Table 3.
Reliability between assessors A and B
| MRI feature | Prevalencea | Kappa or ICC (95% CI) | Observed agreement |
|---|---|---|---|
| DDW (0–5) | N/A | 0.81 (0.70–0.88) (ICC) | 65% exact 100% within 1 grade |
| DD ≥ 3 | 80% | 0.69 (0.46–0.92) | 90% |
| DD ≥ 4 | 46% | 0.77 (0.60–0.93) | 88% |
| HIZ | 30% | 0.46 (0.22–0.69) | 77% |
| Modic type 1 | 10% | 0.46 (0.11–0.80) | 90% |
| Modic any | 22% | 0.80 (0.62–0.99) | 93% |
| Annular tear | 48% | 0.02 (−0.16–0.20) | 43% |
| Herniation | 57% | 0.59 (0.39–0.80) | 80% |
DDW, disc degeneration score (0–5 scale) at the worst lumbar level; DD ≥ 3, participants with a disc degeneration score ≥3 at any level (%); DD ≥ 4, participants with a disc degeneration score ≥4 at any level (%), HIZ, participants with a high-intensity zone at any level (%)
aPrevalence is based on average of the two raters, ICC was used for DDW