Table 2.

Ovarian endometrial response and pregnancy outcome

Variable	Letrozole (n = 70)	Clomiphene + hMG (n = 70)	P value
Days of hCG administration	11.5 ± 1.3	11.7 ± 1.1	NS
No. follicles > 18 mm on day of hCG	1.8 ± 0.7	2.46 ± 2.3	0.042
Peak E2 (pg/ml)	310 ± 135.14	1270 ± 760	<0.0001a
Endometrial thickness (mm)	9.7 ± 1.6	7.8 ± 2	<0.001a
Pregnancy rate (%)	23 (32.8%)	10 (14.3%)	<0.01b

Values are mean ± SD.

hMG human menopausal gonadotropin, hCG human chorionic gonadotropin, NS not significant

^aAnalyzed by t test

^bAnalyzed by χ² test