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Table 3 Clinical pregnancy rates per cycle according to method applied for timing insemination or intercourse (hCG-only, hCG plus LH-surge or LH-surge-only) among the different ovarian stimulation protocols. Results are expressed as rate (number of pregnancy cycles/total number of cycles).

From: Human chorionic gonadotropin administration is associated with high pregnancy rates during ovarian stimulation and timed intercourse or intrauterine insemination

  HCG-only (group 1) hCG + LH-surge (group 2) LH-surge-only (group 3) All Cycles
All stimulation cycles 10.2% (109/1068) 14.3% (69/483) 2% (5/256) 10.7% (183/1707)
CC 6.3% (34/539) 15.9% (20/126) 1.9% (2/106) 7.3% (56/771)
CC+FSH 15% (16/108) 30% (6/20) 0 (0/4) 16.7% (22/132)
Letrozole 9% (6/66) 20.3% (14/69) 9% (1/11) 14.4% (21/146)
Letrozole+FSH 17% (14/82) 17.2% (8/58) 0 (0/3) 17.5% (22/143)
FSH 14% (39/273) 10% (21/210) 6.3% (2/32) 12.2% (62/515)
No medication 6.5% (5/78) 12.7% (8/65) 8.8% (13/150) 8.9% (26/293)