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Table 1 Demographics of the study population

From: ASAS definition for sacroiliitis on MRI in SpA: applicable to children?

  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%)
  1. (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)