Differences between improvement criteria
| ACR | EULAR | |
|---|---|---|
| 1 Developed to distinguish between: | Active and placebo treatment | High and low disease activity |
| 2 Instrument components: | All seven core set variables | Disease Activity Score (index based on 3–4 core set variables) |
| 3 Improvement defined using: | Relative change | Significant change and reached level |
| 4 Classification of improvement: | two categories | three categories |