| CT scan | Bleb | EC | Total |
| Bleb | 9 | 5 | 14 |
| No Bleb | 7 | 10 | 17 |
| Normal | 2 | 3 | 5 |
| Total | 18 | 18 | 36 |
| Sensitivity | Specificity | Prevalence | PPV |
| 50% | 56% | 44% | 64% |
| NPV | 59% |
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