Figure 4.

Principal component analysis results show stratification of MSI+ patients and reflect within-group heterogeneity in severity and speech features. Gray arrows indicate individual loadings for each quantitative variable. Group membership was connoted by shape and outline color, fill shaded based on Sentence Intelligibility Test (SIT) scores (%). For the MSI+ group only, individual patients are indicated with case numbers for cross-referencing purposes. PC1 = Component 1 (% variance explained); PC2 = Component 2 (% variance explained).