Table 4.
Independent predictors of haemoperitoneum ≥ 300 ml using multiple regression analysis
| Variables | Adj. OR* | 95% CI |
| Hb < 10 g/dL | ||
| No | 1 | Ref. |
| Yes | 20.0 | 1.9–214.1 |
| Spontaneous pelvic pain | ||
| None to mild | 1 | Ref. |
| Moderate to severe | 11.5 | 2.3–57.2 |
| Fluid > uterine fundus OR fluid around the ovary at TVUS | ||
| No | 1 | Ref. |
| Yes | 12.9 | 2.5–65.5 |
Hb = Serum haemoglobin concentration. Adj. OR = Adjusted Odds Ratio. CI = confidence interval. Ref. = reference class for the variable.
* The variable Serum hCG < 5000 was introduced in the model in order to avoid confusion bias