Multivariate analysis using logistic model for EGFR mutation testing (PPS).

OR: odds ratio; CI: confidence interval For patients who provided both histology and cytology samples, test results from histology samples were used. The significance level for variable selection was 0.01. NX in regional lymph nodes were excluded from the analysis. The number of patients used for this analysis was 725. Multivariate analysis using logistic model for EGFR mutation testing (PPS).