Effects of seasonal variations and meteorological factors on IVF pregnancy outcomes: a cohort study from Henan Province, China

Table 3 Logistic regression assessment of pregnancy outcomes

	Biochemical pregnancy rate			Clinical pregnancy rate			Early abortion rate			Live birth rate
	P	OR	95% CI	P	OR	95% CI	P	OR	95% CI	P	OR	95% CI
Season		0.115			0.019			0.564			0.189
Winter		1.00	(Reference)		1.00	(Reference)		1.00	(Reference)		1.00	(Reference)
Spring	0.313	1.173	(0.860,1.598)	0.135	1.253	(1.932,1.684)	0.413	1.217	(0.761,1.946)	0.131	1.199	(0.948,1.517)
Summer	0.016	1.495	(1.078,2.072)	0.002	1.643	(1.203,2.243)	0.179	1.382	(0.862,2.217)	0.052	1.273	(0.998,1.624)
Autumn	0.369	1.163	(0.836,1.618)	0.276	1.190	(0.870,1.627)	0.713	1.100	(0.663,1.824)	0.196	1.179	(0.919,1.512)
Meteorological factors
Daily average temperature (°C)	0.133	1.008	(0.997,1.020)	0.031	1.012	(1.001,1.022)	0.226	1.010	(0.994,1.027)	0.142	1.006	(0.998,1.015)
Daily average humidity (%)	0.619	1.001	(0.996,1.007)	0.228	1.003	(0.998,1.009)	0.430	1.003	(0.995,1.012)	0.462	1.002	(0.997,1.006)
Sunshine duration (hr)	0.961	0.999	(0.973,1.027)	0.270	0.986	(0.961,1.011)	0.945	0.999	(0.960,1.038)	0.198	0.987	(0.967,1.007)

Reference, this variable functions as an indicator
Biochemical pregnancy adjusted by basal luteinizing hormone level, basal anti-Mullerian hormone (AMH) level, antral follicle count, total dosage of gonadotropin (Gn) used, number of 2PN fertilization, number of 2PN cleavage; clinical pregnancy adjusted by duration of infertility, basal AMH level, total dosage of Gn used, and number of 2PN cleavage; early abortion adjusted by duration of infertility; live birth adjusted by age and duration of infertility
OR odds ratio, CI confidence interval, hr hours

ISSN: 1477-7827