Table 2.

Comparison of baseline related data between the two groups of patients.

Item	LNM group (n = 171)	Non-LNM group (n = 118)	T/χ2	P
Age	61.74 ± 6.65	60.47 ± 6.75	1.586Δ	0.114
Gender
Male	69	49	0.040	0.842
Female	102	69
Primary tumor site
Head	73	56	0.642	0.423
Neck	98	62
Tumor size
<5	58	44	0.347	0.556
≥5	113	74
CT type
2	110	73	0.216	0.898
3	20	14
4	41	31
CN type
Negative	0	0	—	—
Positive	171	118
Paraneural invasion
Negative	52	40	0.392	0.531
Positive	119	78
Degree of pathological differentiation
Low	111	91	4.944	0.026
High	60	27
TMN staging
0	0	17	166.801	≤0.001
1	8	66
2	46	31
3	117	4
Vascular invasion
Negative	61	91	48.104	≤0.001
Positive	110	27

Δ: is expressed to perform an independent sample T-test, and the statistic was chosen as T.