Fig. 3From: A comprehensive multivariate analysis of the center of pressure during quiet standing in patients with Parkinson's diseaseSummary 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 clusterBack to article page