Fig. 3

Summary of the results of the exploratory factor analysis. A Comparison of factor scores by clinical classification. Data are mean ± SD. *p < 0.05, **p < 0.01 by post-hoc test (Steel–Dwass test) and Kruskal–Wallis test. Scatterplots: the FA in each cluster with 95% confidence ellipsoids and ellipses. Upper right radar chart: the z-scores of the main variables for each factor. The clinical classification shows that each variable has a large overlap in PD severity. B Comparison of factor scores by clusters (as in the right part of Fig. 1). Upper right radar chart: the z-scores of the main variables for each factor. For the categories by clusters, the different shapes of the radar chart show the independence and characteristics of each cluster