Table 2 Performance of different scores in predicting pulmonary embolism (PE). All values are given with 95% confidence intervals, except counts. These are shown as n (%). AAD (age-adjusted D-dimer), CTPA (computed tomography pulmonary angiogram)

Sensitivity

0.978 [0.935,1.00]

0.800

0.957

0.979

0.956

0.911

Specificity

0.031 [0.011,0.050]

0.371

0.167

0.024

0.169

0.192

Positive predictive value

0.148 [0.110,0.185]

0.180

0.165

0.147

0.165

0.163

Negative predictive value

0.888 [0.693,1.00]

0.915

0.958

0.868

0.957

0.926

Correct rule-out (CTPA/scintigraphy avoided)

9.00 (2,65%)

85.00 (32.20%)

47.00 (14.33%)

7.00 (2.03%)

50.00 (14.71%)

55.00 (16.57%)

False rule-out (PEs missed) n (%)

1.00 (0.29%)

7.00 (2.65%)

2.00 (0.61%)

1.00 (0.29%)

2.00 (0.59%)

4.00 (1.2%)

Accuracy

0.1559 [0.119,0.1989]

0.428 [0.3676,0.4901]

0.2805 [0.2325,0.3325]

0.1565 [0.1198,0.1992]

0.2735 [0.2268,0.3242]

0.2892 [0.241,.03412]

Area under the curve (AUC)

0.723 [0.634,0.811]

0.715 [0.614, 0.816]

0.705 [0.604, 0.807]

0.711 [0.609, 0.812]

0.741 [0.654,0.827]