Table 1.
Demographic and laboratory features, given by median (interquartile range), of patients stratified by JIA subtype
| |
JIA |
IgM RF+ polyarthritis |
IgM RF- polyarthritis |
Oligoarthritis |
Systemic arthritis |
Psoriatic arthritis |
Enthesitis-related arthritis |
|---|---|---|---|---|---|---|---|
| n=95 | n=16 | n=36 | n=24 | n=13 | n=3 | n=3 | |
| Sex, no. females/males |
77/18 |
14/2 |
30/6 |
22/2 |
8/5 |
3/0 |
0/3 |
| Age, median (IQ range) |
12 (5–16) |
14.5 (9.8-16) |
12 (5.3-15.5) |
10 (4.3-12) |
10.5 (4.8-14.3) |
17 (15–17)* |
16 (5–17)* |
| Disease duration, median (IQ range) |
2 (0.5-6.5) |
0.5 (0.4-5.1) |
2.3 (0.6-6) |
2 (0.6-8.1) |
3.8 (1–9.5) |
4 (0–8)* |
2.5 (1–7)* |
| Tender/swollen joint count, median (IQ range) |
8 (2–10) |
10 (8–13) |
8 (6–12) |
1 (1–2) |
9 (1–22) |
2 (1–8)* |
2 (1–2)* |
| No. patients with joint damage (%) |
20 (20.8) |
5 (31.3) |
10 (27.8) |
1 (4.2) |
4 (30.8) |
0 (0.0) |
0 (0.0) |
| CRP, median (IQ range) mg/dl |
0.7 (0.3-1.9) |
2.6 (0.8-13.3) |
0.80 (0.3-4.8) |
0.8 (0.3-5.5) |
4.9 (2.2-16.3) |
0.7 (0.33-2.1)* |
0.4 (0.3-2.7)* |
| (% positive) |
(36.8) |
(50.0) |
(33.3) |
(25.0) |
(29.2) |
(33.3) |
(33.3) |
| ESR, median (IQ range) mm/hr |
16 (7–37) |
20 (8–31) |
14 (7–32) |
15 (7–31) |
30 (7–50) |
6 (6–32)* |
7 (2–7)* |
| (% positive) | (50.5) | (68.8) | (44.4) | (45.8) | (69.2) | (33.3) | (0.0) |
CRP: C-reactive protein; ESR: Erythrocyte sedimentation rate.
Cut-points for a positive value: CRP (≥0.8 mg/dl), ESR (≥15 mm/hr). *range is given due to small sample size.