title: Delayed bedtime due to screen time in schoolchildren: importance of area deprivation.
abstract: BACKGROUND
  Sleep duration is an important predictor of obesity and health. This study evaluated the association between late bedtime and screen time, and the role of geographical deprivation in English schoolchildren.
  
  
  METHODS
  We collected bedtime and waking time, screen time, sociodemographic data and measured body mass index in a cross-section of 1332 11-15-year-old schoolchildren (45.7% female) participating in the East of England healthy heart study. Logistic regression was used to determine the likelihood of late bedtime in schoolchildren with different screen time and from a different geographic location. Mean differences were assessed either on ANOVA or t-test.
  
  
  RESULTS
  Approximately 42% of boys went to bed late at night compared with 37% of girls. When compared to those with <2 h of daily screen time, schoolchildren with 2-4 h of screen time were more likely [odds ratio (OR) = 1.50, 95% confidence interval (CI): 1.07-2.09] to go to bed late at night while those with >4 h of daily screen time were most likely to go to sleep late at night (OR, 1.97; 95%CI: 1.34-2.89). Late bedtime was associated with deprivation in schoolchildren.
  
  
  CONCLUSIONS
  High screen time and deprivation may explain lateness in bedtime in English schoolchildren. This explanation may vary according to area deprivation and geographic location. Family-centered interventions and parental support are important to reduce screen time, late bedtime and increase sleep duration.
authors.affiliation: Obesity Research and Management, Department of Medicine, University of Alberta, Edmonton, Alberta, Canada.
authors.forename: Ayodele A
authors.initials: AA
authors.lastname: Ogunleye
authors.forename: Christine
authors.initials: C
authors.lastname: Voss
authors.forename: Gavin R
authors.initials: GR
authors.lastname: Sandercock
mesh_terms: D000293:Adolescent; D015992:Body Mass Index; D002648:Child; D003430:Cross-Sectional Studies; D004739:England / Q000453:epidemiology; D005260:Female; D006801:Humans; D015994:Incidence; D008297:Male; D009765:Obesity / Q000453:epidemiology* / Q000209:etiology / Q000503:physiopathology; D012307:Risk Factors; D012890:Sleep / Q000502:physiology*; D012892:Sleep Deprivation / Q000150:complications* / Q000453:epidemiology / Q000503:physiopathology; D011795:Surveys and Questionnaires
keywords: bedtime; children; deprivation; geographic location; screen time