Figure 1:

principal component analysis of clinical and biochemical variables, and serum cytokines, in patients with SIRS and sepsis. (A) Principal component analysis (PCA) of clinical and biochemical variables, for patients grouped into SIRS and sepsis. (B) PCA of clinical and biochemical variables, for patients grouped according to their underlying disease origin. (C) PCA of serum cytokines, for patients grouped into SIRS and sepsis. (D) PCA of serum cytokines, for patients grouped according to their underlying disease origin; the “urinary” cluster is not shown in (B) because it does not influence the first component in this PCA. The explained percentage of the total variance for each component is shown in parentheses.