Table 4.

The results of multiple linear regression analysis.

Independent variable	B	t value	P value
Age	0.03	0.39	0.698
Gender	0.071	0.452	0.693
Smoking history	0.251	1.768	0.083
Pathological type	−0.241	−1.755	0.085
TNM classification	−0.145	−1.127	0.264
Lymph node metastasis	0.046	1.794	0.078
Distant metastasis	0.031	0.097	0.923

F=1.884; p=0.097; R²=0.554; B – unstandardized coefficients.