Baseline characteristics
Characteristic | No. (total n=244) |
---|---|
Age in years, mean ± SD | 47 ± 11 |
Female sex | 181 (74%) |
Arthralgia duration in months, median (IQR) | 12 (8–36) |
Number of reported painful joints, median (IQR) | 2 (0–4) |
Tender joint count (53 joints), median (IQR) | 0 (0–1) |
Antibody status | |
IgM-RF positive, aCCP negative | 81 (33%) |
aCCP positive, IgM-RF negative | 89 (37%) |
aCCP and IgM-RF positive | 74 (30%) |
Antibody levels | |
IgM-RF (IU/ml), median (IQR)* | 76 (42–123) |
aCCP (AU/ml), median (IQR)* | 39 (12–145) |
Shared epitope status | |
Positive | 128 (52%) |
↵* Patients who were positive only.
aCCP, anti-cyclic citrullinated peptide antibody; AU/ml, arbitrary units/ml; IgM-RF, IgM rheumatoid factor.