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Distribution of birth dates and relative age effect size of soccer players according to the team level.
| Team | Number & % of players per quartile | χ2 | p | Effect size (d) | ||||
|---|---|---|---|---|---|---|---|---|
| Q1 (%) | Q2 (%) | Q3 (%) | Q4 (%) | Total | ||||
| A | 107 (33.2) | 85 (26.4) | 69 (21.4) | 61 (18.9) | 322 | 15.342 | .002 | .4473 |
| B | 107 (31.8) | 86 (25.5) | 79 (23.4) | 65 (19.3) | 337 | 10.905 | .012 | .3657 |
| C and subseq. | 110 (24.5) | 116 (25.8) | 117 (26.1) | 106 (23.6) | 449 | .719 | .869 | .0801 |
Note. Q1-Q4 = birth quartiles 1-4; χ2 = Chi-square value; p = significance.
