Fig 2. Decision tree to differentiate non-fibrotic individuals (F1) from individuals with significant fibrosis (F2 and above) in HIV/HCV co-infection.

Biomarker pattern based on CART analysis was used to generate candidate diagnostic algorithms. The numbers on the root node, the descendant nodes and the terminal nodes represent the mass values in followed by the intensity value. Non-fibrotic individuals = Class 1, individuals with significant fibrosis = Class 2.