Table 3.
Birthdate distribution for female and male youth soccer and futsal players in Portugal according to the different certification levels of clubs and academies, as classified by the Portuguese Football Association.
| Certification level | n | Birthdate distribution, n (%) | χ2 | FDR-adjusted p | |||
|---|---|---|---|---|---|---|---|
| Q1 | Q2 | Q3 | Q4 | ||||
| Female | |||||||
| RP (2001–2015) | 733,119 | 176,204 (24.0) | 178,562 (24.4) | 193,580 (26.4) | 184,773 (25.2) | ||
| Soccer | |||||||
| No certification | 4,490 | 1,108 (24.7) | 1,187 (26.4) | 1,139 (25.4) | 1,056 (23.5) | 15.63 | 0.004 |
| BFTC | 291 | 76 (26.1) | 70 (24.1) | 77 (26.5) | 68 (23.4) | 0.93 | 0.888 |
| Football school | 300 | 72 (24.0) | 66 (22.0) | 89 (29.7) | 73 (24.3) | 1.98 | 0.715 |
| Training institution | 225 | 51 (22.7) | 60 (26.7) | 55 (24.4) | 59 (26.2) | 1.09 | 0.874 |
| Futsal | |||||||
| No certification | 2,211 | 593 (26.8) | 512 (23.2) | 583 (26.4) | 523 (23.7) | 10.55 | 0.014 |
| BFTC | 41 | 12 (29.3) | 11 (26.8) | 11 (26.8) | 7 (17.1) | 1.65 | 0.766 |
| Football school | 0 | --- | --- | --- | --- | ||
| Training institution | 185 | 45 (24.3) | 49 (26.5) | 47 (25.4) | 44 (23.8) | 0.57 | 0.932 |
| Male | |||||||
| RP (2001–2015) | 776,006 | 186,232 (24.0) | 189,874 (24.5) | 204,611 (26.4) | 195,289 (25.2) | ||
| Soccer | |||||||
| No certification | 74,083 | 19,265 (26.0) | 18,336 (24.8) | 19,131 (25.8) | 17,351 (23.4) | 224.54 | <0.001 |
| BFTC | 6,850 | 1,810 (26.4) | 1,753 (25.6) | 1,741 (25.4) | 1,546 (22.6) | 41.01 | <0.001 |
| Football school | 10,871 | 2,812 (25.9) | 2,746 (25.3) | 2,774 (25.5) | 2,539 (23.4) | 35.73 | <0.001 |
| Training institution | 34,481 | 9,658 (28.0) | 8,869 (25.7) | 8,548 (24.8) | 7,406 (21.5) | 472.08 | <0.001 |
| Futsal | |||||||
| No certification | 17,678 | 4,295 (24.3) | 4,318 (24.4) | 4,655 (26.3) | 4,410 (24.9) | 1.01 | 0.880 |
| BFTC | 1,858 | 489 (26.3) | 447 (24.1) | 472 (25.4) | 450 (24.2) | 5.61 | 0.246 |
| Football school | 1,417 | 346 (24.4) | 335 (23.6) | 408 (28.8) | 328 (23.1) | 5.96 | 0.224 |
| Training institution | 3,035 | 801 (26.4) | 798 (26.3) | 777 (25.6) | 659 (21.7) | 26.43 | <0.001 |
BFTC, basic football training center; FDR, false discovery rate; RP, reference population. Values in bold are significant.