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Table 1 Characteristics of children with juvenile idiopathic arthritis and controls

From: Physical activity in children with Juvenile Idiopathic Arthritis compared to controls

  JIA (n = 76) Controls (n = 131) 95 % CI lower 95 % CI upper P
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)     
  1. Values are the mean ± standard deviation. For disease activity, number of limited joints, functional ability, VAS pain and VAS well-being values are in median (25th and 75th percentiles). Number of valid observations for age in controls n = 127, height and BMI in controls n = 129
  2. JIA juvenile idiopathic arthritis, CI confidence interval, MVPA moderate to vigorous physical activity, BMI body mass index, CHAQ childhood health assessment questionnaire, VAS visual analogue scale, cm centimeter, kg kilogram, m meter Number of days per week meeting public health recommendations were counted per day of which at least 1 h of MVPA was present