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| Group 1 | Group 2 | |||
| Spearman rank correlation | P | Spearman rank correlation | P | |
| Disc degeneration grade | 0.266 | 0.000 | 0.220 | 0.000 |
| Spine level | 0.206 | 0.000 | 0.087 | 0.000 |
| Age range (yrs) | 0.116 | 0.000 | 0.217 | 0.000 |
*Analyzed by Spearman rank correlation.
