Controlled ovarian hyperstimulation (COH) was started on the 2nd day of menstruation using human menopausal gonadotrophin (HMG) (Merional® IBSA, Switzerland). The initial dose ranged between 150-300 IU/day. The COH drug dose was adjusted according to the patient's response guided by number and size of the follicles in addition to serum E2 values. COH was continued until at least 3 follicles ≥17mm were obtained. This was followed by the administration of Human chorionic gonadotrophin (HCG) (Choriomon®, IBSA, Switzerland) 10000 IU. On the day of HCG administration, ovarian ultrasound scan will be performed using a transvaginal probe and the Preovulatory follicle count (PFC) was assessed, (PFC) was defined as number of follicles measuring≥16mm. FSI will be calculated as (FSI =PFC*10000/AFC*Total dose of FSH) Oocyte retrieval was guided by transvaginal ultrasound and was done 34-36 hours following HCG administration. Fertilization was done by ICSI. 16-18 hours later, fertilization was confirmed by the presence of 2 pronuclei.