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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