Table 3. Cutoff values for the 1D, 2D, and 3D radiological parameters.
| Parameters | Cutoff | Sensitivity (%) | Specificity (%) | Diagnostic coincidence rate (%) |
|---|---|---|---|---|
| APD (mm) | 6.0 | 72.8 | 64.6 | 69.4 |
| CGP (%) | 45.6 | 74.1 | 67.1 | 70.0 |
| OLFA (mm2) | 57.7 | 79.0 | 76.0 | 77.5 |
| OLFA ratio (%) | 32.4 | 80.3 | 77.2 | 78.8 |
| OLFV (mm3) | 599.0 | 86.4 | 87.3 | 86.7 |
| OLFV ratio (%) | 26.3 | 87.7 | 88.6 | 88.1 |
1D, one-dimensional; 2D, two-dimensional; 3D, three-dimensional; APD, anteroposterior canal diameter; CGP, canal grade (paramedian); OLF, ossification of the ligamentum flavum; OLFA, OLF area; OLFV, OLF volume.