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Graph showing receiver operating characteristic (ROC) analyses for the Supplemented Spetzler-Martin grading system in the combined replication cohort of 709 patients from all 4 institutions (orange curve) and the original cohort of 300 UCSF patients used to generate the SM-Supp model (green curve). There were no significant differences in predictive accuracy in these two groups (AUROC 0.7482 vs. 0.7428, respectively, p=0.887).
