Table 1.

Demographic and clinical characteristics of patients with ankylosing spondylitis, psoriatic arthritis, and reactive arthritis and subjects without spondyloarthritis.

	No Spondyloarthritis (n = 39,839) mean ± SD or %	Ankylosing Spondylitis (n = 100) mean ± SD or %	Psoriatic Arthritis (n = 551) mean ± SD or %	Reactive Arthritis (n = 13) mean ± SD or %	p
Demographics
Age, yrs	64 ± 14	61 ± 13	65 ± 12	46 ± 7	<0.001
% male	96	98	99	85	0.002
% white	90	95	92	92	0.094
% married	65	66	64	58	0.93
Education					0.143
≤ grade 8	19	13	16	8
Some high school	11	8	13	8
High school graduate	35	32	37	39
College and beyond	36	47	34	46
Employment status					0.05
Employed	32	38	28	62
Unemployed	18	15	18	23
Retired	44	42	49	15
Unknown	7	5	5	0
Clinical characteristics
% with ≥ 1 comorbidity^*	57	64	68	31	<0.001
% current smokers	23	20	24	58	0.029

↵* p value is for comparison between subjects without spondylarthritis to those with ankylosing spondylitis, psoriatic arthritis, or reactive arthritis.