Table 1 Demographic data for 51 children with juvenile idiopathic arthritis (JIA) and 18 healthy children

Age at inclusion, Md (IQR)

10.4 (5.6 – 15.2) *

9.4 (5.0 – 13.6)

5.6 (2.2 – 9.4) *

Age at onset, Md (IQR)

8.8 (3.2 – 13.5)

6.2 (3.0 – 11.5)

-

Sex (F/M), n (%)

34/17 (66.7)

12/6 (66.7)

3/15 (16.7)

Disease duration at inclusion, years, Md (IQR)

Disease duration at follow-up, years, Md (IQR)

0.6 (0.2 – 2.7)

-

-

1.2 (0.7 – 2.6)^a

-

-

ILAR categories, course type, n (%)

Oligoarticular persistent

25 (49)

7 (38.9)

-

Enthesitis-related arthritis

9 (17.6)

3 (16.7)

-

Polyarticular RF negative

7 (13.7)

3 (16.7)

-

Juvenile psoriatic arthritis

4 (7.8)

2 (11.1)

-

Oligoarticular extended

3 (5.9)

2 (11.1)

-

Polyarticular RF positive

3 (5.9)

1 (5.6)

-

Medical treatment at follow-up

Methotrexate

-

9

-

Etanercept

-

2

-

Etanercept + Methotrexate

-

5

-

No medical treatment

-

2

-