Table 5.
Crude and adjusted odds ratios of confounding factors for clinical pregnancy in the first FET cycle.
| Variables | Crude OR (95% CI) | P-value | Adjusted OR (95% CI) | P-value |
|---|---|---|---|---|
| Age (years) | 0.010 | 0.011 | ||
| <30 | Reference | Reference | ||
| 30–34 | 1.46 (0.80–2.66) | 1.51 (0.82–2.78) | ||
| 35–37 | 1.66 (0.81–3.40) | 1.72 (0.84–3.53) | ||
| 38–40 | 1.06 (0.50–2.23) | 1.04 (0.49–2.21) | ||
| ≥41 | 0.26 (0.09–0.74) | 0.27 (0.10–0.80) | ||
| BMI (kg/m2) | 0.569 | – | ||
| <18.5 | 0.82 (0.39–1.72) | - | ||
| 18.5–24.9 | Reference | - | ||
| ≥25 | 0.70 (0.35–1.42) | - | ||
| AMH (ng/mL) | 0.161 | - | ||
| ≤ 1.43 | 0.55 (0.29–1.04) | - | ||
| 1.44–2.55 | 1.03 (0.55–1.92) | |||
| 2.56–4.35 | Reference | - | ||
| >4.35 | 0.69 (0.37–1.31) | - | ||
| MPA dose during COS (mg) | 0.939 | - | ||
| 4 | Reference | - | ||
| 10 | 1.02 (0.62–1.67) | - | ||
| No. of embryos transferred | 0.042 | - | ||
| 1 | Reference | - | ||
| 2 | 1.75 (1.02–3.02) | - | ||
| Endometrial preparation | 0.478 | - | ||
| Natural cycle | Reference | - | ||
| HRT | 0.85 (0.42–1.75) | - | ||
| Mild stimulation | 0.71 (0.39–1.28) | - | ||
| Endometrial thickness (mm) | 0.514 | - | ||
| <8 | 0.71 (0.35–1.45) | - | ||
| 8–11 | Reference | - | ||
| >11 | 1.10 (0.67–1.80) | - |
Adjusted ORs were adjusted for all covariates in the table using a binary logistic regression model through forward stepwise method. The −2 log likelihood = 405.58, and the Nagelkerke R2 = 0.069.