Table 2 Clinical characteristics of the study population at the 18-year study visit
From: Transitioning patients with juvenile idiopathic arthritis to adult care: the Nordic experience
|  | Directly transferred (D) (n = 163) | Later referred (L) (n = 50) | Not transferred (N) (n =195) | P-value [multiple comparison] * |
|---|---|---|---|---|
Female, n (%) | 116 (71) | 39 (78) | 124 (64) | 0.091 |
Age at onset, years, mean (SD) | 7.3 (4.2) | 7.7 (3.8) | 6.3 (4.1) | 0.029 [D/N] |
Age at follow-up, years, mean (SD) | 25 (4) | 25 (4) | 24 (4) | 0.30 |
Body mass index, kg/m2, mean (SD) | 24.4 (5.0) | 23.5 (4.3) | 23.8 (4.7) | 0.41 |
JIA categorya n (%) |  |  |  | < 0.001 [D/N, L/N] |
 Systemic onset | 3 (2) | 0 (0) | 11 (6) |  |
 Polyarthritis, RF+ | 3 (2) | 0 (0) | 3 (2) |  |
 Polyarthritis, RF- | 37 (23) | 8 (16) | 18 (9) |  |
 Juvenile psoriatic | 12 (7) | 4 (8) | 11 (6) |  |
 Enthesitis-related | 24 (15) | 6 (12) | 13 (7) |  |
 Undifferentiated | 25 (15) | 7 (14) | 29 (15) |  |
 Persistent oligoarthritis | 17 (10) | 12 (24) | 86 (44) |  |
 Extended oligoarthritis | 42 (26) | 13 (26) | 24 (12) |  |