Distribution of demographics and disease activity measures in 2417 RA patient visits.
| Characteristic | No. of Observations Available | Mean ± SD or no. (%) | Correlation Coefficient with ESR* | Correlation Coefficient with CRP* |
|---|---|---|---|---|
| Age, yrs | 2417 | 50.7 ± 12.3 | 0.06 | 0.01 (NS) |
| Female | 2417 | 1971 (81.5%) | −0.13 | −0.02 (NS) |
| ESR, mm/h | 2390 | 35.0 ± 26.3 | 1.0 | 0.59 |
| CRP, mg/dl | 2397 | 1.75 ± 2.68 | 0.59 | 1.0 |
| Swollen joint count | 2410 | 11.7 ± 10.2 | 0.25 | 0.28 |
| Tender joint count | 2410 | 21.8 + 17.1 | 0.21 | 0.18 |
| Patient VAS | 2403 | 49.7 ± 27.3 | 0.30 | 0.35 |
| Physician VAS | 2403 | 45.2 ± 25.5 | 0.33 | 0.41 |
| DAS-ESR | 2369 | 6.18 ± 1.98 | 0.53 | 0.44 |
| DAS-CRP | 2383 | 5.71 ± 1.84 | 0.39 | 0.48 |
| CDAI | 2394 | 43.0 ± 27.8 | 0.28 | 0.29 |
| SDAI | 2377 | 44.8 ± 28.6 | 0.33 | 0.36 |
↵* Pearson correlation coefficients for correlations with ESR and log (CRP). All p values < 0.001 unless specified. ESR: erythrocyte sedimentation rate; CRP: C-reactive protein; VAS: visual analog scale; DAS (DAS28): Disease Activity Scale (components: 28 joints assessed for swelling and tenderness, ESR or CRP, patient global health assessment on a VAS; arithmetic transformation required); CDAI: Clinical Disease Activity Index (components: 28 joints assessed for swelling and tenderness, patient global disease activity assessment on a VAS, evaluator global disease activity assessment on a VAS); SDAI: Simplified Disease Activity Index (components: 28 joints assessed for swelling and tenderness, patient global disease activity assessment on a VAS, evaluator global disease activity assessment on a VAS, CRP in mg/dl (0.1–10.0). NS: nonsignificant.