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The receiver operating characteristic (ROC) curves of the multivariable logistic regression model for the prediction of lymph node metastasis (LNM) in esophageal squamous cell carcinoma (ESCC) in the training cohort (A) and the validation cohort (B). Notes: Values outside parentheses represent cut-off values; and the first and second values in parentheses indicate sensitivity and specificity, respectively. AUC indicates area under the receiver operating characteristic curve.
