Table 1.
Demographics of the JIA subgroups
| Total | ERA | Oligoarthritis | Extended | Persistent | RF− | RF+ | JPsA | sJIA | uJIA | |
|---|---|---|---|---|---|---|---|---|---|---|
| Number of patients (% of total) | 251 (N/A) | 22 (8.8%) | 112 (44.6%) | 28 (11.2%) | 84 (33.5%) | 35 (13.9%) | 17 (6.8%) | 17 (6.8%) | 7 (2.8%) | 41 (16.3%) |
| Female (%) | 66.5 | 36.4 | 69.6 | 67.9 | 70.2 | 74.3 | 70.6 | 76.5 | 57.1 | 63.4 |
| Age at debut (years (25–75 centiles)) | 7.3 (2.3–11.5) | 10.7 (6.5–13.2) | 4.0 (2.0–9.9) | 6.4 (1.9–10.3) | 3.7 (2.0–9.7) | 5.6 (1.9–11.2) | 12.7 (10.7–14.5) | 9.7 (5.5–12.2) | 8.3 (3.1–9.5) | 6 (2.8–11.8) |
| Follow-up time (years (25–75 centiles)) | 8 (6–11) | 7 (6–11) | 8 (6–11) | 10 (7–13) | 8 (6–10) | 8 (7–11) | 9 (7–12) | 8 (5.5–10) | 4 (1–6) | 9 (7–11) |
| Disease duration at diagnosis (months (25–75 centiles)) | 5 (2–14) | 9 (3.5–23.5) | 5 (2–14) | 9 (3–27) | 4 (2–10) | 6 (2–13) | 5 (2–23) | 14 (5.5–47.5) | 2 (0–4) | 4 (1–8.5) |
| ANA (%)* | 50.6 (100) | 27.2 (100) | 67.9 (100) | 53.6 (100) | 72.6 (100) | 48.6 (100) | 23.5 (100) | 23.5 (100) | 14.3 (100) | 46.3 (100) |
| RF (%)* | 10.8 (90.0) | 0 (90.9) | 4.5 (89.3) | 14.3 (92.9) | 1.2 (88.1) | 0 (94.3) | 100 (100) | 5.9 (82.4) | 0 (85.7) | 9.8 (87.8) |
| aCCP (%)* | 6.8 (66.1) | 4.5 (77.3) | 1.8 (63.7) | 7.1 (67.9) | 0 (61.9) | 2.9 (80.0) | 70.6 (94.1) | 0 (64.7) | 0 (28.6) | 2.4 (51.2) |
| HLAB27 (%)* | 14.7 (45.0) | 81.8 (90.9) | 4.5 (34.8) | 3.6 (42.9) | 4.8 (32.1) | 8.6 (54.3) | 0 (35.3) | 5.9 (41.2) | 0 (14.3) | 24.4 (51.2) |
*Data coverage presented in the parenthesis