Table 1. Descriptive analysis of the study variables and sex differences.
| Total | Boys | Girls | p | t | ||||
|---|---|---|---|---|---|---|---|---|
| M | SD | M | SD | M | SD | |||
| ntotal | 256 | 137 | 119 | |||||
| Age (years) | 13.20 | 0.05 | 13.25 | 1.03 | 13.15 | 0.88 | 0.090 | 0.80 |
| Weight (kg) | 54.11 | 0.74 | 55.61 | 12.10 | 52.31 | 9.79 | 0.079 | 2.37 |
| Tricipital fold (mm) | 17.56 | 0.48 | 16.39 | 8.83 | 19.00 | 6.24 | 0.001 | −2.68 |
| Subescapular fold (mm) | 13.40 | 0.49 | 12.76 | 7.54 | 14.20 | 6.10 | 0.121 | −1.66 |
| Strength of the lower limbs (cm) | 156.28 | 1.87 | 168.05 | 31.26 | 142.12 | 23.53 | 0.052 | 6.93 |
| Number of trips/week | 8.09 | 2.43 | 8.03 | 2.45 | 8.17 | 2.42 | 0.424 | −0.45 |
| Distance (m) | 1,703.50 | 770.62 | 1,732.12 | 860.74 | 1,670.83 | 654.83 | 0.853 | 0.63 |
| Time (min) | 20.44 | 9.24 | 20.78 | 10.32 | 20.05 | 7.85 | 0.853 | 0.63 |
| Average slope (%) | 2.93 | 2.12 | 3.12 | 2.69 | 2.71 | 1.14 | 0.104 | 1.52 |
| Body fat (%) | 26.47 | 0.64 | 25.86 | 11.61 | 27.26 | 6.90 | 0.000 | −1.17 |
| Cardiorrespiratory fitness (mL·kg−1·min−1) | 41.81 | 0.36 | 43.93 | 5.95 | 39.29 | 4.14 | 0.000 | 6.66 |