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Table 4 Multivariate linear regression analyses to predict physical activity in children with juvenile idiopathic arthritis

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

  B 95 % CI lower 95 % CI upper P
PAL     
Reverence 1.81 1.72 1.90 <0.01
Age centered 10 years 0.06 0.03 0.09 <0.01
BMI centered 17 kg/m2 −0.01 −0.02 0.00 0.18
Gender −0.07 −0.14 0.01 0.08
JIA season −0.16 −0.23 −0.08 <0.01
Medication −0.01 −0.09 0.07 0.87
Disease activity −0.005 −0.012 0.003 0.83
Functional ability (CHAQ) −0.05 −0.15 0.04 0.27
VAS well-being −0.04 −0.07 −0.01 0.01
VAS pain 0.03 0.002 0.05 0.04
MVPA     
Reference 2.00 1.52 2.48 <0.01
Age centered 10 years 0.26 0.10 0.41 <0.01
BMI centered 17 kg/m2 0.001 −0.07 0.07 0.99
Gender −0.13 −0.51 0.25 0.51
JIA season −0.55 −0.96 −0.15 0.01
Medication 0.03 −0.39 0.44 0.90
Disease activity −0.01 −0.03 0.02 0.60
Functional ability (CHAQ) −0.50 −0.99 0.01 0.05
VAS well-being −0.16 −0.30 −0.02 0.03
VAS pain 0.13 0.01 0.26 0.03
Sedentary time     
Reference 18.70 17.94 19.46 <0.01
Age centered 10 years −0.28 −0.53 −0.04 0.02
BMI centered 17 kg/m2 0.16 0.05 0.27 <0.01
Gender 0.07 −0.54 0.67 0.83
JIA season 1.01 0.38 1.67 <0.01
Medication −0.29 −0.96 0.37 0.39
Disease activity 0.01 −0.03 0.05 0.69
Functional ability (CHAQ) 0.14 −0.65 0.94 0.72
VAS well-being 0.26 0.04 0.48 0.02
VAS pain −0.19 −0.38 0.00 0.05
  1. The regression equation for PAL is as follows:
  2. \( \begin{array}{l}\mathrm{PAL} = \mathrm{reference} + 0.06\ *\ \mathrm{age}\ \left(\mathrm{centered}\ 10\right) + \hbox{-} 0.01\ *\ \mathrm{B}\mathrm{M}\mathrm{I}\ \left(\mathrm{centered}\ 17\right) + \hbox{-} 0.07\ *\ \mathrm{gender} + \hbox{-} 0.16\ \\ {}*\ \mathrm{season} + \hbox{-} 0.01\ *\ \mathrm{medication} + \hbox{-} 0.005\ *\ \mathrm{disease}\ \mathrm{activity} + \hbox{-} 0.05\ *\ \mathrm{functional}\ \mathrm{ability}\ \left(\mathrm{CHAQ}\right) + \hbox{-} 0.04\ \mathrm{V}\mathrm{A}\mathrm{S}\ \\ {}\mathrm{well}\hbox{-} \mathrm{being} + 0.03\ *\ \mathrm{V}\mathrm{A}\mathrm{S}\ \mathrm{pain}. = \end{array} \)
  3. The reference in this equation a 10 year old boy with JIA, a BMI of 17 kg/m2 of which the data was collected in the summer and off medication
  4. JIA juvenile idiopathic arthritis, BMI body mass index, PAL physical activity level. MVPA: moderate to vigorous activity expressed in hours/day. Sedentary time expressed in hours/day. CI confidence interval of B. Reference category: Boy of 10 years, with a BMI of 17, with JIA, who filled in the diary in the summer period and is off medication. A lower score in well-being corresponds to a better well-being. CHAQ, childhood health assessment questionnaire