Bivariate Spearman correlation of time-averaged values of Health Assessment Questionnaire (HAQT) with baseline variables of disease activity and measures of comorbidity
| Variables at baseline | Spearman r* (95% CI) |
|---|---|
| Disease duration | 0.30 (0.21 to 0.39) |
| Age | 0.26 (0.16 to 0.35) |
| Body mass index | 0.1 (−0.01 to 0.21) |
| Swollen joint count 28 | 0.13 (0.02 to 0.22) |
| Tender joint count 28 | 0.40 (0.31 to 0.48) |
| Visual analogue scale for pain | 0.57 (0.49 to 0.63) |
| Patient global assessment of disease activity | 0.56 (0.49 to 0.63) |
| Evaluator global assessment of disease activity | 0.30 (0.21 to 0.39) |
| Clinical disease activity index | 0.48 (0.40 to 0.55) |
| Simplified disease activity index | 0.46 (0.20 to 0.39) |
| C-reactive protein | 0.20 (0.10 to 0.30) |
| Erythrocyte sedimentation rate | 0.28 (0.18 to 0.37) |
| Charlson comorbidity index | 0.24 (0.14 to 0.33) |
| Charlson comorbidity index adjusted for age | 0.30 (0.20 to 0.38) |
| Number of comorbid conditions | 0.24 (0.14 to 0.34) |
↵* p Values<0.001, except for swollen joint count 28 (p=0.02) and body mass index (p=0.07).