Table 4 Crude and adjusted odds ratio (OR) for timing of initial frozen embryo transfer (FET) after a failed fresh IVF-ET attempt and other potential confounders for ongoing pregnancy
Variable | Crude OR (95% CI) | Adjusted OR (95% CI) |
|---|---|---|
Timing of initial FET | ||
 Immediate | Reference | Reference |
 Delayed | 0.78 (0.55 to 1.05) | 0.68 (0.47 to 0.99) |
Female age | ||
  < 35 yrs | Reference | Reference |
  ≥ 35 yrs | 0.77 (0.52 to 1.12) | 0.87 (0.58 to 1.31) |
Anti-müllerian hormone (AMH) | ||
  < 1.2 ng/ml | Reference | Reference |
  ≥ 1.2 ng/ml | 1.12 (0.68 to 1.83) | 1.20 (0.71 to 2.03) |
Body mass index (BMI) | ||
  < 24 kg/m2 | Reference | Reference |
  ≥ 24 kg/m2 | 0.67 (0.48 to 0.94) | 0.62 (0.43 to 0.89) |
Basic FSH | ||
  < 10 UI/L | Reference | Reference |
  ≥ 10 UI/L | 0.84 (0.56 to 1.26) | 0.90 (0.58 to 1.40) |
Antral follicle count (AFC) | ||
  < 10 | Reference | Reference |
  ≥ 10 | 1.31 (0.94 to 1.83) | 1.49 (1.05 to 2.12) |
No of oocytes retrieved | ||
  ≤ 9 | Reference | Reference |
  > 9 | 1.25 (0.86 to 1.82) | 1.33 (0.88 to 2.02) |
Method of fertilization | ||
 IVF | Reference | Reference |
 ICSI | 0.61 (0.43 to 0.87) | 0.65 (0.45 to 0.95) |
No of transferred frozen thawed embryos | ||
 Single | Reference | Reference |
 Double | 1.68 (0.92 to 3.08) | 1.33 (0.70 to 2.53) |
Endometrial thickness before FET | 1.09 (0.99 to 1.19) | 1.05 (0.95 to 1.16) |
Moderate/severe depression prior to FET | ||
 No | Reference | Reference |
 Yes | 0.75 (0.40 to 1.39) | 0.70 (0.36 to 1.36) |
High stress level prior to FET | ||
 No | Reference | Reference |
 Yes | 0.27 (0.17 to 0.43) | 0.28 (0.17 to 0.45) |