. Author manuscript; available in PMC: 2016 Jul 1.

Published in final edited form as: Breast Cancer Res Treat. 2015 May 29;152(2):407–416. doi: 10.1007/s10549-015-3436-x

Table 3.

Multicovariate Cox regression model for overall survival without stratification

Parameter	Hazard ratio	95 % CI	P value
IBC versus non-IBC	1.406	1.137–1.740	0.0017
Ethnicity
Black versus White	1.489	1.243–1.784	<0.0001
Other versus White	1.207	0.977–1.491	0.0819
Age at diagnosis	1.007	1.001–1.013	0.0336
ECOG performance status > 1 versus 0 or 1^a	3.017	2.300–3.958	<0.0001
Hormone receptor positive versus negative^a	0.500	0.422–0.594	<0.0001
HER2 positive versus negative	0.635	0.536–0.752	<0.0001
Multiple metastases versus single metastasis^a	1.278	1.082–1.509	0.0059
Visceral versus nonvisceral metastases	1.226	1.035–1.453	0.0184
Locoregional surgery versus no locoregional surgery^a	0.399	0.331–0.481	<0.0001
Hormonal therapy versus no hormonal therapy^a	0.602	0.498–0.728	<0.0001

These variables violated the Cox model proportional hazard assumption