Table 1 Enthesitis-related arthritis (ERA) patients’ and disease characteristics (n = 73)
Characteristics | N (%) |
|---|---|
Demographic characteristics | |
 Male sex | 63 (86) |
 Age at onset, mean ± SD years | 11.0 ± 3.2 |
 Age at follow-up visit, mean ± SD years | 17.6 ± 5.4 |
 Disease duration at follow-up visit, mean ± SD years | 6.5 ± 5.0 |
Disease characteristics | |
 Enthesitis and arthritis | 71 (97) |
 Presence of HLA-B27 antigen | 67 (97a) |
 Clinical or radiographic evidence of sacroiliitis | 12 (16) |
 Onset of arthritis in a male > 6 years old | 68 (93) |
 Acute (symptomatic) anterior uveitis | 7 (10) |
 History of AS/ERA/sacroiliitis with inflammatory bowel disease, Reiter’s syndrome, or acute anterior uveitis in a 1st degree relative | 8 (11) |
 Pauciarticular (≤ 4 joints) onset | 71 (97) |
Genetic marker with HLA-B 27 subtypesb | |
 B*27:04 | 23 (92) |
 B*27:05 | 2 (8) |