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Table 3 Diagnostic value of the variables found to be predictive of haemoperitoneum ≥ 300 ml at univariate analysis at their best cut-off point

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

Variable Patients with the characteristic Se(%) Sp(%) LR + LR - p-value*
Vaginal bleeding absent 26 37.5 80.5 1.92 0.78 0.063
Any pelvic pain 82 100.0 17.1 1.21 0.00 0.003
Moderate to severe pelvic pain 65 91.5 48.8 1.8 0.2 <0.001
Systolic blood pressure < 100 mm Hg 12 20.8 95.1 4.27 0.83 0.0215
Hb < 10 g/dl 15 29.2 97.6 11.9 0.73 0.001
Serum hCG < 5000 IU/L 66 83,3 36,6 1,31 0,46 0,032
Any fluid in the pouch of Douglas at TVUS 74 91.7 26.8 1.25 0.31 0.020
Fluid > uterine isthmus at TVUS 52 81.3 68.3 2.56 0.27 <0.001
Fluid > uterine fundus at TVUS 18 31.1 92.7 4.27 0.74 0.005
Fluid arround the ovary at TVUS 9 16.7 97.6 6.83 0.85 0.027
Fluid > uterine fundus OR fluid arround the ovary at TVUS 24 43.8 92.7 5.98 0.61 <0.001
Fluid height ≥ 11 mm at TVUS 65 85.1 39.0 1.40 0.38 0.010
Fluid Width ≥ 20 mm at TVUS 66 89.4 41.5 1.53 0.26 0.001
Clots present at TVUS 47 72.9 70.7 2.5 0.4 <0.001
  1. Hb = Serum haemoglobin concentration. LR + = positive likelihood ratio. LR - = negative likelihood ratio. Se = sensitivity. Sp = specificity. TVUS = transvaginal ultrasound examination.
  2. * Chi square for heterogeneity.