Comparison of N classification, 
The comparison of LN status indicators in training cohort is shown in Table Prognostic efficiency of different lymph node status indicators in training cohortAbbreviations: AIC, Akaike information criterion; AUC, area under the curve; C‐index, concordance index; LNR, lymph node ratio; LODDS, log odds of positive lymph node; PLN, positive lymph node.