Table 1 Demographic characteristics of the patients with juvenile idiopathic arthritis at the time of diagnosis and 1 year after the diagnosis

Number of patients (%)

Female sex, n (%)

62 (71)

HLA-B27 positivity, n (%)

23 (26)

Antinuclear antibody positivity, titer > or = 160, n (%)

41 (47)

JIA subtype, n (%)

Oligoarthritis, persistent

29 (33)

Oligoarthritis, extended

4 (4.5)

Polyarthritis, seronegative

43 (49)

Polyarthritis, seropositive

3 (3.5)

Enthesitis-related arthritis

8 (9)

Psoriatic arthritis

1 (1)

At diagnosis

At one year

Median (IQR)

Mean (SD)

Median (IQR)

mean (SD)

Age at diagnosis, years

5.8 (4.7–9.6)

6.6 (4.3)

Duration of arthritis symptoms at diagnosis, days

87 (47–185.5)

179 (276)

Active joint count

3 (1–8)

7 (9)

0 (0–1)

1 (4)

Physician’s global assessment, VAS 0 to 100 mm

21 (11–36)

25 (18)

2 (0–8)

6 (11)

Patient’s/parent’s assessment of global well-being, VAS  0 to 100 mm

16 (5–35)

22 (20)

3 (0–13.3)

9 (13)

CHAQ^c

0 (0–0.38)

0.2 (0.4)

0 (0–0.13)

0.1 (0.2)

Erytrocyte sedimentation rate, mm/h

13 (7–28)

20 (21)

6 (3–8)

8 (9)

C-reactive protein, mg/l

2 (2–17)

14 (28)

2 (2–2)

5 (19)

Leucocytes E9/l

7.4 (6.1–9.7)

8.1 (2.8)

5.8 (4.8–7.7)

6.3 (2.0)

Neutrophils E9/l

3.8 (2.8–5.1)

4.2 (2.0)

2.5 (2.0–3.7)

2.8 (1.2)

MRP8/14^d in serum, ng/ml

252 (180–317)

257 (115)

174 (113–244)

183 (103)

MRP8/14 in plasma, ng/ml

192 (100–344)

229 (168)

77 (100–136)

99 (91)

MRP8/14 in synovial fluid, ng/ml

1304 (993–1500)

1292 (409)