title: Physical activity and screen time in adolescents transitioning out of compulsory education: a prospective longitudinal study.
abstract: BACKGROUND
  Within the UK context, it is unclear whether physical activity and screen time changes between completing compulsory education and the period afterwards, and the factors associated with any change.
  
  
  METHODS
  A prospective population-based longitudinal design among adolescents (n = 2204 at baseline) was adopted. A self-report questionnaire was administered at baseline (final year of compulsory education) and follow-up (i.e. post compulsory education) to measure physical activity over the previous 7 days and screen time (weekday and weekend) in relation to recommended guidelines. Magnitude of change in physical activity and screen time and key influencing variables associated with changes were analysed.
  
  
  RESULTS
  For physical activity, there was a significant change in participants meeting guidelines at baseline but not meeting guidelines at follow-up with 81.0% not meeting guidelines at baseline and follow-up. For screen time, there was no significant change between baseline and follow-up, with 70.6% not meeting guidelines at baseline and follow-up. Gender was associated with the change in physical activity with a decline less likely in females.
  
  
  CONCLUSIONS
  Findings reinforce the importance of reducing physical inactivity and sedentary behaviour during this transition. Factors associated with changes in physical inactivity and sedentary behaviour need further investigation.
authors.affiliation: Faculty of Medicine and Health Sciences, School of Medicine, Division of Epidemiology and Public Health, University of Nottingham, Nottingham NG5 1PB, UK.
authors.forename: C S
authors.initials: CS
authors.lastname: Owens
authors.affiliation: Faculty of Applied Sciences, School of Sport and Exercise, University of Gloucestershire, Gloucester GL2 9HW, UK.
authors.forename: D
authors.initials: D
authors.lastname: Crone
authors.affiliation: Faculty of Applied Sciences, School of Sport and Exercise, University of Gloucestershire, Gloucester GL2 9HW, UK.
authors.forename: M B A
authors.initials: MB
authors.lastname: De Ste Croix
authors.affiliation: Centre for Sport, Health and Exercise Research, Staffordshire University, Stoke-on-Trent ST4 2DF, UK.
authors.forename: C J
authors.initials: CJ
authors.lastname: Gidlow
authors.affiliation: Faculty of Applied Sciences, School of Sport and Exercise, University of Gloucestershire, Gloucester GL2 9HW, UK.
authors.forename: D V B
authors.initials: DV
authors.lastname: James
mesh_terms: D000293:Adolescent; D000294:Adolescent Behavior / Q000502:physiology; D005260:Female; D019983:Guideline Adherence; D006291:Health Policy; D006801:Humans; D016015:Logistic Models; D008137:Longitudinal Studies; D008297:Male; D009043:Motor Activity / Q000502:physiology; D011446:Prospective Studies; D012574:Schools; D057185:Sedentary Behavior; D057566:Self Report; D013690:Television / Q000706:statistics & numerical data*; D006113:United Kingdom; D018910:Video Games
keywords: correlates; inactivity; observational; school; sedentary behaviour; self-report; youth