Table 1

Clinical characteristics of patients with ankylosing spondylitis and controls

Group n Mean (SD) age (years) Male/female ratio Disease duration (years) (SD)
Ankylosing spondylitis (all HLA-B27+)2538.7 (12.1)16/910.6 (4.7)
Healthy HLA-B27 positive controls1839.6 (11.4)11/7
Healthy HLA-B27 negative controls2241.2 (13.2)12/10