Table 1.

International League of Associations for Rheumatology (ILAR) Classification of Juvenile Idiopathic Arthritis (JIA)2)

One of the major aims of the ILAR classification is the mutual exclusivity of the subtypes. Therefore, the following list of possible exclusion for each category was defined:

a) Psoriasis or a history of psoriasis in the patient or first-degree relative.

b) Arthritis in an HLA-B27-positive male beginning after the sixth birthday.

c) Ankylosing spondylitis, enthesitis-related arhtiris, sacroiliitis with inflammatory bowel disease or acute anterior uveitis or a history of one of these disorders in a first-degree relative.

d) The presence of IgM rheumatoid factor and at least two occasions at least 3 months a part.

e) The presence of systemic JIA in the patient

RF, Rheumatoid factor