Table 1 Univariate analyses of correlation between clinicopathological features and LLNM in tongue SCC patients with lymph node metastases.

Clinicopathological features	Cervical LNM without LLNM (n = 107)	Cervical LNM and LLNM (n = 21)	P-value
Age			0.58*
< 60 years	49	11
> 60 years	58	10
Sex			0.63*
Male	76	16
Female	31	5
cT			0.23*
T1 + T2	80	13
T3 + T4	27	8
Pathological differentiation			0.72*
Well	41	7
Moderate	36	9
Poor	26	5
Unknown	4	0
Number of ipsilateral positive nodes			< 0.01*
< 3	89	11
≥ 4	18	10
Level of ipsilateral positive nodes			0.02**
Level I, II, or III	103	17
Level IV or V	4	4
ENE of ipsilateral positive nodes			0.02*
Negative	60	6
Positive	47	15
Contralateral cervical LNM			< 0.01*
Absence	98	15
Presence	9	6

SCC squamous cell carcinoma, LNM lymph node metastasis, LLNM lingual lymph node metastasis, ENE extranodal extension.
*Chi-square test.
**Fisher’s exact test. P < 0.05 is considered statistically significant in all analyses.

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