Table 3. Multivariate analysis of 156 N2-3 stage patients with EBV DNA≥4000 copies/ml.

Characteristics	OR	95%CI	P value
Age	1.381	0.664-2.874	0.387
Gender	0.509	0.23-1.161	0.109
T stage	1.178	0.672-2.067	0.567
Clinical stage	1.559	0.907-2.679	0.108
Treatment arm	0.451	0.216-0.941	0.034

Abbreviations: EBV DNA= Epstein-Barr virus deoxyribonucleic acid; OR=odds ratio.