Table 4. Distribution of the birth quartile according to the season analysed.
Season 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 1.884 6 .930 0.015
2018-2019 453
(33.4)		 350
(25.8)		 309
(22.8)		 245
(18.1)		 1357 67.363 3 .000*** 0.223 1.849
(1.849-1.849)		 1.429
(1.429-1.429)		 1.261
(1.261-1.261)
2019-2020 451
(32.7)		 362
(26.3)		 300
(21.8)		 265
(19.2)		 1378 57.907 3 .000*** 0.205 1.702
(1.698-1.706)		 1.366
(1.363-1.369)		 1.132
(1.129-1.135)
2020-2021 455
(33.4)		 365
(26.8)		 286
(21.0)		 256
(18.8)		 1362 69.959 3 .000*** 0.227 1.777
(1.776-1.778)		 1.426
(1.425-1.427)		 1.117
(1.117-1.118)
Note. Q= quartile; fr= frequency; %= percentage; X2=chi square; df =degrees of freedom; p= significance level; V= Cramer's V.***p < 0.001.