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
| 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 |
SD standard deviation, IQR interquartile range
*p < 0.001 for the comparison between boys and girls
†p < 0.001 for the linear trend tests using Cochran–Armitage method