Table 6. Distribution of selected characteristics of patients subgroups cohort.

	<60		≥60
	χ2	P	χ2	P
sex	11.052	0.004**	7.385	0.025*
Grading	13.305	0.010*	3.554	0.470
T Grade	17.976	0.001**	8.494	0.075
TNM stage	22.716	0.001**	15.906	0.014*
Location of the tumor	2.962	0.564	3.063	0.547
Length	1.826	0.401	8.383	0.015*
Lymph node metastasis	0.878	0.645	5.067	0.079
Nerve involvement	0.499	0.779	0.298	0.862
Cardiac involvement	15.721	0.000**	10.085	0.006**
Vascular tumor thrombus	3.817	0.148	0.034	0.983

*P < 0.05.

**P < 0.01.