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Correlation coefficients of each spinal level between MRI grades and neurological manifestations
| Observer | L3–4 (p-value) | L4–5 (p-value) | L5–S1 (p-value) |
| Reader 1 | 0.678 (<0.001) | 0.547 (<0.001) | 0.438 (<0.001) |
| Reader 2 | 0.612 (<0.001) | 0.467 (<0.001) | 0.329 (<0.001) |
