Table 1.
Demographic and clinical characteristics of the study participants
| All patients | n = 648 |
|---|---|
| Age, mean (SD) | 40.6 (11.4) |
| ≤65 years, n (%) | 639 (98.6) |
| >65 years, n (%) | 9 (1.4) |
| Sex (female), n (%) | 231 (35.7) |
| Pre-index comorbid conditions, n (%) | |
| Uveitis | 49 (7.6) |
| Heart disease | 33 (5.1) |
| Diabetes | 31 (4.8) |
| Allergy | 26 (4.1) |
| Respiratory disease | 22 (3.4) |
| Crohn’s disease | 21 (3.2) |
| Rheumatoid arthritis | 13 (2.1) |
| Disease duration, years, mean (SD) | 7.7 (7.4) |
| Symptom duration, years, mean (SD) | 5.7 (6.3) |
SD standard deviation, DMARDs disease-modifying antirheumatic drugs