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Table 1 Sample characteristics across age and gender groups in the national school-based survey

From: Short sleep duration is associated with specific food intake increase among school-aged children in China: a national cross-sectional study

 

All (n = 62,517)

6–12 years old (n = 40,924)

13–18 years old (n = 20,593)

P Value for age groups

Boys (n = 32,257)

Girls (n = 30,260)

P Value for gender

Child characteristics, mean ± SD, median with quartile or %

 Female

48.4

47.3

50.5

< 0.001

0

100

< 0.001

 Age (years)

10.82(3.30)

8.98(1.88)

14.64(1.37)

< 0.001

10.92(3.91)

11.06(3.22)

< 0.001

 Height (cm)

145.82(17.09)

137.87(12.62)

163.50(8.41)

< 0.001

148.25(18.10)

145.57(14.84)

< 0.001

 Weight (kg)

40.94(15.53)

34.50(11.49)

55.78(12.79)

< 0.001

43.71(17.17)

40.25(13.72)

< 0.001

 BMI (kg2/m)

18.78(3.84)

17.71(3.42)

20.74(3.79)

< 0.001

19.13(4.03)

18.42(3.59)

< 0.001

Family income (%)

   

< 0.001

  

< 0.001

  < 5000 yuan/month

28.0

27.0

29.9

 

27.1

29.0

 

  > 5000 yuan/month

14.2

15.2

12.3

 

14.0

14.4

 

 Not known

57.8

57.8

57.8

 

58.9

56.6

 

Maternal educational level (%)

   

< 0.001

  

0.004

  < 9 years

47.4

43.4

56.0

 

48.1

46.6

 

 9–12 years

26.2

27.0

24.4

 

25.9

26.5

 

  > 12 years

26.4

29.6

19.6

 

26.0

26.9

 

Physical activity (Hours/day)

 IPA

0.21 (0.05, 0.57)

0.21 (0.02, 0.57)

0.23 (0.07, 0.57)

0.07

0.29 (0.07, 0.67)

0.19 (0.01, 0.48)

< 0.001

 MPA

0.22 (0.00, 0.64)

0.23 (0.00, 0.64)

0.21 (0.00, 0.57)

0.21

0.25 (0.00, 0.67)

0.21 (0.00, 0.50)

< 0.001

 Walking

0.48 (0.14, 1.00)

0.42 (0.00.14, 1)

0.50 (0.14, 1.00)

< 0.001

0.50 (0.14, 1.00)

0.43 (0.14, 1.00)

< 0.001

Sedentary behaviour (hours/week)

 TV watching

3.50 (1.75, 7.23)

5.25 (3.50, 8.17)

3.50(0.00, 7.00)

< 0.001

4.67 (2.33, 8.17)

3.50 (1.17, 7.00)

< 0.001

 PC game

2.33 (0.00, 7.00)

2.33 (0.00, 7.00)

3.50 (0.00, 7.00)

< 0.001

3.50 (0.00, 7.00)

2.33 (0.00, 7.00)

< 0.001

 Homework

12.25 (7.00, 17.50)

10.50 (7.00, 14.00)

15.75 (10.50, 21.00)

< 0.001

10.50 (7.00, 17.50)

14.00 (7.00, 18.00)

< 0.001

Sleep duration

   

< 0.001

  

< 0.001

 LSD

25.3

35.0

6.7

 

26.5

24.1

 

 MSD

57.1

57.5

56.3

 

57.9

56.2

 

 SSD

17.6

7.5

37.1

 

15.6

19.7

 

Diet intake (serves/week)

 Sugar Beverage

1 (0, 3)

1(0, 2)

0 (2, 5)

< 0.001

2 (0, 4)

1 (0, 2)

< 0.001

 Meat

1 (1, 19)

7 (3, 8)

7 (3, 10)

< 0.001

7 (4, 12)

6 (3, 7)

< 0.001

 Fruits

7 (4, 14)

7 (5, 14)

7 (3, 12)

< 0.001

7 (4, 12)

7 (4, 14)

< 0.001

 Vegetables

10 (7, 14)

10 (7, 14)

10 (7, 14)

0.41

10 (7, 12)

10 (7, 14)

0.27

  1. BMI Body mass index, IPA intensive physical activity, MPA moderate physical activity, LSD Long sleep duration, MSD Middle sleep duration, SSD Short sleep duration. Sample characteristics are presented as Mean ± Standard deviation (normally distributed, age, height, weight and BMI), Median with quartile (median, Q25 and Q75, including physical activity, sedentary behaviours and diet intake) and frequency (%, family income, maternal educational level and sleep duration)
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