Table II.

Assignment values of the univariate logistic regression analysis.

Variables	Project code	Assignment value
Gender	X1	Female, 0; male, 1
Pathological type	X2	Adenocarcinoma, 1; squamous cell carcinoma, 2; large cell carcinoma, 3
Clinical stage	X3	Ia, 1; Ib, 2; IIa, 3; IIb, 4; IIIa, 5; IIIb, 6; IV, 7
Degree of differentiation	X4	Poorly-differentiated, 1; poorly- to moderately-differentiated, 2; moderately-differentiated, 3; well-differentiated, 4
Lymph node metastasis	X5	No, 0; yes, 1
Distant metastasis	X6	No, 0; yes, 1
Pleural effusion	X7	No, 0; yes, 1
Family history of cancer	X8	No, 0; yes, 1
Occupational exposure	X9	No, 0; yes, 1
Chemotherapy	X10	No, 0; yes, 1
Surgery	X11	No, 0; yes, 1
Radiotherapy	X12	No, 0; yes, 1
Age, years	X13	Specific data
Tumor volume	X14	Specific data
Smoking index	X15	Specific data
EGFR mutation	Y	No, 0; yes, 1

EGFR, epidermal growth factor receptor.