Table 1.
Demographics of the study population
| Patients with JSpA | Patients without JSpA | |||
|---|---|---|---|---|
| (N = 47) | (N = 62) | |||
| N (%) | N (%) | |||
| MRI + | MRI – | MRI + | MRI – | |
| (N = 23) | (N = 24) | (N = 7) | (N = 55) | |
| N (%) | N (%) | N(%) | N (%) | |
| Age (years) | 10.8–18 (mean 15.0) | 7.7–17.1 (mean 12.6) | 12.7–18,8 (mean 15.1) | 6.8–18 (mean13.1) |
| Male | 13 (57%) | 12 (50%) | 1 (14%) | 15 (27%) |
| HLA-B27 + | 13 (27%) (0 ND) | 8 (33%) (2 ND) | 2 (29%) (1 ND) | 8 (15%) (25 ND) |
| Inflammatory back pain | 20 (87%) | 18 (75%) | 7 (100%) | 50 (91%) |
| Sacroiliac joint tenderness | 13(57%) | 13 (54%) | 3 (43%) | 16 (29%) |
| IBP AND sacroiliac joint tenderness | 10 (43%) | 7 (29%) | 3 (43%) | 11 (20%) |
| Arthritis (peripheral) | 13 (57%) | 16 (67%) | 0 (0%) | 13 (24%) |
| Enthesitis (peripheral) | 14 (61%) | 15 (63%) | 1 (14%) | 5 (9%) |
(N Number of patients, JSpA Juvenile Spondylarthropathy, MRI+ sacroiliitis on MRI according to global assessment), MRI - normal MRI, HLA-B27 Human Leukocyte Antigen B27, ND Not determined)