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Table 1 Sample characteristic across sleep duration groups among children aged 5-15 years in South Australia (SA), January 2004 to December 2008

From: Short sleep duration and obesity among Australian children

  ≥10 hours (n = 1812) 9-10 hours (n = 848) <9 hours (n = 835) P
Age (SD) 9.2(2.9) 12.0(2.7) 12.7(2.6) <0.001
Boys (%) 50.7 51.5 48.1 0.621
Obesity (%) 8.9 5.2 7.8 0.004
   Age 5-10 years (n = 1574) 11.5 12.9 22.3 0.032
   Age 11-12 years (n = 631) 3.3 3.6 10.3 0.067
   Age 13-15 years (n = 1290) 4.1 2.2 3.2 0.606
BMI (mean, SE) 18.0(0.14) 19.5(0.20) 20.4(0.27) <0.001
Household income (%)     
   >20000$ 87.0 86.3 82.5  
   up to 20000$ 5.6 7.2 8.6 0.013
   not stated 7.3 6.5 8.9  
Area of residence (%)     
   Metro Adelaide 67.6 70.4 75.7 <0.001
   SA country 32.4 29.6 24.3  
Intake of vegetable (servings/day) (mean, SE) 2.2(0.04) 2.4(0.07) 2.3(0.07) 0.113
Intake of fruit (servings/day) (mean, SE) 1.8(0.03) 1.7(0.06) 1.6(0.05) 0.001
Hours on sport per day(mean, SE) 0.4(0.02) 0.6(0.03) 0.7(0.06) <0.001
Hours on reading for pleasure per day(mean, SE) 0.5(0.02) 0.6(0.03) 0.7(0.05) 0.001
Hours on studying/home work at home per day(mean, SE) 0.5(0.03) 0.7(0.04) 0.9(0.04) <0.001
Hours on TV, video, computer games(mean, SE) 1.7(0.04) 1.9(0.06) 2.1(0.08) <0.001
  1. SE = standard error, BMI = body mass index
  2. P-value is from comparison across groups of sleep duration using ANOVA (continuous variables), or chi-square test (categorical variables)