GNRH1 and Infertility: After the PSM model, the baseline characteristics, including maternal age (P=0.23), BMI (P=0.16), duration of infertility (P=0.64), type of infertility (P=0.11), infertility diagnosis (P=0.23), basal serum FSH level (P=0.41), AMH (P=0.24), AFC (P=0.13) and method of ART (P=0.78), were comparable between the PPOS and GnRH antagonist groups.