Screening data for each degree of compression. Note low sensitivities for the compressed images rising to 0.72 for the 0% compressed image
| Percentage compression | ||||
|---|---|---|---|---|
| 90% | 80% | 70% | 0% | |
| Sensitivity | 0.38 | 0.50 | 0.65 | 0.72 |
| Specificity | 1.00 | 1.00 | 0.83 | 0.84 |
| PPV | 1.00 | 1.00 | 0.87 | 0.88 |
| NPV | 0.46 | 0.52 | 0.58 | 0.67 |
| Weighted kappa | 0.60 | 0.75 | 0.77 | 0.84 |
PPV = positive predictive value; NPV = negative predictive value.