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Figure 5 Graph presenting the CART model constructed with the independent risk factors for cardiac events. The area of a circle is proportional to the size of the subgroup. Numbers within the circles indicate adverse outcome rate in percent for the given subdivision. The analysis identifies at each level two subgroups with a statistically significant difference in adverse outcome rate. The number of operators that contributed to procedures corresponding to the six terminal nodes of the CART was 9, 9, 10, 9, 9 and 9, respectively (from the left to the right). Pts = patients; Proc./Y = procedures per year; LV Func. = left ventricular function. Note the effect of operator yearly volume of stenting procedures on the outcome of patients.