Comparison of diagnostic performance among subjective disk angle measurements and IDA measurements
| Subjective Disk Widening | IDA of 13 | IDA > 2 SD from Other Levels | IDA > 1 SD from Normal Values | |
|---|---|---|---|---|
| Sensitivity (%) | 16.4 | 82.0 | 72.1 | 86.1 |
| Specificity (%) | 99.4 | 89.1 | 100 | 84.7 |
| PPV (%) | 87.0 | 45.7 | 100 | 38.6 |
| NPV (%) | 82.3 | 97.8 | 97.0 | 98.2 |
| AUC | 0.580 | 0.854 | 0.860 | 0.853 |
| Interpretation | Poor discrimination | Excellent discrimination | Excellent discrimination | Excellent discrimination |
Note:— NPV indicates negative predictive value; PPV, positive predictive value; SD, standard deviation.