title: Body mass index, new modes of TV viewing and active video games.
abstract: Recent technologies have changed screen time. TV can be viewed anywhere, anytime. Content can be collected via digital recorders and online streaming and viewed on smartphones. Video games are no longer strictly sedentary.
  
  
  
  We sought to assess the unknown relations between new modes of TV viewing - recorded, online, downloaded and on hand-held devices - and active video games with body mass index (BMI).
  
  
  
  Cross-sectional analysis of the 2011 wave of the Growing Up Today Study 2 cohort. We used gender-specific generalized estimating equations to examine screen time and BMI among 3071 women and 2050 men aged 16-24 years.
  
  
  
  Among women, each hour/day of online TV (0.47; confidence interval [CI]: 0.12, 0.82) and total non-broadcast TV (0.37; CI: 0.14, 0.61) was associated with higher BMI, as was watching ≥ 1/2 h week-1of TV on hand-held devices (1.04; CI: 0.32-1.77). Active video games were associated with BMI among women, but not after restricting to those not trying to lose/maintain weight. Broadcast TV was associated with higher BMI (kg m-2) among women and men (P < 0.05).
  
  
  
  Among women, online TV, TV viewed on hand-held devices and the sum of non-broadcast TV time were associated with higher BMI. Broadcast TV was also associated with BMI in women and men.
authors.affiliation: Department of Nutrition, Harvard T.H. Chan School of Public Health, Boston, MA, USA.|Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, MA, USA.|Division of Community Health and Human Development, School of Public Health, University of California, Berkeley, CA, USA.
authors.forename: J
authors.initials: J
authors.lastname: Falbe
authors.affiliation: Department of Nutrition, Harvard T.H. Chan School of Public Health, Boston, MA, USA.|Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, MA, USA.|Channing Division of Network Medicine, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA.
authors.forename: W C
authors.initials: WC
authors.lastname: Willett
authors.affiliation: Channing Division of Network Medicine, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA.
authors.forename: B
authors.initials: B
authors.lastname: Rosner
authors.affiliation: Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, MA, USA.|Channing Division of Network Medicine, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA.|Division of Adolescent Medicine, Boston Children's Hospital, Boston, MA, USA.
authors.forename: A E
authors.initials: AE
authors.lastname: Field
mesh_terms: D000293:Adolescent; D015992:Body Mass Index; D001835:Body Weight; D015331:Cohort Studies; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008297:Male; D057185:Sedentary Behavior; D013690:Television / Q000706:statistics & numerical data*; D018910:Video Games / Q000009:adverse effects*; D055815:Young Adult
keywords: body mass index; television; video games; young adult