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

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

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)	6^a	2	6	3	57	51 (78.5)

^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
^bInternational League of Associations for Rheumatology classification criteria [10] assessed at last study visit (median 98, range 84–147 months)

ISSN: 1546-0096