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Receiver operating curves to demonstrate the diagnostic performance of the independent predictive factors for tumor recurrence in both (A) 1-mm and (B) 5-mm CT data. The overall C-indices for 1-mm and 5-mm thickness CT images using two parameters (area and mean attenuation of tumors) are 0.80 (95% CI, 0.72–0.90) and 0.81 (0.72–0.90), respectively. AUC, area under the curve (C-index); CI, confidence interval.
