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Table 2 Results of multivariate analysis: risk factors for distant metastasis in nasopharyngeal carcinoma

From: Correlation between nasopharyngeal carcinoma tumor volume and the 2002 International Union Against Cancer tumor classification system

Variables Hazard ratio 95% confidence interval p value
Primary tumor volume 1.012 1.003-1.022 0.007
T classification T1 1.0 ref 0.152
 T2 6.291 0.827-47.863  
 T3 8.690 1.146-65.888  
 T4 7.488 0.882-63.574  
N classification N0 1.0 ref <0.001
 N1 2.009 1.018-3.962  
 N2 4.095 2.080-8.063  
 N3 11.931 3.454-41.220  
  1. Abbreviations: ref indicates reference.