Table 3 Multivariate analyses of factors related to 5-year disease-specific survival in tongue SCC patients with lymph node metastasis.

Clinicopathological factors	Hazard ratio	P-value	95% CI
Number of ipsilateral positive nodes (≥ 4 vs. ≤ 3)	1.83	0.38	0.48–8.20
Level of ipsilateral positive nodes (Level IV or V vs. Level I, II, or III)	12.46	< 0.01	3.17–50.45
ENE of ipsilateral positive nodes (Positive vs. Negative)	1.66	0.36	0.56–5.23
Contralateral cervical LNM (Presence vs. Absence)	2.19	0.19	0.67–6.49
LLNM (Presence vs. Absence)	5.87	< 0.01	2.09–17.09
Postoperative treatment (Positive vs. Negative)	1.13	0.86	0.29–4.89

Analyses performed using Cox proportional hazards model.
SCC squamous cell carcinoma, CI confidence interval, LNM lymph node metastasis, LLNM lingual lymph node metastasis, ENE extranodal extension.
P < 0.05 is considered statistically significant.

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