Table 3.

Birthdate female players’ distribution (n y %) by trimester (T) according to the competition category and the playing position

YOUTH CATEGORY (U-18)
	T1	T2	T3	T4	T5	T6	T7	T8
P.P.	n	n	n	n	n	n	n	n	$x^2$	df	p	Vc
	(%)	(%)	(%)	(%)	(%)	(%)	(%)	(%)
Gk	17 (30.9)	9 (16.4)	6 (10.9)	9 (16.4)	4 (7.3)	4 (7.3)	5 (9.1)	1 (1.8)	24.93	7	0.001	0.67
W	19 (21.3)	14 (15.7)	12 (13.5)	11 (12.4)	17 (19.1)	9 (10.1)	5 (5.6)	2 (2.2)	21.30	7	0.003	0.49
B	25 (22.7)	13 (11.8)	14 (12.7)	9 (8.2)	16 (14.5)	7 (6.4)	13 (11.8)	13 (11.8)	15.16	7	0.034	0.37
CB	19 (31.1)	13 (21.3)	10 (16.4)	4 (6.6)	7 (11.5)	5 (8.2)	3 (4.9)	0 (0)	23.26	6	0.001	0.62
P	16 (29.6)	9 (16.7)	7 (13.0)	5 (9.3)	4 (7.4)	5 (9.3)	4 (7.4)	4 (7.4)	18.01	7	0.012	0.58
JUNIOR CATEGORY (U-20)
	T1	T2	T3	T4	T5	T6	T7	T8
P.P.	n	n	n	n	n	n	n	n	$x^2$	df	p	Vc
	(%)	(%)	(%)	(%)	(%)	(%)	(%)	(%)
Gk	16 (30.2)	6 (11.3)	2 (3.8)	4 (7.5)	8 (15.1)	6 (11.3)	3 (5.7)	8 (15.1)	21.02	7	0.004	0.63
W	13 (16.7)	9 (11.5)	14 (17.9)	12 (15.4)	6 (7.7)	7 (9.0)	7 (9.0)	10 (12.8)	6.44	7	0.490	0.29
B	17 (18.9)	7 (7.8)	11 (12.2)	11 (12.2)	13 (14.4)	14 (15.6)	12 (13.3)	5 (5.6)	9.29	7	0.233	0.32
CB	14 (25.9)	2 (3.7)	10 (18.5)	6 (11.1)	8 (14.8)	4 (7.4)	7 (13.0)	3 (5.6)	16.32	7	0.022	0.55
P	12 (22.6)	6 (11.3)	4 (7.5)	7 (13.2)	5 (9.4)	11 (20.8)	7 (13.2)	1 (1.9)	13.95	7	0.052	0.51
SENIOR CATEGORY
	T1	T2	T3	T4	T5	T6	T7	T8
P.P.	n	n	n	n	n	n	n	n	$x^2$	df	p	Vc
	(%)	(%)	(%)	(%)	(%)	(%)	(%)	(%)
Gk	(32.718 )	(18.210 )	(29.116 )	(20.011 )	-	-	-	-	3.39	3	0.335	0.25
W	(28.125 )	(30.327 )	(22.520 )	(19.117 )	-	-	-	-	3.01	3	0.391	0.18
B	(25.430 )	(33.940 )	(21.225 )	(19.523 )	-	-	-	-	6.10	3	0.107	0.23
CB	(23.917 )	(22.516 )	(38.027 )	(15.511 )	-	-	-	-	7.46	3	0.059	0.32
P	(22.715 )	(30.320 )	(22.715 )	(24.216 )	-	-	-	-	1.07	3	0.785	0.13

Notes: T1-T4/T8 = birth trimester; P.P. = playing position; Gk = goalkeeper; W = wing; B = back; CB = centre-back; P = pivot; n = absolute frequency; % = relative frequency; $x^2=$ chi square; df = degrees of freedom; p = level of significance; Vc = Cramer’s V