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Table 6 Disease activity instruments in the ACR guidelines

From: Outcome measures in inflammatory rheumatic diseases

   Thresholds of disease activity
Instrument Range Low Moderate High
Disease Activity Score in 28 joints 0 to 9.4 ≤ 3.2 > 3.2 and ≤ 5.1 > 5.1
Simplified Disease Activity Index 0.1 to 86.0 ≤ 11 > 11 and ≤ 26 > 26
Clinical Disease Activity Index 0 to 76 ≤ 10 > 10 and ≤ 22 > 22
Rheumatoid Arthritis Disease Activity Index 0 to 10 < 2.2 ≥ 2.2 and ≤ 4.9 > 4.9
Patient Activity Scale 0 to 10 < 1.9 ≥ 1.9 and ≤ 5.3 > 5.3
Routine Assessment Patient Index Data 0 to 30 < 6 ≥ 6 and ≤ 12 > 12
  1. Reprinted from [43] with permission of John Wiley & Sons, Inc.