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 8 Multiple logistic regression of live birth by treatment group

Variable	OR (95% CI)	P
BMI	0.99 (0.97, 1.01)	0.338
Progesterone Day (E2)	1.00 (1.00, 1.00)	0.142
Progesterone Day (P)	0.95 (0.86, 1.05)	0.326
Age (Years)	0.97 (0.95, 0.99)	< 0.001*
Embryos Number	1.33 (1.15, 1.55)	< 0.001*
High Quality Embryo (Yes vs. No)	1.70 (1.15, 2.52)	0.008*
Treatment (GnRHa + HRT vs. NC)	1.56 (1.06, 2.30)	0.024*
Treatment (HRT vs. NC)	1.31 (0.88, 1.94)	0.178
Treatment (Ovulation Induction vs. NC)	1.29 (0.84, 1.98)	0.243
Endometrial Morphology (A vs. C)	0.91 (0.75, 1.10)	0.326
Endometrial Morphology (B vs. C)	0.80 (0.64, 0.99)	0.043*
Endometrial Thickness (mm)	1.04 (1.00, 1.08)	0.028*

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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