Characteristics of patients with juvenile psoriatic arthritis (JPsA) and nonpsoriatic juvenile idiopathic arthritis (JIA).
| Oligoarticular-onset JPsA, n = 31 | Oligoarticular-onset JIA, n = 31 | p | Polyarticular-onset JPsA, n = 21 | Polyarticular-onset JIA, n = 21 | p | |
|---|---|---|---|---|---|---|
| Female: male | 25:6 | 25:6 | 16:5 | 16:5 | ||
| Mean age at diagnosis, yrs (median) | 6.3 ± 3.4 (5.6) | 6.5 ± 3.9 (5.2) | 0.4* | 8.9 ± 4.5 (9.3) | 8.6 ± 4.4 (9.2) | 0.25* |
| Mean length of followup, yrs (median) | 6.6 ± 3.8 (6.2) | 6.7 ± 3.9 (5.2) | 0.9* | 5.8 ± 3.5 (5) | 6.2 ± 4.2 (5.1) | 0.56* |
| No. with positive ANA† | 18/28 | 16/28 | 0.8** | 9/17 | 13/20 | 0.5** |
| No. with positive HLA-B27 | 2/8 | 1/9 | 1.0** | 1/11 | 1/4 | 0.56** |
| No. with uveitis | 6 | 6 | 1.0** | 5 | 0 | 0.02** |
| No. with progression to polyarthritis | 12 | 11 | 0.8** | NA | NA | NA |
| Time to progression to polyarthritis, yrs (range) | 3.2 ± 2.3 (0.6–6.6) | 3.08 ± 4.6 (0.7–15.5) | 0.9** | NA | NA | NA |
| No. with dactylitis | 8 | 0 | < 0.01* | 8 | 4 | 0.25** |