Table 5. Distribution of the birth quartile according to the game position.
Position Quartile Total X2 df p V Odd-ratio
(CI 95%)
Q1
fr (%)		 Q2
fr (%)		 Q3
fr (%)		 Q4
fr (%)		 Q1-Q4 Q2-Q4 Q3-Q4
Total 1359
(33.2)		 1077
(26.3)		 895
(21.8)		 766
(18.7)		 4097 12.008 9 0.213 .031
Goalkeeper 145
(32.2)		 136
(30.2)		 99(22) 71
(15.7)		 451 31.115 3 .000*** .263 2.042
(2.038-2.046)		 1.915
(1.911-1.919)		 1.394
(1.391-1.397)
Defender 463
(34.3)		 364
(27.0)		 283
(21.0)		 240
(17.8)		 1350 85.716 3 .000*** .252 1.929
(1.928-1.931)		 1.517
(1.516-1.518)		 1.179
(1.178-1.180)
Midfielder 408
(33.9)		 302
(25.1)		 265
(22.0)		 228
(19.0)		 1203 60.099 3 .000*** .224 1.789
(1.789-1.789)		 1.325
(1.325-1.325)		 1.162
(1.162-1.162)
Forward 343
(31.4)		 275
(25.2)		 248
(22.7)		 227
(20.8)		 1093 27.977 3 .000*** .160 1.511
(1.510-1.512)		 1.211
(1.210-1.212)		 1.093
(1.093-1.094)
Note. Q= quartile; fr= frequency; %= percentage; X2=chi square; df =degrees of freedom; p= significance level; V= Cramer's V.
***p < 0.001.