Table 2.
Details of the intraobserver and interobserver reliability of Pfirrmann grading, disk bulging, the high-intensity zone, and spondylolisthesis on magnetic resonance imaging reading
| MRI findings | MRI (n) | Kappa | 95% CI |
|---|---|---|---|
| Pfirrmann grading | |||
| Intraobserver reliability | 20 vs 20 | 0.66 | 0.55–0.77 |
| Interobserver reliability | 20 vs 20 | 0.64 | 0.52–0.76 |
| Disk bulging | |||
| Intraobserver reliability | 20 vs 20 | 0.60 | 0.39–0.81 |
| Interobserver reliability | 20 vs 20 | 0.67 | 0.48–0.87 |
| High-intensity zone | |||
| Intraobserver reliability | 20 vs 20 | 0.85 | 0.64–1.06 |
| Interobserver reliability | 20 vs 20 | 0.93 | 0.79–1.07 |
| Spondylolisthesis | |||
| Intraobserver reliability | 20 vs 20 | NA | NA |
| Interobserver reliability | 20 vs 20 | NA | NA |
Abbreviations: CI, confidence interval; MRI, magnetic resonance imaging; NA, not applicable.