Construct validity of fatigue measures. Values are Pearson correlation coefficients.
| Fatigue Measures | TJC28 | ESR | VAS Well-being | VAS Pain | VAS Disease Activity |
|---|---|---|---|---|---|
| NRS severity | 0.22 | 0.10 | 0.48 | 0.40 | 0.41 |
| NRS effect | 0.21 | 0.10 | 0.49 | 0.41 | 0.42 |
| NRS coping | 0.13 | 0.01* | 0.39 | 0.24 | 0.18 |
| Physical | 0.23 | 0.10 | 0.47 | 0.39 | 0.41 |
| Living | 0.25 | 0.15 | 0.38 | 0.43 | 0.51 |
| Cognition | 0.22 | 0.11 | 0.31 | 0.34 | 0.37 |
| Emotion | 0.23 | 0.12 | 0.34 | 0.29 | 0.36 |
| SF-36 vitality | 0.19 | 0.12 | 0.47 | 0.39 | 0.38 |
↵* Not significant at the 0.05 level (2-sided). TJC28: tender joint count at 28 joints; ESR: erythrocyte sedimentation rate; VAS: visual analog scale; NRS: numerical rating scales; SF-36: Medical Outcomes Study Short Form-36.