Table 3.
Diagnostic performance of US and CT
| Probability of appendicitis according to AAS | Sensitivity | Specificity | LR+ | LR- | DOR |
|---|---|---|---|---|---|
| US | |||||
| All patients | 48.6% | 94.4% | 8.646 | 0.545 | 15.86 |
| High (AAS ≥16) | 46.3% | 90.9% | 5.098 | 0.590 | 8.636 |
| Intermediate (AAS 11–15) | 48.4% | 95.6% | 10.971 | 0.540 | 20.291 |
| Low (AAS ≤10) | 47.1% | 93.5% | 7.274 | 0.566 | 12.848 |
| CT | |||||
| All patients | 98.4% | 92.2% | 12.615 | 0.017 | 742.06 |
| High (AAS ≥16) | 100.0% | 95.8% | 23.98 | 0 | Infinite |
| Intermediate (AAS 11–15) | 97.8% | 90.6% | 10.385 | 0.024 | 432.69 |
| Low (AAS ≤10) | 93.8% | 94.0% | 15.573 | 0.067 | 234.00 |
AAS, Adult Appendicitis Score, LR+, positive likelihood ratio, LR, negative likelihood ratio, DOR diagnostic odds ratio