Later-onset rheumatoid factor negative polyarticular juvenile idiopathic arthritis (JIA): a unique patient group?
The two-year outcome of patients with late-onset RF- polyarticular JIA was very good with the majority of patients having minimally active disease at last follow-up. Presence of significant polyarthritis at presentation was the only feature associated with long-term joint activity. Sex and lab results did not show any correlation with active joint in this cohort of RF-JIA patients.
Low intelligence is associated with a higher predisposition for FSS in adolescents, especially in those adolescents perceiving high parental expectations.