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Participants’ characteristics, grouped by football age category (mean ± standard deviation).
| Variable | U14 | U15 | U17 | U19 | Total |
|---|---|---|---|---|---|
| Age (years) | 13.1 ± 0.3 | 14.0 ± 0.2 | 15.4 ± 0.5 | 17.9 ± 0.8 | 14.9 ± 1.8 |
| Height (cm) | 160.5 ± 10.7 | 170.5 ± 6.9 | 172.9 ± 6.7 | 176.4 ± 6.4 | 169.7 ± 9.8 |
| Body mass (kg) | 51.1 ± 10.5 | 60.0 ± 8.7 | 62.8 ± 8.0 | 70.7 ± 8.9 | 60.6 ± 11.3 |
| BMI (kg·m−2) | 19.7 ± 2.9 | 20.6 ± 2.3 | 21.0 ± 1.9 | 22.7 ± 2.1 | 20.9 ± 2.6 |
| PDS (a.u.) | 2.1 ± 0.6 | 2.4 ± 0.5 | 2.7 ± 0.5 | 3.2 ± 0.5 | 2.5 ± 0.6 |
