Table 6.

Distribution of birthdates in female athletes according to performance.

	Q1			Q2			Q3			Q4
Variable	n	%	z- value	n	%	z- value	n	%	z- value	n	%	z- value	χ2	df	p- value	OR (Q1:Q4)	OR (1st:2nd)
Attack Points													2.925	3	0.403
Low	20	40.8	-1.5	27	54.0	0.7	19	47.5	-0.3	24	57.1	1.1	1.822	3	0.610	0.83	1.09
High	29	59.2	1.5	23	46.0	-0.7	21	52.5	0.3	18	42.9	-1.1	2.846	3	0.416	1.61	1.33
Aces													2.316	3	0.509
Low	24	49.0	-0.1	27	54.0	0.7	16	40.0	-1.4	23	54.8	0.7	2.889	3	0.409	1.04	1.31
High	25	51.0	0.1	23	46.0	-0.7	24	60.0	1.4	19	45.2	-0.7	0.912	3	0.823	1.31	1.12
Block Points													0.195	3	0.978
Low	24	49.0	-0.1	26	52.0	0.4	19	47.5	-0.3	21	50.0	0.0	1.289	3	0.732	1.14	1.25
High	25	51.0	0.1	24	48.0	-0.4	21	52.5	0.3	21	50.0	0.0	0.560	3	0.905	1.19	1.17

Q1–Q4 = birth quarter; χ2 = Chi-square value; OR = odds ratio; Q1:Q4 = first quarter compared to the fourth quarter; 1^st:2^nd odds ratio from the 1^st semester to the 2^nd semester