Table 1 Characteristics of the cohort and prevalence of the biomarkers in the different JIA subtypes
Variable | All JIA N = 334 | Systemic N = 31 | RF + polyarticular N = 30 | RF negative polyarticular N = 76 | Persistent oligoarticular N = 119 | Extended oligoarticular N = 26 | Enthesitis related arthritis N = 27 | Undifferentiated arthritis N = 25 |
|---|---|---|---|---|---|---|---|---|
Onset Age* | 6.5 | 6.1 | 11.2 | 6.6 | 5.7 | 3.5 | 9.6 | 7.7 |
Females | 65 | 45 | 97 | 75 | 63 | 81 | 33 | 72 |
CCP IgG | 14 | 13 | 73 | 8 | 4 | 19 | 4 | 20 |
RF IgM | 12 | 3 | 93 | 1 | 2 | 0 | 4 | 24 |
RF IgG | 8 | 0 | 43 | 4 | 6 | 4 | 7 | 0 |
RF IgA | 8 | 6 | 70 | 0 | 1 | 0 | 4 | 8 |
Anti RA33 IgG | 6 | 3 | 3 | 16 | 3 | 12 | 0 | 4 |
ANA IFA | 26 | 3 | 17 | 24 | 41 | 35 | 7 | 16 |