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. Author manuscript; available in PMC: 2012 Jan 1.
Published in final edited form as: J Rheumatol. 2010 Oct 15;38(1):87–98. doi: 10.3899/jrheum.100469

Table 2.

Demographic features of patients with AS and their matched controls in both samples

Feature Discovery Group Confirmation Group
AS,
n = 16		 Control,
n = 14		 AS,
n = 27		 Control,
n = 27
Age, mean (SD) yrs 36.01 (11.94) 32.11 (7.34) 36.08 (11.4) 37.21 (10.68)
No. male (%) 12 (75) 10 (71.43) 14 (51.85) 14 (51.85)
No. Caucasian (%) 13 (81.25) 11 (78.57) 17 (62.96) 17 (62.96)
Disease duration 16.09 (12.87) NA 11.55 (5.86) NA
BASDAI* 5.31 (2.01) NA 5.93 (1.35) NA
C-reactive protein 1.4 (2.23) NA 1.56 (2.17) NA
Uveitis 3 (18.75) 0 14 (51.85) 0
Psoriasis 1 (6.25) 0 3 (11.11) 0
Peripheral inflammatory arthritis 10 (62.5) 0 7 (25.93) 0
Crohn’s disease 0 0 3 (11.11) 0

BASDAI: Bath Ankylosing Spondylitis Disease Activity Index; NA: not applicable.