Table 2 Demographic data of JIA and non-JIA children in this cohort study
JIA (n = 2,892) | Non-JIA (n = 11,568) | ||
|---|---|---|---|
Gender | Boys | 1,618 | 6,472 |
Girls | 1,274 | 5,096 | |
Female : male ratio | 0.79 : 1 | 0.79 : 1 | |
Age Group | 0 - 5 | 233 | 932 |
6 - 10 | 699 | 2,796 | |
11 - 15 | 1,960 | 7,840 | |
Type of JIA by ILAR criteria | |||
Polyarthritis | 377 | NA | |
Pauciarthritis or oligoarthritis (persistent and extended) | 136 | NA | |
Enthesitis-related arthritis | 1221 | NA | |
Psoriatic arthritis | 62 | NA | |
Systemic | 6 | NA | |
Unclassifiable | 1096 | NA | |
Years of follow-up | Mean (SD) | 6.40 (1.44) | 7.78 (0.59) |
Person-years at risk | 18,530.97 | 89,156.74 |