Demographic characteristics of the study groups
| Study group | n | Female/male | Age at investigation (years) | Duration of disease (years) |
|---|---|---|---|---|
| Values are n or mean (SD), range. | ||||
| JIA, juvenile idiopathic arthritis. | ||||
| JIA | 39 | 18/21 | 10.03 (3.26), 4 to 16 | 3.36 (2.02), 1 to 8 |
| Healthy controls | 41 | 21/20 | 8.8 (2.63), 5 to 14 | – |