Table 1 Criteria sets investigated for the classification of rheumatoid arthritis
1987 ACR criteria1987 ACR criteria+anti-CCPCCP 7 criteriaCCP 6 criteria
1. Morning stiffness >1 h*
2. Arthritis ⩾3 joints*
3. Hand arthritis*
4. Symmetric arthritis*
5. Rheumatoid nodules
6. RF+
7. Radiographic changes
8. Anti-CCP+
No. criteria required⩾4 of 7⩾4 of 8⩾3 of 7⩾3 of 6
  • ACR, American College of Rheumatology; anti-CCP, antibodies to cyclic citrullinated peptide; CCP 7 (criteria), removing rheumatoid nodules alone while substituting anti-CCP; CCP 6 (criteria), removing both rheumatoid nodules and erosions while substituting anti-CCP; RF, rheumatoid factor.

  • *Arthritis symptoms ⩾6 weeks.