Table 1.
Participants’ characteristics.
| All | Boys | Girls | |||||||
|---|---|---|---|---|---|---|---|---|---|
| N | M | SD | N | M | SD | N | M | SD | |
| Age (years) | 315 | 15.85 | 0.32 | 132 | 15.81 | 0.33 | 183 | 15.87 | 0.32 |
| Height (cm) | 306 | 171.48 | 8.04 | 126 | 178.23 | 5.72 | 180 | 166.76 * | 5.74 |
| Weight (kg) | 306 | 64.71 | 11.18 | 126 | 68.96 | 11.31 | 180 | 61.73 * | 10.10 |
| Fat% | 307 | 26.39 | 9.03 | 127 | 19.37 | 7.68 | 180 | 31.34 * | 6.17 |
| FFM (kg) | 303 | 47.36 | 8.55 | 125 | 55.09 | 6.62 | 178 | 41.93 * | 4.70 |
| PA (ctm) | 300 | 2028.42 | 464.04 | 121 | 2010.74 | 463.20 | 179 | 2040.38 | 465.52 |
| CRF (maxW) | 250 | 182.81 | 49.32 | 108 | 225.4 | 39.89 | 142 | 150.41 * | 25.28 |
| CRF (W/kgFFM) | 248 | 3.81 | 0.54 | 108 | 4.09 | 0.54 | 140 | 3.60 * | 0.43 |
| Screen time (hrs) | 299 | 5.85 | 2.56 | 126 | 6.21 | 2.54 | 173 | 5.59 * | 2.58 |
M = mean, SD = standard deviations, PA = physical activity, Fat% = body fat percentage, FFM = fat free mass, CRF = cardiorespiratory fitness. * p < 0.05.