Table 1. Clinical features of the investigated AS patients and controls.

Clinical features	AS patients		Healthy controls
	Total (n = 291)	%	Total (n = 312)	%
Age at onset(years±S.D)	34.6±8.2		37.9±8.4
Male	165	56.7	169	54.2
Female	126	43.3	143	45.8
HLA-B27	216	69.2	58	16.0
Uveitis	163	56.3	0
Arthritis	291	100	0