From: The likelihood of persistent arthritis increases with the level of anti-citrullinated peptide antibody and immunoglobulin M rheumatoid factor: a longitudinal study of 376 patients with very early undifferentiated arthritis
Persistent arthritis
Self-limiting disease
Total
Anti-CCP positive only
15
6
21
Anti-CCP and IgM RF positive
37
4
41
IgM RF positive only
12
18
No antibody positivity
110
186
296
174
202
376