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Table 1 Unadjusted descriptive statistics§

From: Sleep duration and risk of obesity among a sample of Victorian school children

   All (N=289) Boys (N=127) Girls (N=162)
Age (years)   11.2 ± 1.0 11.3 ± 1.1 11.1 ± 1.0
English sole language at home (% ) a   87.0 86.9 87.0
SEIFA (%)* 1st Quintile 24.6 31.1 19.8
  2nd Quintile 27.9 27.7 28.0
  3rd Quintile 12.0 8.4 14.7
  4th Quintile 30.4 28.6 31.9
  5th Quintile 5.1 4.2 5.7
BMI-z * 0.4 ± 1.1 0.6 ± 1.2 0.3 ± 1.1*
Overweight/Obese (% ) b* 30.5 36.2 25.9*
WC (cm) ** 66.1 ± 8.7 67.6 ± 9.3 64.9 ± 8.1**
Average no of accelerometer days 5.1 ± 1.3 5.2 ± 1.3 5.1 ± 1.3
Average wear time (min.day-1) 786.1 ± 70.1 784.7 ±73.1 787.1 ±67.9
MVPA (min.day-1) ** 101.0 ± 31.0 116.5 ± 29.2 88.9 ± 26.7**
Precent meeting PA Guidelines (%) ** 91.4 96.9 87.0**
LPA (min.day-1)** Total LPA 196.9 ± 33.7 191.4±28.8 201.1 ± 36.6**
  Low LPA 160.3±16.3 163.9±13.0 155.9±18.9
  Med LPA 196.3±8.2 196.6±8.4 196.1±8.0
  High LPA 233.9±19.2 220.1±12.5 236.4±21.6
ST (min.day-1) * Total ST 487.2 ± 81.2 475.9±83.4 496.1±78.6*
  Low ST 406.8±36.9 396.2±40.8 416.7±29.8
  Med ST 481.9±15.3 480.6±16.3 482.9±14.6
  High ST 578.4±59.5 574.1±58.7 581.3±60.4
Sleep Duration (%) <5 2.1 3.1 1.2
  5 1.0 0.8 1.2
  6 2.8 3.9 1.9
  7 3.1 3.1 3.1
  8 7.3 7.9 6.8
  9 17.0 15.0 18.5
  10 38.0 41.7 35.2
  11 18.7 12.6 23.5
  ≥12 10.0 11.8 8.6
Sleep Category (%)
Insufficient (<10hrs/night) 33.2 33.9 32.7
Sufficient (≥10hrs/night) 66.8 66.1 67.3
TV in bedroom (%) a 31.8 33.1 30.9
Number of TVs
in house (%)
<2 40.8 36.2 44.4
3-4 40.5 43.3 38.3
≥5 18.7 20.5 17.3
Computer/Elec. games
in bedroom(%) a *
  39.3 45.2 34.8*
  1. § ±3SD on BMI, waist, ST, MVPA and LPA excluded
  2. a Divergent number of participants: English sole language at home: N=122 for boys; TV in bedroom: N=124 for boys; Computer/Elec. Games in bedroom: N=124 for boys and N=161 for girls
  3. b defined by WHO World Health Organization. (1)
  4. * p<0.05 for sex difference; ** p<0.01 for sex difference
  5. SEIFA - Socio-Economic Indexes for Areas; WC–waist circumference; MVPA-moderate to vigorous physical activity; LPA-low intensity physical activity; ST- sedentary time
  6. 1. World Health Organization. WHO Child Growth Standards: Length/height-for-age, weight-for-age, weight-for-length, weight-for-height and body mass index-for-age, Methods and development. 2006