The association of serum estradiol level with outcomes of clomiphene citrate/human menopausal gonadotropin ovarian stimulation for in vitro fertilization and embryo transfer

Table 1 Baseline characteristics of the three study groups

	Group A:	Group B:	Group C:	P
	E₂ ≤ 30 pg/ml	30 < E₂ ≤ 50 pg/ml	E₂ > 50 pg/ml	P
Number of cycles	316	451	313
Age, years	34 (31, 38)	35 (31, 39)	35 (31, 40)*	0.049
Body mass index, kg/m²	21.2 (19.9, 23.3)	21.4 (20, 23.1)	20.8 (19.5, 22.2)* **	0.008
Duration of infertility, years	5 (3, 9)	5 (3, 8)	5 (3, 8)	0.809
Number of past ovarian stimulation cycles	2 (1, 3)	2 (1, 3)	2 (1, 2)	0.487
Number of past embryo transfers	2 (1, 3)	2 (1, 2)	1 (1, 2)	0.146
Baseline FSH, IU/L	8.6 (7.1, 10.7)	8.7 (7.1, 11.1)	8.9 (7.3, 11.8)	0.353
Baseline E₂, pg/mL	33 (24, 45)	38.5 (29, 50.5)*	48 (33, 62)* **	<0.001

Data are presented as median (interquartile range), and examined by Kruskal-Wallis test
FSH follicle-stimulating hormone
*Indicates significant difference between group A and given group, P < 0.017
**Indicates significant difference between group B and group C, P < 0.017

ISSN: 1477-7827