Table. Risk of Death From Breast Cancer in Non-Hispanic African American Women With Triple-Negative Breast Cancer Compared With Non-Hispanic White Counterparts.

Characteristic	Person-years	Deaths	HR (95% CI)a
Overall
White	59 488	2289	1 [Reference]
African American	19 048	987	1.16 (1.06-1.25)
Age, <65 y
White	39 046	1300	1 [Reference]
African American	14 617	735	1.24 (1.12-1.37)
Age ≥65
White	20 442	989	1 [Reference]
African American	4430	252	0.99 (0.86-1.15)
P value for interaction	NA	NA	.01
Privately insuredb
White	33 879	1013	1 [Reference]
African American	10 631	455	1.27 (1.13-1.43)
Uninsured or Medicaid-insuredb
White	4639	266	1 [Reference]
African American	3805	271	1.18 (0.97-1.42)
P value for interaction	NA	NA	.27
Socioeconomically less deprived countiesc
White	48 268	1762	1 [Reference]
African American	12 427	670	1.26 (1.14-1.39)
Socioeconomically more deprived countiesc
White	11 220	527	1 [Reference]
African American	6621	317	0.93 (0.80-1.08)
P value for interaction	NA	NA	<.01
Urban counties
White	51 369	1935	1 [Reference]
African American	17 555	923	1.21 (1.11-1.32)
Rural counties
White	8118	354	1 [Reference]
African American	1493	64	0.72 (0.53-0.96)
P value for interaction	NA	NA	<.01
No surgery
White	1785	262	1 [Reference]
African American	796	161	1.23 (0.99-1.51)
Surgical treatment
White	57 601	2016	1 [Reference]
African American	18 232	820	1.12 (1.02-1.22)
P value for interaction	NA	NA	.44
No radiation therapy
White	27 835	1256	1 [Reference]
African American	8342	530	1.17 (1.04-1.30)
Radiation therapy
White	31 653	1033	1 [Reference]
African American	10 705	457	1.13 (1.00-1.28)
P value for interaction	NA	NA	.59

Abbreviations: HR, hazard ratio; NA, not applicable.

^aModels were adjusted for age, type of health insurance, county-level socioeconomic deprivation, rural residency, cancer stage, tumor grade, surgery, radiation therapy, and chemotherapy.

^bThe analysis was restricted to patients younger than 65 years.

^cCounty-level socioeconomic deprivation was dichotomized using the median.