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 4 Multiple logistic regression of HCG by treatment group

factors	OR (95% CI)	P
BMI	1.01 (0.99, 1.04)	0.309
Progesterone Day (E2)	1.00 (1.00, 1.00)	0.091
Progesterone Day (P)	0.93 (0.84, 1.02)	0.140
Age (Years)	0.97 (0.96, 0.99)	0.007*
Embryos Number	1.37 (1.17, 1.61)	< 0.001*
High Quality Embryo (Yes vs. No)	1.62 (1.10, 2.37)	0.014*
Treatment (GnRHa + HRT vs. NC)	1.28 (0.86, 1.90)	0.220
Treatment (HRT vs. NC)	1.09 (0.73, 1.62)	0.678
Treatment (Ovulation Induction vs. NC)	0.89 (0.58, 1.38)	0.613
Endometrial Morphology (A vs. C)	0.84 (0.69, 1.03)	0.099
Endometrial Morphology (B vs. C)	0.87 (0.69, 1.10)	0.252
Endometrial Thickness (mm)	1.03 (0.99, 1.08)	0.117

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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