Table 3.
Unadjusted and adjusted odd ratios of placental developmental abnormalities in different cycles of frozen embryo transfer.
| Naturally conceived | Frozen embryo transfers | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Reference group | Modified natural cycle | Programmed cycle | |||||||
| Variables | (n=1334) | (n=217) | (n=635) | ||||||
| unadjusted | adjusted | unadjusted | adjusted | ||||||
| OR (95%CI) | P-value | OR (95%CI) | P-value | OR (95%CI) | P-value | OR (95%CI) | P-value | ||
| Abnormal placental morphology | 14.39 (4.39-47.14) | <0.001 | 4.35 (4.14-6.84) | 0.148 | 8.60 (2.86-25.81) | <0.001 | 5.27 (2.00-16.44) | 0.002 | |
| Abnormal placental thickness | / | 0.140 | / | 0.986 | / | / | / | / | |
| Abnormal placental position | 3.39 (1.34-8.59) | 0.016 | 3.83 (3.03-7.21) | 0.143 | 3.48 (1.73-6.99) | <0.001 | 3.84 (1.82-8.52) | <0.001 | |
| Abnormal placental attachment | 2.84 (1.28-6.33) | 0.016 | 2.53 (2.08-4.73) | 0.318 | 8.80 (5.32-14.55) | <0.001 | 8.67 (5.24-14.98) | <0.001 | |
| Intraplacental hematoma | 1.0 (0.99-1.00) | 1.000 | / | 0.973 | 1.26 (0.30-5.30) | 1.000 | 0.51 (0.07-2.44) | 0.427 | |
| Abnormal placental development | 4.19 (2.51-6.99) | <0.001 | 1.16 (1.31-7.01) | 0.879 | 6.80 (4.71-9.83) | <0.001 | 5.36 (3.63-8.05) | <0.001 | |
Adjusted for: maternal age, parity.