Fig. 3
From: Interleukin-27: a novel biomarker in predicting bacterial infection among the critically ill
The classification tree includes interleukin-27 (IL-27), procalcitonin (PCT), and immunocompromised status (I.C.) as predictor variables. The biomarker concentrations are presented in nanograms per milliliter. The root node provides the total number of subjects, and the number of subjects with negative and positive blood cultures, with the respective rates. Each daughter node provides the respective decision rule criterion and the number of subjects with negative and positive blood cultures, with the respective rates. Terminal nodes (TN) TN1, TN3, and TN5 are considered low-risk terminal nodes (≤12 % risk of positive culture). TN2, TN4, TN6, TN7 and TN8 are higher-risk terminal nodes (≥12 % risk of positive) compared with the root node