Table 5.
Distribution of birthdates in male athletes according to performance.
| Q1 | Q2 | Q3 | Q4 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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| Variable | n | % | z- value | n | % | z- value | n | % | z- value | n | % | valu z- e | χ2 | df | p- value | OR (Q1:Q4) | OR (1st:2nd) |
| Attack Points | 1.171 | 3 | 0.760 | ||||||||||||||
| Low | 32 | 47.8 | -0.6 | 30 | 56.6 | 1.0 | 19 | 50.0 | -0.1 | 14a,b | 46.7 | -0.5 | 9.463 | 3 | 0.024* | 2.28 | 1.87 |
| High | 35 | 52.2 | 0.6 | 23 | 43.4 | -1.0 | 19a | 50.0 | 0.1 | 16a | 53.3 | 0.5 | 8.978 | 3 | 0.030* | 2.18 | 1.65 |
| Aces | 2.853 | 3 | 0.307 | ||||||||||||||
| Low | 33 | 49.3 | -0.3 | 30 | 56.6 | 1.0 | 16a,b | 42.1 | -1.2 | 16a,b | 53.3 | 0.3 | 10.305 | 3 | 0.016* | 2.06 | 1.96 |
| High | 34 | 50.7 | 0.3 | 23 | 43.4 | -1.0 | 22 | 57.9 | 1.2 | 14a | 46.7 | -0.3 | 8.720 | 3 | 0.033* | 2.42 | 1.58 |
| Block Points | 1.376 | 3 | 0.623 | ||||||||||||||
| Low | 31 | 46.3 | -0.9 | 29 | 54.7 | 0.7 | 19 | 50.0 | -0.1 | 16a,b | 53.3 | 0.3 | 6.853 | 3 | 0.077 | 1.93 | 1.71 |
| High | 36 | 53.7 | 0.9 | 24 | 45.3 | -0.7 | 19a | 50.0 | 0.1 | 14a | 46.7 | -0.3 | 11.473 | 3 | 0.009* | 2.57 | 1.82 |
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.