Characteristics of children with JIA and their individually matched (1:4) population controls.
| Characteristics | JIA, n = 1298 | Controls, n = 5179 |
|---|---|---|
| Female sex, n (%) | 822 (63.3) | 3276 (63.3) |
| Age groups, yrs at index date | ||
| 0.7–2.9 | 476 | 1903 |
| 3.0–12.9 | 822 | 3276 |
| Age at index date, yrs | ||
| Mean (SD) | 4.7 (2.8) | 4.7 (2.8) |
| Median (range) | 3.8 (0.8–12.9) | 3.8 (0.8–12.9) |
| Presence of asthma, n (%) | 63 (4.9) | 162 (3.1) |
JIA: juvenile idiopathic arthritis.