ANA: antinuclear antibody; IBD: inflammatory bowel disease; ILAR: International League of Associations for Rheumatology; JIA: juvenile idiopathic arthritis; PRINTO: Pediatric Rheumatology International Organization; RA: rheumatoid arthritis; RF: rheumatoid factor.
* PRINTO classification criteria do not include a category for patients with psoriatic arthritis.
¶ Meets criteria for more than one category of JIA.