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Table 1 Demographic characteristics of patients younger than 35 years old who did not undergo preimplantation genetic screening

From: Optimal parameters for determining the LH surge in natural cycle frozen-thawed embryo transfers

Characteristic Group A (n = 270) Group B (n = 137) P value
Age (years) 32 [30–33] 32 [31–33] 0.08
Parity 1 [0–1] 0 [0–1] <0.001
BMI (kg/m2) 23 [20.9–25.4] 21.6 [20.4–23.9] 0.01
  < 18.5 4.8% 8.0% 0.26
 18.5–29.9 85.5% 83.3% 0.56
  ≥ 30 9.6% 8.7% 0.85
Peak endometrial thickness (mm) 8.7 [7.8–9.9] 8.6 [7.8–9.7] 0.79
Number of transferred embryos 1 (1–2] 1 [1–2] 0.49
Progesterone level on the day of the defined LH surge 0.8 [0.7–1.0] 1.0 [0.8–1.2] <0.001
Blastocyst grading    
 Excellent 0.4% 0.7% 1.0
 Good 6.9% 8.6% 0.54
 Average 79.5% 74.8% 0.35
 Poor 13.1% 15.7% 0.52
Infertility diagnosis    
 Male factor 40.3% 43.7 0.52
 Ovulatory dysfunction 4.8% 3.6% 0.79
 Diminished ovarian reserve 5.9% 6.5% 0.82
 Tubal 11.1% 8.0% 0.38
 Endometriosis 4.4% 5.1% 0.80
 Uterine 1.1% 2.1% 0.40
 Idiopathic 14.1% 14.5% 0.26
 Other 18.1% 16.0% 0.48
Number of blastocysts cryopreserved 3 [0–5] 3 [2–5] 0.83
% IVF-ICSI 77.4% 76.6% 0.90
  1. BMI: Body mass index. IVF-ICSI: in vitro fertilization with intracytoplasmic sperm injection. Values were expressed as median [interquartile range]