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Figure 4 Risk stratification of the 165 stenoses of intermediate severity. Stenoses of intermediate severity (SIS) were defined as stenoses ranging from 40% to 70% diameter reduction. It is based on the combination of the two independent predictors of occlusion at 3-year follow-up (Table 3). The threshold value of these variables was arbitrarily defined as the lower limit of the tercile that yielded a prevalence of culprit lesions above 25% in univariate analysis (Fig. 2). Consequently, the low-risk pattern was defined as a symmetry index <68° and a maximal outflow angle <27° and the high-risk pattern as a symmetry index  68° and a maximal outflow angle 27°. Mean values ± SD are given for both stenosis variables. See text for the predictive values of the low-risk and high-risk models.
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