Table 1.
Demographic and clinical characteristics of the study sample
| Mean (SD) or count (%) | |
| Age (years) | 15.0 (1.8) |
| Age at diagnosis (years) | 7.3 (5.2) |
| Female sex | 24 (77.4) |
| BMI (kg/m2) | 23.0 (6.3) |
| JIA type | |
| Oligoarticular | 5 (16.1) |
| Polyarticular RF negative | 13 (41.9) |
| Polyarticular RF positive | 3 (9.7) |
| Enthesitis-related arthritis | 4 (12.9) |
| Psoriatic arthritis | 0 (0.0) |
| Systemic arthritis | 1 (3.2) |
| Other | 5 (16.1) |
| Medications for JIA | |
| Biologic | 16 (51.6) |
| Methotrexate | 8 (25.8) |
| NSAID | 8 (25.8) |
| Leflunomide | 6 (19.4) |
| Sulfasalazine | 1 (3.2) |
| Prednisone | 0 (0.0) |
| None | 7 (22.6) |
| Taking melatonin | 2 (6.5) |
BMI, body mass index; JIA, juvenile idiopathic arthritis; NSAID, non-steroidal antiinflammatory drugs; RF, rheumatoid factor.