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Graph showing receiver operating characteristic (ROC) analyses for the Spetzler-Martin grading system (blue curve) and the Supplemented Spetzler-Martin grading system (red curve) in the combined cohort of 1009 patients. The predictive accuracy of the Supplemented Spetzler-Martin grading system was greater than that of the Spetzler-Martin grading system: AUROC = 0.75 vs 0.69, respectively; p < 0.001.
