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 6 Multiple logistic regression of clinical pregnancy by Treatment Group

Factors	OR (95% CI)	P
BMI	1.01 (0.99, 1.03)	0.370
Progesterone Day (E2)	1.00 (1.00, 1.00)	0.237
Progesterone Day (P)	0.94 (0.85, 1.04)	0.231
Age (Years)	0.98 (0.96, 1.00)	0.015*
Embryos Number	1.37 (1.18, 1.60)	< 0.001*
High Quality Embryo (Yes vs. No)	1.82 (1.25, 2.66)	0.002*
Treatment (GnRHa + HRT vs. NC)	1.45 (0.99, 2.11)	0.055
Treatment (HRT vs. NC)	1.21 (0.82, 1.77)	0.332
Treatment (Ovulation Induction vs. NC)	1.09 (0.72, 1.66)	0.679
Endometrial Morphology (A vs. C)	0.86 (0.71, 1.03)	0.108
Endometrial Morphology (B vs. C)	0.85 (0.68, 1.06)	0.148
Endometrial Thickness (mm)	1.02 (0.98, 1.06)	0.296

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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