miscarriage, infertility, abortion
REGRESSION, MISCARRIAGE
Subgroups analysis was performed on the basis of clinical pregnancy rate. Odd ratios (OR) were presented to assess the efficacy. Adjusted OR were calculated using logistic regression. Subgroup analysis was performed according to baseline characteristics and cycle response details, including age, BMI, infertility type, cause of infertility, live birth history, artificial abortion history, miscarriage history, IVF history, ovulation-inducing protocol and endometrial thickness. We set 35 years old as the cutoff value for women of advanced age (Intention-to-treat (ITT) and per-protocol (PP) strategies were employed during data analyzes. For PP analysis, patients were excluded for the following reasons, drop-out or deviation to the study protocol (188 in ZYP group, 193 in placebo group), cancellation of fresh ET (314 in ZYP group, 342 in placebo group).Categorical variables were presented as counts and proportions, and compared with χ