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Figure 3 Graph presenting the CART model constructed with the independent risk factors for an adverse outcome. 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 seven terminal nodes of the CART was 8, 9, 10, 3, 3, 10 and 10, respectively (from the left to the right). Pts = patients; Proc. = procedures; LV Func. = left ventricular function. Note the effect of operator volume of stenting procedures on the outcome of patients.
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