The Kolmogorov–Smirnov test showed a not normal distribution of the variables; therefore, a non-parametric approach was adopted. The Chi2 test was applied referring to the categorical variables to compare JIA and control groups. The relationship analysis between the MRI findings and the mean duration of disease was performed through the Chi2 test. With reference to numerical variables, the Mann–Whitney test was applied to compare the groups. In order to assess any significant interdependence between the mean disease duration and VAS vs. the other clinical parameters, the Spearman correlation test was used.
All numerical variables are reported as median and interquartile range (IQR), whereas the categorical data are presented as numbers and percentages. Statistical analyses were performed using SPSS 25.0 statistical software for Windows (SPSS Inc., Chicago, IL, USA). p-values < 0.05 were considered statistically significant.
All numerical variables are reported as median and interquartile range (IQR), whereas the categorical data are presented as numbers and percentages. Statistical analyses were performed using SPSS 25.0 statistical software for Windows (SPSS Inc., Chicago, IL, USA). p-values < 0.05 were considered statistically significant.