Table 3.
Distribution of birthdates in male athletes according to the playing position.
| Q1 | Q2 | Q3 | Q4 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
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| Variable | n | % | z-value | n | % | z-value | n | % | z-value | n | % | z-value | χ2 | df | p-value | OR (Q1:Q4) | OR (1st:2nd) |
| Playing Position | 8.265 | 12 | 0.764 | ||||||||||||||
| Outside Hitters | 24 | 32.9 | 0.5 | 16 | 28.6 | -0.4 | 12a | 30.8 | 0.0 | 10a | 28.6 | -0.3 | 7.419 | 3 | 0.060 | 2.40 | 1.82 |
| Opposites | 11 | 15.1 | 0.4 | 9 | 16.1 | 0.6 | 6 | 15.4 | 0.3 | 2a,b | 5.7 | -1.5 | 6.571 | 3 | 0.087 | 5.50 | 2.50 |
| Liberos | 6 | 8.2 | -1.0 | 7 | 12.5 | 0.3 | 6 | 15.4 | 0.9 | 4 | 11.4 | 0.0 | 0.826 | 3 | 0.843 | 1.50 | 1.30 |
| Setters | 10 | 13.7 | -1.0 | 8 | 14.3 | -0.7 | 9 | 22.9 | 1.1 | 8 | 22.9 | 1.0 | 0.314 | 3 | 0.957 | 1.25 | 1.06 |
| Middles | 22 | 30.1 | 0.7 | 16 | 28.6 | 0.3 | 6a,b | 15.4 | -1.8 | 11 | 31.4 | 0.6 | 10.236 | 3 | 0.017* | 2.00 | 2.24 |
Q1–Q4 = birth quarter; χ2 = Chi-square value; OR = odds ratio; Q1:Q4 = first quarter compared to the fourth quarter; 1st:2nd odds ratio from the 1st semester to the 2nd semester; a = pairwise Chi-square comparison different from Q1 (adjusted for multiple comparison); b = pairwise Chi-square comparison different from Q2 (adjusted for multiple comparison); * = significant difference.