Table 5.

Mixed effect logistic regression analysis of the effect of meteorological variables on the pregnancy probability (pregnancy vs. non-pregnancy)

Variable	uOR (CI)	P for uOR	aOR (CI)	P for aOR
Mean temperature (°C)
CYCL to OR	1.10(1.00–1.21)	NS	1.12(1.01–1.24)	0.04
OR to ER	1.13(1.02–1.24)	0.02	1.14(1.03–1.26)	0.01
Season
Winter	Reference		Reference
Spring	3.45(0.93–12.83)	NS	4.07(1.01–16.44)	0.049
Summer	8.12(1.62–40.72)	0.01	11.63(1.95–69.35)	0.01
Autumn	3.90(0.96–15.82)	NS	5.29(1.18–23.64)	0.03

uOR Odds ratio only adjusting random effect of ID, without other covariate adjustment.

aOR Odds ratio after adjusting random effect of ID, age, fertilization method, year of the cycle, gonadotropin dose and the grading of the transferred embryo

aOR Adjusted Odds ratio

CI Confidence interval

NS Non-significant