Table 1.
Physical characteristics of the participants
| Boys | Girls | P | ||||
|---|---|---|---|---|---|---|
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| N | M±SD | N | M±SD | |||
| Age (year) | 7,688 | 15.4±1.6 | 7,106 | 15.1±1.6 | <0.001 | |
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| Body composition | Height (cm) | 7,688 | 169.5±7.8 | 7,104 | 159.8±5.9 | <0.001 |
| Weight (kg) | 7,688 | 63.1±13.9 | 7,104 | 54.4±9.8 | <0.001 | |
| Body mass index (kg/m2) | 7,688 | 21.9±4.1 | 7,106 | 21.3±3.4 | <0.001 | |
| Percent body fat (%) | 7,625 | 18.1±8.4 | 7,088 | 27.6±7.9 | <0.001 | |
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| Aerobic capacity | 20-m PACER (reps) | 7,664 | 46.9±21.7 | 7,088 | 26.2±13.9 | <0.001 |
| Estimated VO2max (mL·kg−1·min−1) | 7,662 | 49.0±5.8 | 7,085 | 39.0±4.8 | <0.001 | |
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| Muscular strength | Handgrip strength (kg) | 7,677 | 33.5±0.1 | 7,092 | 23.0±0.1 | <0.001 |
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| Muscular endurance | Partial curl-up (reps) | 3,274 | 39.9±21.6 | 3,595 | 30.9±22.1 | <0.001 |
| 30-s endurance jump (reps) | 6,090 | 43.5±11.3 | 5,808 | 28.4±10.8 | <0.001 | |
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| Flexibility | Sit and reach test (cm) | 7,680 | 7.7±9.2 | 7,103 | 13.5±9.4 | <0.001 |
Data are presented as mean (m)±standard deviation (SD).
PACER, progressive aerobic cardiovascular endurance run; VO2max, maximal oxygen uptake.