% Anti-CarP positivity
| ACPA+ arthralgia | IA symptoms | New RA | Established RA | |
|---|---|---|---|---|
| ACPA− | n/a | 6.0% (10/167) | 16.4% (9/55) | 13.3% (4/30) |
| ACPA+ | 40.6% (50/123) | 28.0% (7/25) | 53.3% (81/152) | 33.0% (31/94) |
| Total | 40.6% (50/123) | 8.8% (17/193) | 43.5% (90/207) | 28.2% (35/124) |