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Table 4 Independent predictors of haemoperitoneum ≥ 300 ml using multiple regression analysis

From: Ultrasound assessment of haemoperitoneum in ectopic pregnancy: derivation of a prediction model

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
  1. Hb = Serum haemoglobin concentration. Adj. OR = Adjusted Odds Ratio. CI = confidence interval. Ref. = reference class for the variable.
  2. * The variable Serum hCG < 5000 was introduced in the model in order to avoid confusion bias