Table 1.
Diagnostic test and p-value according to different filters
| Filters | Sensitivity | Specificity | PPV | NPV | Accuracy | p1 | p2 |
|---|---|---|---|---|---|---|---|
| No filter | 56.8% (9) | 58.3% (9) | 62.5% (9) | 52.5% (9) | 57.5% (9) | 0.60 | – |
| Sharpen Mild | 72.2% (5) | 68.2% (7) | 65.0% (8) | 75.0% (5) | 70.0% (6) | 0.54 | 0.13 |
| Sharpen Super Mild | 68.3% (7) | 69.2% (6) | 70.0% (4) | 67.5% (6) | 68.8% (7) | 1.0 | 0.7 |
| S9 | 78.8% (2) | 70.2% (4) | 65.0% (7) | 82.5% (1) | 73.8% (3) | 0.19 | 0.07 |
| Sharpen | 76.3% (3) | 73.8% (3) | 72.5% (3) | 77.5% (3) | 75.0% (2) | 0.82 | 0.32 |
| Sharpen 3 × 3 | 73.0% (4) | 69.8% (5) | 67,5% (5) | 75.0% (4) | 71.3% (5) | 0.67 | 0.29 |
| Angio Sharpen Medium 5 × 5 | 69.6% (6) | 76.5% (1) | 80.0% (1) | 65.0% (7) | 72.5% (4) | 0.28 | 0.85 |
| Angio Sharpen High 5 × 5 | 78.9% (1) | 76.2% (2) | 75.0% (2) | 80.0% (2) | 77.5% (1) | 0.81 | 0.32 |
| Shadow 3 × 3 | 65.9% (8) | 66.7% (8) | 67.5% (6) | 65.0% (8) | 66.3% (8) | 1.0 | 0.68 |
NPV, negative predictive values; p1, values of all images vs gold standard; p2, values of images with filters vs images with no filters; PPV, positive predictive value.
Values in parentheses relate to filters: from 1 (highest percentage value) to 9 (lowest percentage value).