The pregnancy rate per cycle was 15.1% in the letrozole group and 17.9% in the clomiphene citrate group without statistically difference between the groups.

• 在来曲唑治疗组，每个周期的妊娠率为 15.；1%25 ，在克罗米芬治疗组，每个周期的妊娠率为 17