Table 2

Classification according to adult rheumatic diseases

Onset ILAR categoryAdult rheumatic disease classification at the last visit
RAASUSpAEAPsAASDNon-classifiable
Systemic, n=392 (5.1%)000036 (92.3%)1 (2.6%)
RF− poly, n=6336 (57.1%)2 (3.8%)2 (3.8%)08 (12.7%)015 (23.8%)
RF+ poly, n=6865 (95.6%)1 (1.5%)001 (1.5%)01 (1.5%)
P. oligo, n=664 (6.1%)5 (7.6%)9 (13.6%)4 (6.1%)5 (7.6%)039 (59.1%)
E. oligo, n=5421 (38.9%)2 (3.7%)10 (18.5%)1 (1.9%)1 (1.9%)019 (35.2%)
ERA, n=76041 (53.9%)21 (27.6%)4 (5.3%)6 (7.9%)04 (5.3%)
PsA, n=13000012 (92.3%)01 (7.7%)
Undif, n=63 (50%)1 (16.7%)01 (16.7%)001 (16.7%)
Total131 (34%)52 (13.5%)42 (10.9%)10 (2.6%)33 (8.6%)36 (9.4%)81 (21%)
  • AS, ankylosing spondylitis; ASD, adult Still disease; E. Oligo, extended oligoarthritis; EA, enteropathic arthritis; ERA, enthesitis-related arthritis; ILAR, International League of Associations for Rheumatology; JIA, juvenile idiopathic arthritis; P. Oligo, persistent oligoarthritis; PsA, psoriatic arthritis; RA, rheumatoid arthritis; RF− Poly, rheumatoid factor negative polyarthritis; RF+ poly, rheumatoid factor positive polyarthritis; Undif, undifferentiated arthritis; USpA, undifferentiated spondyloarthritis.