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Table 1 Patients’ baseline characteristics

From: Progesterone elevation on the day of human chorionic gonadotropin administration adversely affects the outcome of IVF with transferred embryos at different developmental stages

Parameter Day 3 ET Day 5 ET
  (n = 10,864) (n = 1146)
Age (years) 31.3 ± 5.1 29.7 ± 4.5
BMI (kg/m2) 22.0 (3.0) 22.0 (4.5)
bFSH (IU/L) 7.16 (2.5) 6.57 (2.0)
Duration of infertility (years) 3 (4) 3 (3)
Primary infertility (%) 49.2 55.2
Second infertility (%) 50.8 44.8
First treatment cycle (%) 84.3 88.1
Cause of infertility (%)   
tubal pathology 44.5 58.5
male factors 27.5 29.8
advanced age (≥35 years) 11.1 14.6
PCOS 6.2 11.5
endometriosis 3.5 3.3
pelvic pathology 6.5 6.5
others 3.8 4.1
unexplained factors 13.3 11.2
ART (%)   
IVF 69.8 72.2
ICSI 28.8 25.6
IVF + ICSI 1.4 2.2
Stimulation protocol (%)   
GnRH-a long protocol 82.8 93.5
GnRH-a prolonged (modified) protocol 11.1 5.8
  1. Note: ART: assisted reproductive technology; IVF + ICSI: IVF + rescue ICSI or IVF + late ICSI; GnRH-a: gonadotropin-releasing hormone agonist; PCOS: polycystic ovary syndrome