TABLE 1.

Cohort characteristics

		Overall		Non-Black		Black
		n = 32,626	%	n = 26,436	%	n = 6190	%
Time to first treatment, days	Median, IQR	27	15–40	26	15–38	30	17–47	**
Treatment >60 days	n, %	3027	9.3	2101	8.0	926	15.0	**
AHEC region	1	2680	8.2	1927	7.3	753	12.2	**
	2	3362	10.3	3269	12.4	93	1.3
	3	4879	15.0	3781	14.3	1098	17.7
	4	1941	6.0	1623	6.1	318	5.1
	5	1372	4.2	797	3.0	575	9.3
	6	3666	11.2	2695	10.2	971	15.7
	7	5263	16.1	4729	17.9	534	8.6
	8	3867	11.9	3141	11.9	726	11.7
	9	5596	17.2	4474	16.9	1122	18.1
First treatment	Chemotherapy	2923	9.0	2006	7.6	917	14.8	**
	Breast-conserving surgery	20,874	64.0	17,125	64.8	3749	60.6
	Mastectomy	8829	27.1	7305	27.6	1524	24.6
Age at diagnosis, years	Median, IQR	67	56, 74	68	58, 74	64	52, 71	**
	18–49	4629	14.2	3400	12.9	1229	19.9
	50–64	8409	25.8	6415	24.3	1994	32.2
	65–69	6716	20.6	5592	21.2	1124	18.2
	70+	12,872	39.5	11,029	41.7	1843	29.8
Stage at diagnosis	I	17,803	54.6	15,051	56.9	2752	44.5	**
	II	11,417	35.0	8917	33.7	2500	40.4
	III	3406	10.4	2468	9.3	938	15.2
Hormone receptor	Negative	5698	18.2	3947	15.6	1751	29.3	**
	Positive	25,602	81.8	21,379	84.4	4223	70.7
Insurance coverage	Any private	7854	24.1	6872	26.0	982	15.9	**
	Medicaid only	6831	20.9	3940	14.9	2891	46.7
	Medicare FFS only	15,527	47.6	13,649	51.6	1878	30.3
	Medicare Advantage	2414	7.4	1975	7.5	439	7.1
Distance to first treatment	<5 miles	8557	26.2	6661	25.2	1896	30.6	**
	5-<10 miles	7180	22.0	5742	21.7	1438	23.2
	10-<20 miles	7154	21.9	6083	23.0	1071	17.3
	>20 miles	9733	29.8	7949	30.1	1784	28.8
Social Deprivation Index quarter	1 (0–25)	6167	18.9	5756	21.8	411	6.6	**
Based on distribution in state	2 (25–50)	7448	22.9	6690	25.3	758	12.3
	3 (50–75)	10,848	33.3	9052	34.3	1796	29.0
	4 (75+)	8136	25.0	4915	18.6	3221	52.1
Urbanicity	Rural	8324	25.5	6681	25.3	1643	26.5	*
	Urban	24,302	74.5	19,755	74.7	4547	73.5

Column totals for hormone receptor status and social deprivation index may not sum to 100% because of missing data, χ² and Mann-Whitney U tests for Black-non-Black differences. Urbanity measured from Rural Urban Commuting Area definitions at the census tract level. Quarter is based on the distribution of the State.

Abbreviations: AHEC, Area Health Education Center; FFS, fee for service; IQR, interquartile range.

^*Significant difference in distribution of variable between Black and non-Black at a threshold of p < .05.

^**p < .01.