Table 6. Distribution of the birth quartile according to the classification at the end of the season.
Classification 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 5.953 6 .428 .027
Four first places 285
(36.4)		 194
(24.8)		 159
(20.3)		 144
(18.4)		 782 61.366 3 .000*** .280 1.979
(1.973-1.986)		 1.347
(1.343-1.351)		 1.104
(1.101-1.107)
Mid-table classified 815
(32.1)		 675
(26.6)		 563
(22.2)		 485
(19.1)		 2538 97.125 3 .000*** .196 1.680
(1.679-1.681)		 1.392
(1.391-1.393)		 1.161
(1.160-1.162)
Four last places 259
(33.3)		 208
(26.8)		 173
(22.3)		 137
(17.6)		 777 41.754 3 .000*** .232 1.891
(1.891-1.891)		 1.518
(1.518-1.518)		 1.263
(1.263-1.263)
Note. Q= quartile; fr= frequency; %= percentage; X2=chi square; df =degrees of freedom; p= significance level; V= Cramer's V.***p < 0.001.