Demographic and disease manifestations of confirmed cases of JIA, Kaiser Permanente, Northern California, 1996–2009.
| Characteristics | Proportion of Confirmed JIA Cases, n = 67 % |
|---|---|
| Age, yrs* | |
| 0–5 | 33 |
| 6–10 | 21 |
| 11–15 | 46 |
| Sex | |
| Female | 64 |
| Race/ethnicity | |
| White | 40 |
| African American | 3 |
| Asian | 6 |
| Hispanic | 26 |
| Other/multiracial/unknown | 25 |
| Type | |
| Oligoarticular | 48 |
| Polyarticular | 31 |
| Systemic | 9 |
| Psoriatic arthritis | 8 |
| Ankylosing spondylitis | 3 |
| Unknown | 1 |
| Laboratory findings (no. who received test) | |
| Antinuclear antibody (n = 65) | 70% positive |
| Rheumatoid factor (n = 55) | 9% positive |
| HLA-B27 (n = 16) | 2% positive |
| Joint involvement | |
| Knee | 72 |
| Hand | 43 |
| Feet | 37 |
| Hip | 9 |
| Shoulder | 7 |
| Cervical spine/neck | 3 |
| Spine | 3 |
| Other | 7 |
| Not recorded | 7 |
| Associated autoimmune disease | |
| Negtive/not mentioned | 82 |
| Other** | 13 |
| Presence during course of the disease | |
| Uveitis/iritis | 3 |