Unadjusted correlation coefficients comparing EQ-5D-5L and BPI responses
| Correlation | Correlation coefficient | 95% CI | P value |
| EQ-5D-5L vs BPI pain severity score | |||
| Intervention cohort baseline | 0.73 | 0.65 to 0.79 | <0.01 |
| Intervention cohort 3 months | 0.75 | 0.66 to 0.82 | <0.01 |
| Intervention cohort 12 months | 0.73 | 0.63 to 0.80 | <0.01 |
| Usual care cohort 12 months | 0.8 | 0.72 to 0.86 | <0.01 |
| EQ-5D-5l vs BPI pain interference score | |||
| Intervention cohort baseline | 0.72 | 0.63 to 0.78 | <0.01 |
| Intervention cohort 3 months | 0.71 | 0.62 to 0.79 | <0.01 |
| Intervention cohort 12 months | 0.73 | 0.63 to 0.80 | <0.01 |
| Usual care cohort 12 months | 0.83 | 0.76 to 0.88 | <0.01 |
BPI, Brief Pain Inventory; EQ-5D-5L, EuroQol 5 Dimension 5 Level.