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Table 1 Baseline characteristics of the three study groups

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

  Group A: Group B: Group C: P
E2 ≤ 30 pg/ml 30 < E2 ≤ 50 pg/ml E2 > 50 pg/ml
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
  1. Data are presented as median (interquartile range), and examined by Kruskal-Wallis test
  2. FSH follicle-stimulating hormone
  3. *Indicates significant difference between group A and given group, P < 0.017
  4. **Indicates significant difference between group B and group C, P < 0.017