Table 3.
Adjusted Risk of vanishing twin syndrome
| Risk factors | Rate of vanishing twin syndrome at Less Than 20 wk | Unadjusted OR (95% CI) |
Adjusted ORa (95% CI) |
|---|---|---|---|
| Subchorionic hematoma | 2.23 (1.10–3.52) | 3.26 (1.11–4.61) | |
| Yes | 12.44 | ||
| No | 4.64 | ||
| Previous term delivery | 0.84 (0.53–1.32) | 0.75 (0.46–1.21) | |
| YES | 10.39 | ||
| NO | 8.84 | ||
| Previous miscarriage | 0.59 (0.37–0.93) | 0.63 (0.39–1.11) | |
| YES | 7.18 | ||
| NO | 11.66 | ||
| Conceived methods | 0.53 (0.33–0.97) | 0.57 (0.35–1.08) | |
| Natural conception | 11.62 | ||
| Assisted conception | 6.53 | ||
| Accompanied bleeding | 0.61 (0.38–0.97) | 0.84 (0.52–1.38) | |
| YES | 7.51 | ||
| NO | 11.82 |
Data are n/N (%) unless otherwise specified
a Final regression model included subchorionic hematoma, previous term delivery, previous miscarriage, conceived methods, and accompanied bleeding