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Table 1 HLA-B27-associated spondyloarthritides

From: HLA-B27: natural function and pathogenic role in spondyloarthritis

Disease

HLA-B27 frequency (%) (approximate)

Ankylosing spondylitis

96

Undifferentiated spondyloarthropathy

70

Reactive arthritis

30–70

Colitis-associated spondyloarthritis

33–75

Psoriatic spondyloarthritis

40–50

Juvenile enthesitis-related arthritis

70

Iritis

50

Cardiac conduction defects with aortic incompetence

Up to 88