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Three-class (one-vs-rest) Receiver operating characteristic (ROC) diagram of the external validation cohort of the radiomics prediction model. Class 0 is the very low- and low-risk group, class 1 is the intermediate-risk group, and class 2 is the high-risk group. The two dashed lines respectively show the ROC curves of micro-average and macro-average, indicating the overall distinguishing ability of the three-class classification.
