Data analysis
cognitive fatigue, V0-V1-V2-V3, arthritis, pain
REGRESSION, SECONDARY, ARTHRITIS, DISEASE
Quantitative data will be described as means and standard deviation, or median and range. Qualitative variables will be described as number and percentage, for each response category. No statistical test will be performed to compare the parameters between the two groups (no comparative study).The mean difference in the primary endpoint between V0 and V1 (with 95% confidence interval) will be calculated in the two groups. Paired t-tests or Wilcoxon signed ranks tests will be used to test the hypothesis of an effect of the APA program in the intervention group.The secondary endpoint analysis:The mean difference (and the 95% confidence interval) in the level of physical activity, expressed in Counts/min, between V0 and V1 will be calculated. The physical activity level will be presented graphically for each measurement time and for each group.The number of meters walked on average per month will be presented graphically for each measurement time, in the experimental arm only.Average scores on the JADAS-27, CHAQ-38 (9 activity items evaluated and score of functional incapacity, pain, and the parent or patient global assessment of arthritis), Peds-QL (sub-score physical and psychological health) and PedsQL-MFS (sub-score sleep quality, general and cognitive fatigue) with standard deviations will be presented graphically for each measurement time (V0-V1-V2-V3) for each group, and also by age group (6-7 years, 8-12 years, 13-17 years) within each group.As an exploratory basis, if the data are amenable, univariable linear regression model will be used to test the variables potentially associated with progression of disease activity, physical activity, and quality of life (age, body mass index, number of swollen joints).The percentage of patients accepting to participate to the study among the eligible patients, the percentage of patients completing the program, the percentage of patients completing exercises sessions will be calculated.The mean percentage of sessions in which patients participate and the mean percentage of prescribed exercises performed during the session will be also calculated.