Table 6

Disease activity instruments in the ACR guidelines

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

Reprinted from [43] with permission of John Wiley & Sons, Inc.

Fransen and van Riel Arthritis Research & Therapy 2009 11:244   doi:10.1186/ar2745