Table 5. Multivariable survival analysis of overall survival (main effect).

Number of observations in the original data set = 1,861. Number of observations used = 1,861.Backward selection with an alpha level of removal of .05 was used. The following variables were removed from the model: sex, year of diagnosis, and race group.

Bolded p values are statistically significant.

Abbreviations: —, not applicable, AJCC, American Joint Committee on Cancer; CI, confidence interval; HR, hazard ratio; REF, reference.