Table 3.
Disease activity formulas and categories
| Index | Formula | Remission | Disease activity |
||
|---|---|---|---|---|---|
| Low | Moderate | ffigh | |||
| SDAI | TJC + SJC + PGA (cm) + DGA (cm) + CRP (mg/dL) | ≤ 3.3 | ≤ 11 | ≤ 26 | > 26 |
| CDAI | TJC + SJC + PGA (cm) + DGA (cm) | ≤ 2.8 | ≤ 10 | ≤ 22 | > 22 |
| DAS-28 | 0.56 x VTJC + 0.28 x VSJC + 0.7 x In(ESR) + 0.014 x PGA (mm) | ≤ 2.6 | ≤ 3.2 | ≤ 5.1 | > 5.1 |
SDAI, simplified disease activity index; TJC, tender joint count; SJC, swollen joint counts; PGA, patient global assessment; CRP, C-reactive protein; CDAI, clinical disease activity index; DAS-28, 28-joint disease activity score; ESR, erythrocyte sedimentation rate.