Fig. 2From: Serum complement 3 is a potential biomarker for assessing disease activity in Takayasu arteritisThe cluster analysis and principal component analysis for variables associated with disease activity in TA. a Scree plot to explore the optimal number of the clusters. b Cluster analysis of the patients. c Scree plot to explore the optimal groups of the principal component analysis. d Principal component analysis based on the variablesBack to article page