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Table 1 Baseline characteristics in fresh ET and FET groups

From: Fertility outcomes in women after controlled ovarian stimulation with gonadotropin releasing hormone agonist long protocol: fresh versus frozen embryo transfer

Characteristics Fresh ET (n = 5216) FET (n = 2598) P
Age at egg retrieval (year) 29.55 ± 2.86 28.96 ± 2.99 < 0.001
BMI (kg/m2) 21.80 ± 2.74 21.74 ± 2.91 0.083
Infertility duration (year) 4.64 ± 3.07 4.43 ± 2.88 0.021
AMH (ng/ml) 3.26 ± 2.54 5.58 ± 3.64 < 0.001
Basal FSH (mIU/ml) 5.64 ± 0.03 5.04 ± 0.03 < 0.001
Primary infertility, n (%) 2522 (48.4) 1326 (51.0) 0.044
Primary cause of infertility    < 0.001
 Pelvic and tubal factor, n (%) 4236 (70.2) 2040 (61.5)  
 Male, n (%) 645 (12.4) 401 (15.4)  
 Unexplained, n (%) 234 (4.5) 125 (4.8)  
 Ovulatory obstacle, n (%) 37 (6.5) 14 (13.4)  
 Endometriosis, n (%) 60 (6.4) 18 (4.8)  
  1. Note: Presented as n (%) for categoric variables and mean SD for continuous variables. BMI body mass index; AMH Anti-Mullerian Hormone; FSH Follicle-Stimulating Hormone; FET frozen embryo transfer; fresh ET fresh embryo transfer