SBM and HRQoL were collected from 3,040 students (56% boys) aged 11-18 years in grade levels 7-11 in 12 secondary schools. Anthropometric data were measured.
  
  
  RESULTS
  The highest level of PA at recess, lunchtime and after school was associated with higher HRQoL scores (boys, by 5.3, 8.1, 6.3 points; girls, by 4.2, 6.1, 8.2 points) compared with not being active during these periods. Exceeding 2 h of SBM use each day was associated with significantly lower HRQoL scores (boys, by 3.2 points; girls, by 4.0 points). Adolescents who were physically active and low SBM users on school days had higher HRQoL scores (boys, by 6.6 points; girls, by 7.8 points) compared with those who were not physically active every school day and high SBM users on school days.
  
  
  CONCLUSIONS
  Several of the relationships between low PA and high SBM use and HRQoL were comparable to those previously observed between chronic disease conditions and HRQoL, indicating that these behaviours deserve substantial attention.
authors.affiliation: WHO Collaborating Centre for Obesity Prevention, Deakin University, Geelong Waterfront Campus, 1 Gheringhap Street, Geelong, VIC, 3220, Australia. katie.lacy@deakin.edu.au
authors.forename: Kathleen E
authors.initials: KE
authors.lastname: Lacy
authors.forename: Steven E
authors.initials: SE
authors.lastname: Allender
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Kremer
authors.forename: Andrea M
authors.initials: AM
authors.lastname: de Silva-Sanigorski
authors.forename: Lynne M
authors.initials: LM
authors.lastname: Millar
authors.forename: Marjory L
authors.initials: ML
authors.lastname: Moodie
authors.forename: Louise B
authors.initials: LB
authors.lastname: Mathews
authors.forename: Mary
authors.initials: M
authors.lastname: Malakellis
authors.forename: Boyd A
authors.initials: BA
authors.lastname: Swinburn
mesh_terms: D000293:Adolescent; D001315:Australia; D002648:Child; D003201:Computers / Q000706:statistics & numerical data*; D003430:Cross-Sectional Studies; D015444:Exercise; D005260:Female; D006304:Health Status; D006801:Humans; D008297:Male; D009765:Obesity; D011788:Quality of Life; D057185:Sedentary Behavior; D011795:Surveys and Questionnaires; D013690:Television / Q000706:statistics & numerical data*; D018910:Video Games / Q000706:statistics & numerical data