Table 2.

Clinical characteristics of the investigated subjects.

Clinical features	Total	Percentage
AAU patients	929	100
Mean age ± SD (years)	39.8 ± 12.3
AAU with AS	443	47.7
AAU without AS	486	52.3
AAU male	569	61.2
AAU female	360	38.8
AAU with AS (male)	326 (443 tested)	73.6
AAU with AS (female)	117 (443 tested)	26.4
AAU without AS (male)	243 (486 tested)	50
AAU without AS (female)	243 (486 tested)	50
HLA-B27+ AAU	546 (792 tested)	68.9
HLA-B27+AAU AS+	348 (428 tested)	81.3
HLA-B27+AAU AS−	198 (364 tested)	54.4
Control	714	100
Mean age ± SD (years)	39.5 ± 10.8
Male	428	59.9
Female	286	40.1