Table 1.

Clinical characteristics of patients with ankylosing spondylitis (AS). Data are n (%) except where indicated.

CharacteristicsPatients with AS, n = 1150
Back pain1054 (91.7)
Morning stiffness > 30 min594 (51.7)
Back pain at night772 (67.1)
Peripheral joint involvement922 (80.2)
Duration, yrs0.8–18
Uveitis285 (24.8)