Table 1 Characteristics of children with juvenile idiopathic arthritis and controls

Gender, boys (%)

26 (34 %)

49 (37 %)

Age, years

10.0 ± 1.4

10.4 ± 1.2

−0.75

−0.02

0.04

Weight, kg

35.6 ± 9.0

38.5 ± 9.1

−5.47

−0.34

0.03

Height, cm

143.3 ± 10.1

148.5 ± 9.7

−7.93

−2.31

<0.01

BMI, kg/m²

17.1 ± 2.9

17.3 ± 2.6

−0.89

0.64

0.75

Physical activity

• Physical activity level (per day)

1.6 ± 0.2

1.8 ± 0.2

−0.25

−0.14

<0.01

• Time spent in MVPA (hours/day)

1.3 ± 0.8

2.1 ± 1.2

−1.02

−0.47

<0.01

• Sedentary time (hours/day)

19.3 ± 1.3

18.2 ± 1.3

0.69

1.43

<0.01

Total days per week meeting public health recommendations

3.9 ± 1.7

4.9 ± 1.6

−1.45

−0.54

<0.01

Time since diagnosis (years)

3.6 ± 2.7

Disease activity

 VAS physicians global assessment (cm)

0.3 (0–0.9)

 Number of active joints

1.0 (0–1.0)

  Upper extremity

0 (0–0)

  Lower extremity

1.0 (0–1.0)

Number of limited joints

1.0 (0–2.0)

Functional ability (CHAQ)

0.3 (0.1–0.8)

VAS pain (cm)

1.5 (0.2–3.9)

VAS well-being (cm)

0.8 (0.2–2.6)