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Table 2 Baseline characteristics according to sleep duration among normal weight children aged 6–17 years

From: Gender-dependent association between sleep duration and overweight incidence in CHINESE school children: a national follow-up study

Characteristic > 9 h 7–9 h < 7 h P for difference
Age group
 Before adolescents (male: 6–11 years, female:6–10 years) 2947 4293 551 < 0.001
 Young adolescents (male: 12–15 years, Female: 11–14 years) 643 3044 823  
 Elder adolescents (male: 15–17 years, Female: 16–17 years) 76 1285 1382  
Demographics
 No. of participants 3666 8622 2756  
 Male (%) 48.0 46.4 42.2 < 0.001
 Age (years) 9.64(0.06) 11.37(0.04) 13.53(0.07) < 0.001
 From Northern area (%) 36.8 37.2 39.7 < 0.001
 Monthly income of Family (%)     < 0.001
  ≤ 5000 yuan 24.0 60.1 15.9  
  > 5000 yuan 26.7 58.9 14.5  
 Not willing to answer 23.9 55.0 21.0  
 Mother’s education year (%)     < 0.001
  ≤ 9 24.4 59.1 16.5  
  10–12 25.5 59.5 15.0  
  13–16 27.6 58.9 13.4  
  ≥ 16 29.2 56.1 14.7  
Puberty on-set (%) 8.0 27.5 59.0 < 0.001
Lifestyle
Physical activity(PA)
 High-level PA (hour/day) 0.56(0.14) 0.52(0.01) 0.52(0.02) < 0.001
 Middle-level PA (hour/day) 0.56(0.02) 0.47(0.01) 0.46(0.02) < 0.001
 Walking (hour/day) 0.80(0.02) 0.76(0.02) 0.83(0.03) < 0.001
 Sedentary (hour/week) 34.70(0.52) 40.03(0.33) 45.42(0.62) < 0.001
Dietary intake(serve/day)
 Meat 1.14(0.02) 1.17(0.02) 1.25(0.03) < 0.001
 Sugar beverage 0.29(0.02) 0.41(0.01) 0.56(0.02) < 0.001
 Fruit 1.43(0.02) 1.26(0.01) 1.21(0.03) < 0.001
 Vegetable 1.94(0.03) 1.79(0.02) 1.71(0.03) < 0.001
Anthropometry
 Height (cm) 139.77(0.31) 148.07(0.20) 156.82(0.363) < 0.001
 Weight (kg) 33.22(0.24) 39.93(0.15) 47.43(0.28) < 0.001
 BMI 16.65(0.05) 17.70(0.03) 18.86(0.05) < 0.001
  1. Continuous variables are displayed as mean (standard error), categorical variables are displayed as proportion
  2. P values are from T-tests (continuous variables) and chi-square tests (categorical variables) between boys and girls
  3. BMI body mass index, PA physical activity, HLPA high level physical activity, MLPA middle level activity