Results
Out of 382 women who met the selection criteria, 184 women used the PPOS protocol and 198 women used the antagonist protocol. One woman in the PPOS group and one woman in the antagonist group had premature ovulation. Oocytes were not obtained in two women in the antagonist group. No transferrable embryos were available in 13 women in the PPOS group and 25 women in the antagonist group. During the study period, 26 women in the PPOS group and 47 women in the antagonist group did not undergo FET. Therefore, 144 women in the PPOS group and 123 women in the antagonist group completed their first FET and were included for analysis (Figure1).