Table 1 Demographics of the excluded patients and cohort presented in decreasing order of frequency of JIA category
Number of excluded patients n (%) | Mean age excluded patients at diagnosis (years) | Female excluded patients n (%) | Number of included patients n (%) | Median age included patients at diagnosis (years) | Female included patients n (%) | Pre-diagnosis symptom period average months (range) | Median joint count baseline (range) | ANA positive n/n done (%) | |
|---|---|---|---|---|---|---|---|---|---|
Oligoarticular | 12 (44) | 7.5 | 7 (58) | 48 (36) | 3.4 | 34 (71) | 3.9 (0.3–24.0) | 2 (1–4) | 36/47 (77) |
Polyarticular RF- | 1(4) | 9.9 | 0 (0) | 34 (25) | 9.0 | 26 (76) | 5.3 (0.5–24.0) | 8 (1–42) | 21/33 (64) |
Undifferentiated | 8 (30) | 8.4 | 4 (50) | 17 (13) | 12.3 | 7 (41) | 7.4 (0.5–24.0) | 5 (1–43) | 8/16 (50) |
Enthesitis related arthritis | 2(7) | 10.8 | 0 (0) | 13 (10) | 13.9 | 1 (8) | 11.2 (0.5–48.0) | 2 (1–18) | 0/7 (0) |
Systemic | 1(4) | 3.2 | 0 (0) | 10 (7) | 8.4 | 7 (70) | 1.4 (0.3–4.0) | 5 (0–22) | 3/8 (38) |
Psoriatic arthritis | 3(11) | 11 | 1 (33) | 9 (7) | 9.3 | 5 (56) | 9.9 (1.5–24.0) | 5 (1–36) | 2/7 (29) |
Polyarticular RF + | 0(0) | n/a | n/a | 3 (2) | 15.6 | 3 (100) | 7.5 (3.8–12.1) | 10 (7–44) | 2/3 (67) |
Overall | 27 | 9.2 | 12 (44) | 134 | 8.3 | 83 (62) | 5.7 (0.3–48.0) | 2 (0–44) | 72/121 (60) |