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 |
* All values are percentages, except onset age given in years.