Table I.

Recommended indices for assessment of arthritis activity

Index	Components	Results
DAS28 (ESR or CRP)	4: Number of painful joints (0–28) Number of swollen joints (0–28) Patient-reported VAS disease activity (0–10) ESR (0–100) or CRP	Range of possible values 0–9.4 Disease activity assessment: < 2.6 points – remission ≥ 2.7 and ≤ 3.2 – low activity > 3.2 and ≤ 5.1 – moderate activity > 5.1 – high activity
DAS original	4: Number of painful joints (Ritchie’s index: 0–78), Number of swollen joints (0–44), Patient-reported VAS disease activity (0–10), ESR (0–150)	Range of possible values 0–10 Disease activity assessment: < 1.6 points – remission ≥ 1.6 and ≤ 2.4 – low activity > 2.4 and ≤ 3.7 – moderate activity > 3.7 – high activity
CDAI	4: Number of painful joints (0–28) Number of swollen joints (0–28) Patient-reported VAS disease activity (0–10) Researcher-reported VAS disease activity (0–10)	Range of possible values 0–76 Disease activity assessment: < 2.8 points – remission ≥ 2.8 and ≤ 10 – low activity > 10.1 and ≤ 22 – moderate activity > 22.1 – high activity
SDAI	5: Number of painful joints (0–28) Number of swollen joints (0–28) Patient-reported VAS disease activity (0–10) Researcher-reported VAS disease activity (0–10) CRP (0–10)	Range of possible values 0–86 Disease activity assessment: < 3.3 points – remission ≥ 3.4 and ≤ 11 – low activity > 11.1 and ≤ 26 – moderate activity > 26.1 – high activity

CDAI – Clinical Disease Activity Index, CRP – C-reactive protein, DAS – disease activity score, ESR – erythrocyte sedimentation rate, SDAI – Simplified Disease Activity Index, VAS – Visual Analogue Scale.