Table 1.

Diagnostic mammogram-level characteristics, stratified by composite vulnerability score of the facility at which the mammogram was performed.

	Composite vulnerability score^a
	Non-vulnerable (score = 0)		Moderately vulnerable (score = 1 or 2)		Highly vulnerable (score = 3 or 4)
	N	%	N	%	N	%
Total number of unique women served	41,231		19,454		8,476
Total number of diagnostic mammograms	48,033		21,195		9,505
Age group, years
40 – 49	21,273	44.3	9,164	43.2	3,762	39.6
50 – 59	14,513	30.2	6,321	29.8	2,754	29.0
60 – 69	7,348	15.3	3,530	16.7	1,841	19.4
70 – 80	4,899	10.2	2,180	10.3	1,148	12.1
Breast density
1: Almost entirely fat	3,043	6.3	1,328	6.3	490	5.2
2: Scattered fibroglandular densities	16,709	34.8	8,793	41.5	4,766	50.1
3: Heterogeneously dense	22,635	47.1	8,726	41.2	3,370	35.5
4: Extremely dense	5,646	11.8	2,348	11.1	879	9.3
Time since previous mammogram
No previous mammogram	2,948	6.1	1,814	8.6	1,010	10.6
< 12 months	15,897	33.1	7,540	35.6	2,597	27.3
12 - 18 months	16,045	33.4	6,004	28.3	2,835	29.8
19 - 30 months	7,002	14.6	2,891	13.6	1,411	14.8
31 - 42 months	2,505	5.2	1,208	5.7	614	6.5
43+ months	3,636	7.6	1,738	8.2	1,038	10.9
Mammography result
Negative	43,703	91.0	18,776	88.6	8,419	88.6
Positive	4,330	9.0	2,419	11.4	1,086	11.4

Composite vulnerability scores were calculated by adding 1 for each of the following vulnerability indices met: Education: < 83% of the facility population completed high school; Race/ethnicity: > 30% of the facility population are minorities; Rural/urban residence: average percentage of rural residences among the facility population is > 52%; and Income: average median household income among the facility population is < $45,000.