Endometrial preparation methods prior to frozen embryo transfer: a retrospective cohort study comparing true natural cycle, ovulation induction, hormone replacement treatment and GnRHa pretreatment

Table 7 Multiple logistic regression of abortion by treatment group

Variable	OR (95% CI)	P
BMI	1.06 (1.02, 1.09)	0.002*
Progesterone Day (E2)	1.00 (1.00, 1.00)	0.391
Progesterone Day (P)	0.97 (0.81, 1.16)	0.714
Age (Years)	1.04 (1.01, 1.07)	0.017*
Embryos Number	1.04 (0.82, 1.33)	0.733
High Quality Embryo (Yes vs. No)	1.20 (0.63, 2.27)	0.579
Treatment (GnRHa + HRT vs. NC)	0.83 (0.46, 1.49)	0.527
Treatment (HRT vs. NC)	0.87 (0.48, 1.58)	0.655
Treatment (Ovulation Induction vs. NC)	0.68 (0.35, 1.35)	0.271
Endometrial Morphology (A vs. C)	0.77 (0.55, 1.07)	0.119
Endometrial Morphology (B vs. C)	1.20 (0.86, 1.68)	0.288
Endometrial Thickness (mm)	0.95 (0.89, 1.01)	0.072

OI ovulation induction, NC natural cycle, GnRHa+HRT GnRHa pretreatment, HRT hormone replacement Treatment. BMI body mass index. (*P<0.05)

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