Table S2.

Summary data of race distribution by SES and calendar period in patients with breast cancer from 1981 to 2010 at nine SEER sites

Decades	SES	Number	Race (%)
			White	Black	Others
1981–2010
	Total	431,645	84.4	8.7	6.9
	Low poverty	256,390	90.9	4.1	5.0
	Medium poverty	167,501	74.1	16.2	9.7
	High poverty	7,774	84.4	8.7	6.9
1981–1990
	Total	115,896	88.2	7.4	4.4
	Low poverty	66,647	95.5	2.9	1.5
	Medium poverty	47,474	77.6	14.0	8.4
	High poverty	1,775	88.2	7.4	4.4
1991–2000
	Total	150,334	85.1	8.4	6.5
	Low poverty	87,897	93.0	3.8	3.2
	Medium poverty	59,802	73.1	15.6	11.3
	High poverty	2,635	85.1	8.4	6.5
2001–2010
	Total	165,415	81.1	9.9	8.9
	Low poverty	101,846	86.0	5.2	8.8
	Medium poverty	60,225	72.4	18.4	9.1
	High poverty	3,344	81.1	9.9	8.9

Abbreviations: SES, socioeconomic status; SEER, Surveillance, Epidemiology, and End Results.