Table E1.
Examination of multicollinearity using variance inflation factors and correlations.
| VIF | Correlations | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | ||
| Age (1) | 1.162 | 1.000 | ||||||||
| Pain duration (2) | 1.073 | 0.228 | 1.000 | |||||||
| BPI Pain Severity (3) | 1.566 | −0.086 | 0.097 | 1.000 | ||||||
| BPI Pain Interference (4) | 2.205 | −0.166 | 0.053 | 0.596 | 1.000 | |||||
| PSEQ Pain Self-efficacy (5) | 1.643 | 0.146 | −0.021 | −0.364 | −0.568 | 1.000 | ||||
| PCS Score (6) | 1.697 | −0.160 | 0.023 | 0.293 | 0.433 | −0.413 | 1.000 | |||
| PHQ9 Depression Severity (7) | 2.974 | −0.277 | −0.011 | 0.313 | 0.523 | −0.499 | 0.585 | 1.000 | ||
| GAD7 Anxiety Severity (8) | 2.483 | −0.261 | −0.019 | 0.253 | 0.418 | −0.376 | 0.564 | 0.757 | 1.000 | |
| Time (9) | 1.032 | −0.016 | −0.007 | −0.070 | −0.058 | 0.111 | −0.006 | −0.116 | −0.080 | 1.000 |
Note: VIF=variance inflation factor.