The difference between JRA and RA is permanence
The main difference between JRA and adult RA is that some children with JRA tend to outgrow their disease, while adults with adult RA generally experience permanent symptoms. In fact, findings from several studies report that symptoms of JRA disappear in over 50% of all affected children. What’s more, unlike adult RA, JRA may affect a child’s bone development and growth.
Another main difference between JRA and adult RA is the number of individuals who test positive for rheumatoid factor. Well up to 80% of adults with RA have rheumatoid factor, while less than 50% of children with JRA test positive for rheumatoid factor. Without a clear indication of the rheumatoid factor, the percentage of children with JRA who will outgrow their disease remains unknown.