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Table 2 Baseline characteristics among children aged 6–18 years in urban Guangzhou, China

From: Association between sleep duration and obesity is age- and gender-dependent in Chinese urban children aged 6–18 years: a cross-sectional study

 

Total (n = 8760)

Boys (n = 4293)

Girls (n = 4467)

P value

Age(year)

11.42(3.39)

11.40(0.051)

11.44(0.051)

0.164

Height(cm)

146.23(19.18)

147.56(0.31)

144.91(0.27)

<0.001

 6–12 years

132.12(11.76)

132.18(0.24)

132.06(0.25)

0.728

 13–18 years

161.30(13.16)

164.49(0.30)

158.23(0.20)

<0.001

Weight(kg)

40.33(15.74)

42.06(0.25)

38.62(0.22)

<0.001

 6–12 years

29.23(9.63)

30.27(0.20)

28.17(0.20)

<0.001

 13–18 years

52.19(11.86)

55.04(0.29)

49.46(0.21)

<0.001

BMI(kg/m2)

18.16(4.84)

18.52(0.068)

17.80(0.078)

0.034

 6–12 years

16.48(4.60)

17.00(0.078)

15.95(0.112)

<0.001

 13–18 years

19.95(4.44)

20.19(0.102)

19.71(0.091)

0.01

Dietary intake (servings/day)

    

Fruit

1.23(1.12)

1.22(0.018)

1.25(0.016)

0.062

 6–12 years

1.23(1.104)

1.20(0.024)

1.26(0.023)

0.059

 13–18 years

1.24(0.018)

1.24(0.026)

1.23(0.024)

0.790

Vegetable

1.93(1.61)

1.94(0.025)

1.92(0.024)

0.011

 6–12 years

1.76(1.49)

1.76(0.031)

1.75(0.031)

0.739

 13–18 years

2.11(1.71)

2.13(0.039)

2.09(0.035)

0.488

Meat

1.61(1.46)

1.77(0.024)

1.45(0.019)

<0.001

 6–12 years

1.40(1.29)

1.49(0.030)

1.30(0.025)

<0.001

 13–18 years

1.84(1.59)

2.08(0.039)

1.60(0.029)

<0.001

Sugar beverage

0.37(0.73)

0.46(0.013)

0.29(0.008)

<0.001

 6–12 years

0.21(0.44)

0.25(0.011)

0.17(0.007)

<0.001

 13–18 years

0.55(0.92)

0.70(0.024)

0.41(0.014)

<0.001

Physical Activity (PA, hour/day)

    

HLPA

0.44(0.64)

0.52(0.011)

0.35(0.008)

<0.001

 6–12 years

0.41(0.58)

0.45(0.013)

0.36(0.011)

<0.001

 13–18 years

0.47(0.70)

0.60(0.018)

0.34(0.012)

<0.001

MLPA

0.40(0.61)

0.43(0.010)

0.37(0.008)

<0.001

 6–12 years

0.39(0.58)

0.40(0.012)

0.39(0.012)

0.452

 13–18 years

0.41(0.64)

0.46(0.016)

0.36(0.012)

<0.001

Walking

0.87(1.18)

0.92(0.020)

0.81(0.016)

<0.001

 6–12 years

0.75(1.16)

0.77(0.025)

0.74(0.023)

0.490

 13–18 years

0.98(1.19)

1.10(0.030)

0.88(0.021)

<0.001

Sedentary

4.35(3.78)

4.28(0.057)

4.43(0.058)

0.008

 6–12 years

4.09(3.54)

4.06(0.073)

4.11(0.075)

0.622

 13–18 years

4.63(4.00)

4.51(0.087)

4.75(0.087)

0.054

Sleep duration (%)

    

 <7 hours

17.9

15.4

20.2

<0.001

 7–9 hours

59.0

60.7

57.5

 >9 hours

23.1

23.9

22.3

Obesity (%)

8.4

9.8

5.7

<0.001

 6–12 years

6.6

8.1

5.2

 

 13–18 years

10.1

13.4

6.8

 
  1. BMI body mass index, PA physical activity, HLPA high level physical activity, MLPA middle level activity
  2. Continuous variables are displayed as mean ± standard error(boys and girls) and mean ± standard deviation(total), categorical variables are displayed as proportion
  3. P values are from T-tests (continuous variables) and chi-square tests (categorical variables) between boys and girls