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Table 1 Prevalence of autoantibodies during the first year of disease in 192 patients from the Nordic juvenile idiopathic arthritis database classified after a median of eight years of disease according to the ILAR* criteria

From: Anti-type II collagen antibodies, anti-CCP, IgA RF and IgM RF are associated with joint damage, assessed eight years after onset of juvenile idiopathic arthritis (JIA)

ILAR* category Total cohort n (%) Girls/boys n (% girls) IgM RF- positive n (%) IgA RF-positive n (%) IgG anti-CCP positive n (%) IgG anti-collagen II positive n (%)
Systemic 9 (4.7%) 5/4 (55%) 1 0 1 0
Oligoarticular persistent 90 (46.9%) 60/30 (66.6%) 2 - - 2
Oligoarticular extended 8 (4.2%) 8/0 (100%) 1 1 1 -
Polyarticular RF-negative 40 (20.8%) 30/10 (75.0%) - 1 1 2
Polyarticular RF-positive 1 1/0 1 1 - -
Juvenile psoriatic arthritis 1 0/1 - - - -
Enthesitis-related arthritis 15 (7.8%) 5/10 (33.3%) - 2 1 1
Undifferentiated arthritis 28 (14.6%) 24/4 (85.7%) 2 1 1 1
Total 192 133/59 (69.3%) 7 (3.6%) 6 (3.1%) 5 (2.6%) 6 (3.1%)
  1. *International League of Associations for Rheumatology classification criteria [2].