Figure 2: Multivariate analysis. Grey circle: CKD 3A female ratios, black circle: CKD 3A male ratios, grey reversed triangle: CKD 4 male ratios, white square: CKD 3B4 female ratios, grey triangle: CKD 3B male ratios. All data are auto-scaled. 2A: Principal component analysis (PCA) based on all 13 differentially expressed proteins followed by Kohonen’s self-organising map (SOM) and hierarchical cluster analysis (HCA) using the unweighted pair method and the Euclidean distance. 2B: PCA, SOM and HCA based on expression of 8 differentially expressed proteins. 2C: PCA, SOM and HCA based on expression of AMBP, APOD, AZGP1 and KNG1.