. Author manuscript; available in PMC: 2013 Nov 28.

Published in final edited form as: Int J Radiat Oncol Biol Phys. 2012 Jul 3;85(3):10.1016/j.ijrobp.2012.05.033. doi: 10.1016/j.ijrobp.2012.05.033

Table 3.

Multivariate cox proportional hazards regression model

Variable	Likelihood ratio P value^*	Hazard ratioy^† (95% CI)
Outcome: Overall survival cohort: n=113
Tumor size >6 cm vs ≤6 cm	.517	0.83 (0.460-1.480)
Disease stage	.182
Stage IVA		1.32 (0.228-7.690)
Stage IIIA, IIIB		2.02 (0.472-8.662)
Stage IIB		1.05 (0.240-4.594)
Stage I		1.0
Radiofrequency hyperthermia administered	.685	0.88 (0.487-1.605)
Outcome: Disease-free survival cohort: n=109
Tumor size >6 cm vs ≤6 cm	.359	1.42 (0.671-3.023)
Disease stage	.942
Stage IVA		1.19 (0.192-7.428)
Stage IIIA, IIIB		0.84 (0.184-3.848)
Stage IIB		1.03 (0.232-4.543)
Stage I		1.0
Radiofrequency hyperthermia administered	.114	1.88 (0.838-4.203)

Abbreviation: CI = confidence interval.

P value for the likelihood ratio test of the null hypothesis that the regression coefficient is zero.

^†

Multivariate Cox proportional hazards regression model.