Table 3.
Overall performance values for Alvarado score, ultrasound, CT, and diagnostic algorithm
| Measurement | Alvarado-score > 7 (n = 183) | Ultrasonography (n = 181) | CT scan (n = 36) | Diagnostic algorithm (n = 183) | ||||
|---|---|---|---|---|---|---|---|---|
| % | 95% CI | % | 95% CI | % | 95% CI | % | 95% CI | |
| Sensitivity | 73.9 | 61–84 | 58.2 | 35–62 | 100 | 81–100 | 100 | 95–100 |
| Specificity | 88.1 | 81–93 | 97.3 | 92–99 | 100 | 82–100 | 96.6 | 92–99 |
| PPV | 77.4 | 65–87 | 90.0 | 73–98 | 100 | 81–100 | 94.2 | 86–98 |
| NPV | 85.9 | 78–92 | 78.9 | 71–85 | 100 | 82–100 | 100 | 97–100 |
| Accuracy | 82.3 | 76–87 | 80.9 | 74–87 | 100 | 92–100 | 97.8 | 95–99 |
PPV positive predictive value, NPV negative predictive value