Table 2
Diagnostic accuracy and predictive value for CTCA
| Pretest probability | No | TP | FP | TN | FN | Sens | Spec | PPV | NPV | Accuracy | +LR | −LR | |
| Per patient | 42 | 23 | 2 | 17 | 0 | 100 | 90 | 92 | 100 | 95 | 9.50 | 0 | |
| Low | 16 | 7 | 3 | 1 | 3 | 0 | 100 | 75 | 75 | 100 | 86 | 4.00 | 0 |
| Intermediate | 52 | 22 | 13 | 0 | 9 | 0 | 100 | 100 | 100 | 100 | 100 | NA | 0 |
| High | 87 | 13 | 7 | 1 | 5 | 0 | 100 | 83 | 100 | 88 | 92 | 6.00 | 0 |
| Per vessel | – | 168 | 49 | 6 | 110 | 3 | 94 | 95 | 89 | 95 | 95 | 18.22 | 0.06 |
| Low | – | 28 | 7 | 3 | 17 | 1 | 88 | 85 | 70 | 94 | 86 | 5.83 | 0.15 |
| Intermediate | – | 88 | 28 | 2 | 57 | 1 | 97 | 97 | 93 | 98 | 97 | 28.48 | 0.04 |
| High | – | 52 | 14 | 1 | 36 | 1 | 93 | 97 | 93 | 97 | 96 | 34.53 | 0.07 |
-
FN, false negative; FP, false positive; LR, likelihood ratio; NA, not available; NPV, negative predictive value; PPV, positive predictive value; Sens, sensitivity; Spec, specificity; TN, true negative; TP, true positive.
