Table 4. Quarterly distribution (Q) of the dates of birth of the players and odd ratio in relation to the subgroups according to the position of play in the field.
Game
Position		 Quarterly (Q) Odd-ratio (CI 95%)
Q1 Q2 Q3 Q4 Total X2* gl†  p‡ V§ Q1-Q4 Q2-Q4 Q3-Q4
Total 1641
(31.6)		 1339
(25.7)		 1244
(23.9)		 977
(18.8)		 5201 11.489 9 .244 .03
Goalkeeper 197
(31.1)		 172
(27.1)		 139
(21.9)		 126
(19.9)		 634 19.565 3 .000 0.18 1.565
(1.496-1.637)		 1.365
(1.323-1.408)		 1.103
(1.092-1.114)
Defender 522
(31.5)		 424
(25.6)		 408
(24.6)		 305
(18.4)		 1658 57.083 3 .000 0.19 1.711
(1.680-1.743)		 1.390
(1.374-1.406)		 1.338
(1.325-1.351)
Midfielder 604
(33.5)		 457
(25.3)		 428
(23.7)		 316
(17.5)		 1805 93.515 3 .000 0.23 1.911
(1.885-1.937)		 1.446
(1.435-1.457)		 1.354
(1.345-1.363)
Forward 318
(28.8)		 286
(26)		 269
(24.4)		 230
(20.9)		 1102 14.675 3 .000 0.12 1.383
(1.324-1.444)		 1.243
(1.207-1.280)		 1.170
(1.146-1.195)
* X2=chi square
†  gl = degrees of freedom
‡ p = level of significance
§ V = Cramer´s V