Demographic and diagnostic characteristics of study participants.
| Patient Characteristics | IA, n = 30 | Non-IA, n = 113 |
|---|---|---|
| Age, yrs mean (SD) | 49 (15) | 63 (17) |
| Sex, % male | 30.0 | 19.6 |
| Diagnosis, % | ||
| Early inflammatory arthritis | 33.3 | — |
| Rheumatoid arthritis | 30.0 | — |
| Psoriatic arthritis | 16.7 | — |
| Ankylosing spondylitis | 13.3 | — |
| Reactive arthritis | 3.3 | — |
| Undifferentiated spondyloarthropathy | 3.3 | — |
| Osteoarthritis | — | 40.7 |
| Arthralgia | — | 8.0 |
| Fibromyalgia | — | 5.3 |
| Systemic lupus erythematosus | — | 4.4 |
| Back pain | — | 3.5 |
| Other miscellaneous diagnoses | — | 38.1 |