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Table 1 Clinical characteristics in a Nordic cohort of children with juvenile idiopathic arthritis, classified according to the ILAR classification criteriab and followed for at least seven years

From: Psoriasis and associated variables in classification and outcome of juvenile idiopathic arthritis - an eight-year follow-up study

Clinical characteristics
  Number of patients n Age at onset median (IQR) Psoriasis n Psoriasis- like rash n Dactylitis n Nail pitting n Patients assessed for heredity n First-degree heredity for psoriasis or psoriatic arthritis n (%)
Systemic arthritis 18 4.5 (2.2-6.7) - - - - 18 -
Oligoarticular persistent 133 5.1 (2.6-8.5) - 1 6 3 123 -
Oligoarticular extended 78 4.1 (1.8-8.4) - 2 1 3 74 -
Polyarticular RF negative 80 4.9 (2.2-9.1) - 2 7 - 79 -
Polyarticular RF positive 3 10.2, 13.2, 13.3 - - - - 3 -
Psoriatic arthritis 14 5.8 (4.3-7.9) 8 3 3 7 14 9 (64.3)
Enthesitis-related arthritis 49 10.0 (6.8-12.3) - 3 1 2 47 -
Undifferentiated arthritis 65 7.8 (3.2-11.8) 6a 2 6 3 57 51 (78.5)
  1. aNone of the six patients with psoriasis at the 8-year follow-up fit any category, four because of mutual exclusion from JPsA and ERA because of enthesitis, one because he was a HLA-B27-positive boy older than 6 years at onset, one because of positive RF
  2. bInternational League of Associations for Rheumatology classification criteria [10] assessed at last study visit (median 98, range 84–147 months)