Diagnostic accuracy for the detection of concealed packages
| All CT scans (n=84) | CT scans<15 packages concealed (n=64) | |
|---|---|---|
| True positive | 25 | 25 |
| False positive | 8 | 2 |
| False negative | 15 | 1 |
| True negative | 36 | 36 |
| Sensitivity % (95% CI) | 63 (46 to 77) | 96 (80 to 99) |
| Specificity % (95% CI) | 82 (67 to 92) | 95 (82 to 99) |
| PPV % (95% CI) | 76 (58 to 89) | 93 (76 to 99) |
| NPV % (95% CI) | 71 (56 to 83) | 97 (86 to 100) |
NPV, negative predictive value; PPV, positive predictive value.