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Table 1 Baseline characteristics of children and adolescents. N and percentage (%) for categorical data and mean and standard deviation for continuous data

From: Muscle fitness and its association with body mass index in children and adolescents aged 7–18 years in China: a cross-sectional study

 

Boys (n = 1032)

Girls (n = 1251)

Total (n = 2283)

Age*, year

13.36

3.11

13.77

3.36

13.58

3.26

Age-group*

 7–8

73

7.07

94

7.51

167

7.31

 9

97

9.40

126

10.07

223

9.77

 10

115

11.14

128

10.23

243

10.64

 11

111

10.76

116

9.27

227

9.94

 12

119

11.53

104

8.31

223

9.77

 13

103

9.98

80

6.39

183

8.02

 14

78

7.56

62

4.96

140

6.13

 15

74

7.17

98

7.83

172

7.53

 16

82

7.95

140

11.19

222

9.72

 17

78

7.56

151

12.07

229

10.03

 18

102

9.88

152

12.15

254

11.13

Residential areas*

 Urban

514

49.81

702

56.12

1216

53.26

 Rural

516

50.00

549

43.88

1065

46.65

Study sites*

 Shaanxi Province

333

32.27

309

24.70

642

28.12

 Hainan Province

699

67.73

942

75.30

1641

71.88

Stature*, cm

152.55

16.13

148.67

12.19

150.43

14.24

Weight*, kg

42.11

13.87

39.2

10.63

40.51

12.28

BMI, kg/m2

17.58

3.16

17.37

2.78

17.47

2.96

Vertical jump*, cm

22.93

6.80

18.11

4.08

20.18

5.92

Hand grip strength*, kg

22.30

11.55

16.61

6.87

19.17

9.69

Sit-and-reach*, cm

3.58

7.31

7.33

7.18

5.72

7.47

  1. *p < 0.05 for the comparison between boys and girls
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BMC Pediatrics

ISSN: 1471-2431

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