title: Sleep duration and risk of obesity among a sample of Victorian school children.
abstract: BACKGROUND
  Insufficient sleep is potentially an important modifiable risk factor for obesity and poor physical activity and sedentary behaviours among children. However, inconsistencies across studies highlight the need for more objective measures. This paper examines the relationship between sleep duration and objectively measured physical activity, sedentary time and weight status, among a sample of Victorian Primary School children.
  
  
  METHODS
  A sub-sample of 298 grades four (n = 157) and six (n = 132) Victorian primary school children (aged 9.2-13.2 years) with complete accelerometry and anthropometry data, from 39 schools, were taken from a pilot study of a larger state based cluster randomized control trial in 2013. Data comprised: researcher measured height and weight; accelerometry derived physical activity and sedentary time; and self-reported sleep duration and hypothesised confounding factors (e.g. age, gender and environmental factors).
  
  
  RESULTS
  Compared with sufficient sleepers (67 %), those with insufficient sleep (<10 hrs/day) were significantly more likely to be overweight (OR 1.97, 95 % CI:1.11-3.48) or obese (OR 2.43, 95 % CI:1.26-4.71). No association between sleep and objectively measured physical activity levels or sedentary time was found.
  
  
  CONCLUSIONS
  The strong positive relationship between weight status and sleep deprivation merits further research though PA and sedentary time do not seem to be involved in the relationship. Strategies to improve sleep duration may help obesity prevention initiatives in the future.
authors.affiliation: School of Health and Social Development, Deakin University, 221 Burwood Hwy, Burwood, Victoria, 3125, Australia. bridget.morrissey@deakin.edu.au.
authors.forename: Bridget
authors.initials: B
authors.lastname: Morrissey
authors.affiliation: World Health Organization's Collaborating Centre for Obesity Prevention, Deakin Population Health, Deakin University, Geelong, Australia. mary.malakellis@deakin.edu.au.
authors.forename: Mary
authors.initials: M
authors.lastname: Malakellis
authors.affiliation: The CO-OPS Collaboration, WHO-CC, Deakin Population Health, Deakin University, Geelong, Australia. jill.whelan@deakin.edu.au.
authors.forename: Jill
authors.initials: J
authors.lastname: Whelan
authors.affiliation: School of Health and Social Development, Deakin University, 221 Burwood Hwy, Burwood, Victoria, 3125, Australia. lynne.millar@deakin.edu.au.|World Health Organization's Collaborating Centre for Obesity Prevention, Deakin Population Health, Deakin University, Geelong, Australia. lynne.millar@deakin.edu.au.
authors.forename: Lynne
authors.initials: L
authors.lastname: Millar
authors.affiliation: World Health Organization's Collaborating Centre for Obesity Prevention, Deakin Population Health, Deakin University, Geelong, Australia. boyd.swinburn@auckland.ac.nz.|School of Population Health, The University of Auckland, Auckland, New Zealand. boyd.swinburn@auckland.ac.nz.
authors.forename: Boyd
authors.initials: B
authors.lastname: Swinburn
authors.affiliation: School of Health and Social Development, Deakin University, 221 Burwood Hwy, Burwood, Victoria, 3125, Australia. steven.allender@deakin.edu.au.|World Health Organization's Collaborating Centre for Obesity Prevention, Deakin Population Health, Deakin University, Geelong, Australia. steven.allender@deakin.edu.au.
authors.forename: Steven
authors.initials: S
authors.lastname: Allender
authors.affiliation: World Health Organization's Collaborating Centre for Obesity Prevention, Deakin Population Health, Deakin University, Geelong, Australia. claudia.strugnell@deakin.edu.au.
authors.forename: Claudia
authors.initials: C
authors.lastname: Strugnell
mesh_terms: D061725:Accelerometry; D000293:Adolescent; D000886:Anthropometry; D002648:Child; D015444:Exercise; D005260:Female; D006801:Humans; D008297:Male; D050177:Overweight / Q000453:epidemiology; D063766:Pediatric Obesity / Q000453:epidemiology*; D010865:Pilot Projects; D012306:Risk; D012307:Risk Factors; D012574:Schools; D057185:Sedentary Behavior; D057566:Self Report; D012890:Sleep; D012892:Sleep Deprivation / Q000453:epidemiology*; D013334:Students / Q000706:statistics & numerical data*; D013997:Time Factors; D014739:Victoria / Q000453:epidemiology