Table 1

 The three main sets of criteria for childhood chronic arthritis

ARA, American Rheumatism Association; EULAR, European League Against Rheumatism; IBD, arthropathy associated with inflammatory bowel disease; ILAR, International League Against Rheumatism; JAS, juvenile ankylosing spondylitis; JPsA, juvenile psoriatic arthropathy.
Name for the disease groupJuvenile chronic arthritis (JCA)Juvenile rheumatoid arthritis (JRA)Juvenile idiopathic arthritis (JIA)
JAS, JPsA, IBDIncluded (separately listed)ExcludedIncluded
Duration of joint symptoms necessary for the diagnosis of arthritis3 months6 weeks6 weeks
Age of the patient at disease onset0 to 15 years0 to 15 years0 to 15 years
Exclusion of other diseasesYesYesYes
Definition of subtypes at 6 months’ disease durationYesYesYes