Table 2.

Differences in quarterly distribution of dates of birth of the players of knockout stage of Central Junior League 2013/2014 and 2014/2015, and those called up for national teams U-17 – U-21 in 2015.

Sample		Q1:Q2	Q1:Q3	Q1:Q4
	χ2	4.121	9.184	27.272
Players of knockout	p	0.042	0.002	< 0.001
stage of Central Junior League	ω	0.16	0.24	0.41
2013/2014	OR	1.820	2.483	5.647
	95 %
		1.134 – 2.921	1.513 – 4.072	3.114 – 10.239
	CI
	χ2	5.226	12.519	31.873
	p	0.022	< 0.001	< 0.001
Players of knockout	ω	0.26	0.40	0.63
stage of Central Junior League 2014/2015	OR	2.657	4.762	25.982
	95 %
		1.372 – 5.1450	2.302 – 9.848	7.556 – 89.351
	CI
	χ2	-0.078	5.944	32.061
Players selected for	p	0.78	0.015	< 0.001
national teams U-17 – U-21	ω	0.02	0.19	0.45
	OR	0.921	2.078	8.125
	95 %
		0.582 – 1.457	1.125 – 3.440	3.960 – 16.667
	CI

χ²– chi-squared test value, p – probability value, ω – effect size measure, OR – odds ratio, 95 % CI– 95% confidence interval.