Table 3.

Logistic regression analysis of the effect of season on the pregnancy probability

Variable	uOR (CI)	P for uOR	aOR (CI)	P for aOR
Season
Winter	Reference		Reference
Spring	1.24(0.83–1.86)	NS	1.16(0.76–1.75)	NS
Summer	1.57(1.05–2.34)	0.03	1.47(0.97–2.23)	NS (0.07)
Autumn	1.80(1.18–2.74)	0.01	1.73(1.12–2.68)	0.02

uOR unadjusted odds ratio

aOR odds ratio after adjusting age, fertilization method, year of the cycle, gonadotropin dose and the grading of the transferred embryo

CI Confidence interval

NS Non-significant