|
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)
|
-
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)
