Table 5.

Summary data for Cox regression analysis of survival of patients with breast cancer from 1981 to 2010 at nine SEER sites

Variables	Categories	Univariate		Multivariate
		HR (95% CI)	P-value	HR (95% CI)	P-value
All 1981–1990
Age	N	1		1
	N+1	1.049 (1.047–1.050)	<0.001	1.051 (1.049–1.052)	<0.001
Race	White	1		1
	Black	1.274 (1.214–1.337)	<0.001	1.399 (1.331–1.471)	<0.001
	Others	0.711 (0.665–0.761)	<0.001	0.808 (0.754–0.865)	<0.001
SES	Low	1		1
	Medium	1.075 (1.046–1.104)	<0.001	1.072 (1.042–1.102)	<0.001
	High	1.104 (0.994–1.227)	>0.05	1.117 (1.005–1.241)	<0.05
Stages	Early	1		1
	Mid-late	2.765 (2.685–2.847)	<0.001	3.053 (2.964–3.1445)	<0.001
All 1991–2000
Age	N	1		1
	N+1	1.049 (1.049–1.050)	<0.001	1.053 (1.052–1.053)	<0.001
Race	White	1		1
	Black	1.349 (1.314–1.386)	<0.001	1.521 (1.4780–1.563)	<0.001
	Others	0.738 (0.712–0.764)	<0.001	0.8340 (0.810–0.870)	<0.001
SES	Low	1		1
	Medium	1.094 (1.077–1.112)	<0.001	1.044 (1.026–1.061)	<0.001
	High	1.182 (1.115–1.252)	<0.001	1.1435 (1.079–1.212)	<0.001
Stage	Early	1		1
	Mid-late	3.256 (3.201–3.312)	<0.001	3.685 (3.622–3.749)	<0.001
All 2001–2010
Age	N	1		1
	N+1	1.046 (1.045–1.047)	<0.001	1.051 (1.050–1.052)	<0.001
Race	White	1		1
	Black	1.652 (1.598–1.708)	<0.001	1.7173 (1.659–1.778)	<0.001
	Others	0.7801 (0.745–0.8178)	<0.001	0.910 (0.869–0.954)	<0.001
SES	Low	1		1
	Medium	1.214 (1.185–1.243)	<0.001	1.086 (1.060–1.113)	<0.001
	High	1.393 (1.289–1.505)	<0.001	1.363 (1.262–1.4723)	<0.001
Stage	Early	1		1
	Mid-late	4.946 (4.832–5.063)	<0.001	5.489 (5.361–5.620)	<0.001

Abbreviations: SEER, Surveillance, Epidemiology, and End Results; SES, socioeconomic status; N, any age group.