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ROC curves to compare DAS versus NRS in our PCP scheme. The area under the ROC curve was 0.756 for DAS (the blue line) and 0.558 for NRS (green line), P<0.001. MP, mixed plaque; DAS, diamond-attenuation sign; NCP, non-calcified plaque; NRS, napkin-ring-sign; ROC, receiver-operating characteristic (95% CI: 0.717–0.791 vs. 0.514–0.600); PCP, plaque-calcification-pattern.
