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Table 2 The means and medians of hand grip strength, vertical jump and sit-and-reach in age groups across sex among children and adolescents aged 7–18 in China, 2014

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

Age   GS (kg)   VJ (cm)   SR (cm)
n Mean SD Median IQR n mean SD Median IQR n mean SD Median IQR
Boys
 7–8 73 9.40 2.49 10.00 3.00 42 18.69 3.22 18.65 5.00 45 0.20 5.66 − 0.60 7.70
 9–10 208 11.88 3.29 12.00 4.00 142 18.58 4.09 18.25 6.10 149 0.60 5.79 1.50 7.40
 11–12 223 15.62 5.19 15.00 6.00 157 21.46 5.52 21.30 7.60 165 1.01 5.88 1.80 7.80
 13–14 178 24.29 7.19 24.00 10.00 119 23.81 6.23 22.90 7.70 122 3.91 6.86 3.90 8.80
 15–16 155 32.79 7.61 32.00 9.00 93 25.76 7.17 25.30 9.30 94 7.89 7.52 7.65 10.50
 17–18 179 36.91 † 6.75 36.00 9.00 119 28.47 7.08 28.40 9.10 120 8.34 7.51 8.10 8.55
 Overall 1016 22.30 11.55 19.00 20.00 672 22.93 6.80 21.95 9.05 695 3.58 7.31 3.30 9.30
Girls
 7–8 93 7.36* 2.14 8.00 2.00 42 17.06 4.00 16.50 5.10 67 2.79* 5.19 2.50 6.40
 9–10 252 9.70* 3.08 10.00 4.00 142 17.48 4.08 17.00 5.50 183 3.48* 5.75 3.40 7.20
 11–12 218 14.47* 4.80 14.00 7.00 157 19.15* 4.03 19.20 4.50 162 4.72* 6.19 4.35 7.30
 13–14 142 18.54* 4.47 18.00 6.00 119 18.51* 4.13 18.35 5.65 102 7.48* 6.81 7.85 9.60
 15–16 238 20.79* 4.53 21.00 6.00 93 18.11* 4.09 18.00 5.20 180 10.34* 6.70 10.45 8.45
 17–18 302 22.58* 4.76 22.00 5.00 119 17.98* 3.96 17.95 5.80 236 11.02* 6.89 11.80 9.25
 Overall 1245 16.61* 6.87 17.00 11.00 672 18.11* 4.08 18.00 5.50 930 7.33* 7.18 7.20 9.80
  1. SD standard deviation, IQR interquartile range
  2. *p < 0.001 for the comparison between boys and girls
  3. p < 0.001 for the linear trend tests using Cochran–Armitage method