Table 2

Demographic and diagnostic characteristics of study participants.

Patient CharacteristicsIA, n = 30Non-IA, n = 113
Age, yrs mean (SD)49 (15)63 (17)
Sex, % male30.019.6
Diagnosis, %
 Early inflammatory arthritis33.3
 Rheumatoid arthritis30.0
 Psoriatic arthritis16.7
 Ankylosing spondylitis13.3
 Reactive arthritis3.3
 Undifferentiated spondyloarthropathy3.3
 Osteoarthritis40.7
 Arthralgia8.0
 Fibromyalgia5.3
 Systemic lupus erythematosus4.4
 Back pain3.5
 Other miscellaneous diagnoses38.1