Table 1

RA disease activity indices: calculation and values for disease activity states*

RA activity state
DAS280.56*√(TJC28)+0.28*√(SJC28)+0.70*ln(ESR)+0.014*GH<2.62.6 to ≤3.2>3.2 to ≤5.1>5.1
CDAITJC28+SJC28+MDGL+PTGL<2.82.8 to ≤10> 10 to ≤22>22
RAPID3HAQ+Pain+PTGL<33 to ≤6> 6 to ≤12>12
  • * PTGL or GH rating was scored on 0–10 scale for CDAI and RAPID3, and 0–100 scale for DAS28.

  • HAQ scored on a 0–10 scale for purpose of computing RAPID3 score.

  • CDAI, Clinical Disease Activity Index; DAS28, Disease Activity Score based on 28 joint evaluation; ESR, erythrocyte sedimentation rate; GH, patient's assessment of general health; HAQ, health assessment questionnaire; MDGL, physician's global assessment of disease activity; PTGL, patient's global assessment of disease activity; RA, rheumatoid arthritis; RAPID3, Routine Assessment of Patient Index Data 3; SJC28, swollen joint count on 28 joint evaluation; TJC28, tender joint count on 28 joint evaluation.