Table 1

HLA-B27-associated spondyloarthritides

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

McMichael and Bowness Arthritis Res 2002 4(Suppl 3):S153   doi:10.1186/ar571