Table 2. Controlled ovarian stimulation, proportion of developed follicles and oocytes recovered according to patients' BMI
	Normal	Overweight	Obese	P
Antral follicles number	11.6±5.4	12.5±5.5	12.2±5.7	0.50
Days of ovarian stimulation	7.5±1.4	7.6±1.1	7.8±1.3	0.56
Gonadotropin dose used (IU)	2043±489	1940±536	2109±605	0.66
Maximum estradiol value (pg/ml)	1560±610	1511±635	1190±466	0.02
Developed/antral follicles	81%	76%	70%	<0.0001
Recovered oocytes/developed follicles	91%	90%	84%	0.0017
mature/recovered oocytes	82%	82%	77%	0.26
Data expressed as mean ± standard deviation, or as percentages. Kruskal-Wallis test or Chi-square test - statistically significant if P<0.05.