Table 3.

Population characteristics for U.S. women age 30+ with travel times of >30 minutes to the nearest breast imaging service, by modality.

	Population of women age 30+ with travel time > 30 minutes to nearest breast imaging
	Mammography		Ultrasound		MRI
	N	%	N	%	N	%
Overall Population Female 30+ yrs.	4,806,401	5.2	5,334,450	5.7	18,416,748	19.8
Race/Ethnicity1
White	8,683,736	12.6	9,641,718	14.0	32,024,916	46.5
Black	751,165	6.4	813,595	7.0	3,042,035	26.1
Asian	93,680	2.2	99,339	2.4	310,812	7.4
Native American	289,731	39.6	312,932	42.8	615,520	84.2
Pacific Islander	7,920	7.2	8,247	7.5	23,447	21.3
Other	289,736	5.2	310,537	5.6	1,004,811	18.1
Hispanic	933,731	6.4	1,000,142	6.8	3,033,304	20.7
Rurality2
Urban Core	304,167	0.5	311,769	0.5	1,722,248	2.7
Suburban Areas	1,427,691	13.1	1,570,141	14.5	3,916,573	36.1
Large Town Areas	587,995	6.6	609,960	6.8	5,096,105	56.8
Small Town and Isolated Rural Areas	2,485,342	27.9	2,841,374	31.9	7,677,670	86.1
Education
Less than High School	736,666	5.0	816,596	5.5	2,790,177	18.8
High School	1,577,768	5.3	1,757,319	5.9	6,087,524	20.4
Some College	1,373,976	4.5	1,527,034	5.1	5,187,857	17.2
College	545,975	3.0	602,876	3.3	2,020,878	11.2
Graduate/Professional	271,940	2.7	297,437	2.9	1,024,573	10.2
Median Household Income3
4th Quartile	514,183	1.9	535,592	1.9	1,715,525	6.2
3rd Quartile	1,185,129	4.8	1,325,897	5.3	4,833,143	19.5
2nd Quartile	1,766,564	7.9	1,983,364	8.9	6,655,483	29.9
1st Quartile	1,337,311	7.3	1,486,371	8.1	5,207,115	28.5

¹Race and ethnicity are not mutually exclusive counts.

²419 (0.2%) of census tracts were coded at the county level. 92 census tracts, representing 29,489 women age 30 and over were missing RUCA codes.

³Median household income for quartiles: 4th quartile: $35,572 or less; 3rd quartile: >$35,5572-$49,500; 2nd quartile: >$49,500-$69,143; 1st quartile: >$69,143