title: Prevalence of high screen time in English youth: association with deprivation and physical activity.
abstract: BACKGROUND
  Physical activity (PA) and deprivation are major determinants of health. We estimated the prevalence of high screen time (ST) among English youth and examined whether deprivation mediated the relationship between ST and PA.
  
  
  METHODS
  It is a cross-sectional study of 6240 participants (53% boys, aged 10-15 years) enrolled in the East of England Healthy Hearts study. The participants were categorized into three groups based on daily ST: <2, 2-4 or >4 h. Participants were classified as 'active' or 'inactive' based on PA z-scores.
  
  
  RESULTS
  Prevalence of >2 h ST was 36%. Participants reporting <2 h daily ST were more likely to be active than those reporting 2-4 h (adjusted OR: 1.51, 95% CI: 1.26-1.82, P< 0.001) or >4 h (adjusted OR: 2.26, 95% CI: 1.91-2.67, P< 0.001). Analysis of covariance demonstrated a significant main effect for ST on PA (F = 85.7, P< 0.001) with lower PA in each ascending ST group (P< 0.001). Deprivation was not significantly associated with PA and did not mediate the relationship between ST and PA.
  
  
  CONCLUSIONS
  There is high prevalence of >2 h ST in English schoolchildren. PA is lower in children reporting 2-4 versus <2 h daily ST and lower still in those classified as heavy users (>4 h) independent of deprivation.
authors.affiliation: Centre for Sports and Exercise Science, School of Biological Sciences, University of Essex, Colchester CO4 3SQ, UK. aaogun@essex.ac.uk
authors.forename: A A
authors.initials: AA
authors.lastname: Ogunleye
authors.forename: C
authors.initials: C
authors.lastname: Voss
authors.forename: G R
authors.initials: GR
authors.lastname: Sandercock
mesh_terms: D000293:Adolescent; D015992:Body Mass Index; D002648:Child; D003201:Computers / Q000191:economics / Q000706:statistics & numerical data*; D003430:Cross-Sectional Studies; D004739:England; D005260:Female; D006801:Humans; D016015:Logistic Models; D008297:Male; D009043:Motor Activity; D011203:Poverty; D057185:Sedentary Behavior; D013690:Television / Q000191:economics / Q000706:statistics & numerical data*; D013997:Time Factors