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Table 3 HRs for overweight incidence according to sleep duration group among Chinese normal weight children in 6–9 months follow-up

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

Group No. of Participants No. of new overweight Model 1a Model 2b
Male
  > 9 h 1735 47 1 1
 7–9 h 3950 112 1.09(0.77–1.54) 1.03(0.67–1.59)
  < 7 h 855 38 1.38(0.87–2.21) 1.21(0.65–2.24)
Female
  > 9 h 1888 46 1 1
 7–9 h 4563 140 1.23(0.87–1.74) 1.60(1.02–2.52)*
  < 7 h 1667 50 1.28(0.81–2.00) 1.71(0.95–3.08)
Stratified by age and gender
 Before adolescents
  Male (6–11 years)
    > 9 h 1416 43 1 1
   7–9 h 2148 66 1.04(0.71–1.53) 1.05(0.65–1.70)
    < 7 h 302 7 0.84(0.38–1.86) 0.84(0.29–2.40)
  Female (6–10 years)
    > 9 h 1499 34 1 1
   7–9 h 2086 64 1.41(0.93–2.13) 2.13(1.20–3.77)*
    < 7 h 247 8 1.46(0.68–3.16) 1.78(0.65–4.87)
 Young adolescents
  Male (12–15 years)
    > 9 h 287 3 1 1
   7–9 h 1411 34 2.14(0.65–7.01) 1.41(0.41–4.87)
    < 7 h 450 17 3.58(1.02–12.49)* 2.19(0.56–8.51)
  Female (11–14 years)
    > 9 h 346 7 1 1
   7–9 h 1595 44 1.12(0.50–2.52) 1.31(0.49–3.47)
    < 7 h 366 12 1.31(0.50–3.40) 1.28(0.38–4.28)
 Elder adolescents
  Male (15–17 years)
    > 9 h 32 1 1 1
   7–9 h 391 12 1.42(0.18–10.98) 0.36(0.04–3.46)
    < 7 h 405 14 1.87(0.24–14.40) 0.28(0.03–2.89)
  Female (16–17 years)
    > 9 h 43 5 1 1
   7–9 h 882 32 0.50(0.19–1.29) 0.24(0.06–0.93)*
    < 7 h 970 30 0.53(0.20–1.37) 0.28(0.07–1.12)
  1. HRs hazard ratios, risk for overweight are displayed as HR (95%CI)
  2. *P < 0.05 compared with ‘> 9 h’ group
  3. aModel 1 was adjusted for age
  4. bModel 2 was adjusted Model 1 covariates plus puberty on-set, food intake, physical activity& sedentary, domestic income and mother’s year of education