Preoperative correlations of VAS and ODI scores.
| Measure | VAS Preoperative | ODI Preoperative |
| VAS preoperative | ||
| Pearson correlation | 1 | 0.811a |
| P value (2-tailed) | <0.001 | |
| N | 23 | 23 |
| ODI preoperative | ||
| Pearson correlation | 0.811a | 1 |
| P value (2-tailed) | <0.001 | |
| N | 23 | 23 |
Abbreviations: ODI, Oswestry Disability Index; VAS, visual analog scale.
↵a Correlation is significant at the 0.01 level (2-tailed).