Table 1.

Characteristics of the IVF cycles for patients co-treated with letrozole compared to the control group

	Control group	Letrozole	P
N	87	87
Age (years)	37.0 ± 3.8	36.5 ± 4.1	NS
Length of stimulation (days)	11.1 ± 2.1	10.2 ± 1.7	<0.01
Total dose of gonadotropins (IU)	3012 ± 1115	3316 ± 1037	NS
Follicles >15 mm at the trigger day	7.9 ± 5.3	10 ± 5.8	0.02
E2(pmol/L)	6760 ± 4792	2420 ± 1923	<0.01