Table II.
Age at onset and gender of patients with different categories of juvenile idiopathic arthritis (JIA) with respect to the occurrence of HLA-B27 antigen (N = 383). Age is presented as median value with interquartile range in parentheses.
| JIA categories | Age at onset [years] | Gender | |||
|---|---|---|---|---|---|
| All | B27(+) | B27(–) | HLA-B27(+) girls | HLA-B27(+) boys | |
| Systemic arthritis (N = 14) |
10.5 (4-13) |
- | 10.5 (4-13) |
0/6 (0%) |
0/8 (0%) |
| Oligoarthritis (N = 202) |
10 (5-13) |
10 (8-12) |
9 (4.5-13) |
19/114 (16.7%) |
12/88 (13.6%) |
| Persistent course (N = 195) |
10 (5-13) |
10 (8-13) |
9 (4.5-13) |
17/110 (17.7%) |
11/85 (12.9%) |
| Extended course (N = 7) |
9 (4-11) |
9 (4-11) |
6.5 (3.5-10) |
2/4 (50%) |
1/3 (33.3%) |
| Polyarthritis, RF(+) (N = 7) |
8 (7.5-15) |
11 (11-11) |
7.5 (7.5-15) |
1/5 (20%) |
0/2 (0%) |
| Polyarthritis, RF(-) (N = 75) | 8.5 (5-14) |
9 (5-14) |
8 (4-14) |
6/52 (11.5%) |
5/23 (21.7%) |
| Enthesitis-related arthritis (N =62) | 12 (10-15) |
12.5 (10.5-15) |
10.5 (4-13) |
13/18 (72.2%) | 31/44 (70.4%) |
| Psoriatic arthritis (N = 8) |
13 (11-16) |
11 (8-15) |
14.5 (13-16) |
1/4 (25%) |
1/4 (25%) |
| Unclassified (N = 15) |
11 (7-13) |
11 (7-13) |
13 (13-13) |
6/7 (85.7%) |
7/8 (87.5%) |