Fig. 4

Decision tree based on the Minimum Inhibitory Concentration (MIC) of the antibiotics in the combination setting. Percentages displayed in terminal nodes indicate the proportion of observations in that node in favor of the proposed condition (i.e., synergy expected versus not expected). The number of instances in each terminal node is as follows: (1) 21; (2) 9; (3) 3; (4) 15.