Table 3. Cox proportional hazards adjusting for age, sex, race, marital status, stage, and radiotherapy status.

Variable	HR	95% CI	P value
Age
<65 years	Ref
65+ years	1.652	1.410–1.937	0.000
Sex
Female	Ref
Male	1.528	1.310–1.782	0.000
Race
White	Ref
Black	1.354	1.125–1.629	0.001
Marital status
Married	Ref
Single	1.620	1.348–1.946	0.000
Other (S/D/W/U)	1.777	1.478–2.138	0.000
Stage
Localized	Ref
Regional	2.427	2.102–2.802	0.000
Radiotherapy
RT	Ref
None	1.220	1.013–1.470	0.036

Ref, reference; RT, radiotherapy; S/D/W/U, separated/divorced/widowed/unmarried or domestic partner; HR, hazard ratio; CI, confidence interval.