Predictors of Disease Activity in Patients With Juvenile Idiopathic Arthritis at 12 and 24 Months After Diagnosis.

Patients with JIA with active disease at 12 and 24 months were older at diagnosis, categorized as polyarticular RF-negative, psoriatic, or enthesitis-related JIA. Active disease at 3 months after diagnosis was associated with worse outcomes at 12 and 24 months.