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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.