Assessment of accuracy of imaging diagnosis
| OLF with DO | OLF without DO | Total | |
|---|---|---|---|
| Segments with T/C/B | 49 | 11 | 60 |
| Segments without T/C/B | 3 | 179 | 182 |
| Total | 52 | 190 | 242 |
Sensitivity=94.23% (49/52), specificity=94.21% (179/190).
Positive predictive values=81.67% (49/60), negative predictive values=98.35% (179/182).
Test accuracy=94.21% (49+179/242).
B, bridge sign; C, comma sign; DO, dural ossification; OLF, ossification of ligamentum flavum; T, tram track sign.