Incidence and risk factors for early pregnancy loss in women with first pregnancy undergoing in vitro fertilization-embryo transfer

Table 3 Multivariate logistic regression analyses for EPL among first pregnancy patients in IVF cycles

Variables	OR	95%CI	P
Female age, years			< 0.001
< 35	1.00
≧35, < 40	1.28	0.91–1.78	0.16
≧40	3.97	2.80–7.55	< 0.001
Female BMI, kg/m²			0.09
≧18.5, < 25	1.00
< 18.5	1.07	0.71–1.59	0.76
≧25	1.32	1.03–1.70	0.029
Cycle type
Fresh	1.00
Frozen-thaw	1.59	1.11–2.27	0.011
Thickness of endometrium, mm^a
≥7/8
< 7/8	1.84	1.01–3.33	0.046
Number of embryos transferred
1	1.00
≥2	0.67	0.50–0.90	0.008
Tubal factor
No	1.00
Yes	0.72	0.53–0.98	0.038

EPL early pregnancy loss, IVF in vitro fertilization, OR odds ratio, CI confidence interval, BMI body mass index
^a For fresh IVF-ET cycles, thickness of endometrium was divided into two groups with a 8 mm boundary; for frozen-thaw -ET cycles, thickness of endometrium was divided into two groups with a 7 mm boundary

ISSN: 1471-2393