. 2016 Feb 18;15:8. doi: 10.1186/s12942-016-0039-7

Table 1.

Sample characteristics of BCSC mammograms by woman, facility, and census-level characteristics

	Geographic level of variable	N	%	N missing
Total population		646,553
Woman-level characteristics
Age	Woman level			0
30–40		35,483	5.5
40–49		194,760	30.1
50–59		181,832	28.1
60–69		126,106	19.5
70–79		75,192	11.6
80+		33,180	5.1
Race/ethnicity	Woman level			119,624
White, non-Hispanic		372,016	70.6
Black, non-Hispanic		38,949	7.4
Hispanic		27,315	5.2
Asian		75,278	14.3
Native American		3040	0.6
Other		10,331	2
Education	Woman level			242,322
Less than high school		37,773	9.3
High school		83,888	20.8
Some college		100,696	24.9
College or post-college graduate		181,874	45
Census-level^b characteristics
Rurality	Census^b: 2006 zip code			238
Urban core		452,224	70
Suburban areas		41,888	6.5
Large town areas		93,165	14.4
Small town and isolated rural		59,038	9.1
Median household income	Census^b: Block group			503
<45K		144,480	22.4
45–59,999K		139,912	21.7
60–84,999K		198,303	30.7
85K+		163,355	25.3
Diversity index	Census^b: Tract			503
0–25		148,217	22.9
26–50		158,971	24.6
51–75		243,632	37.7
76–100		95,230	14.7
Average spent on public transportation	Census^b: Block group		503
<100$		364,469	56.4
>100$		281,581	43.6
Median travel time to work	Census^b: Block group			3
<15 min		51,038	7.9
15–30 min		473,988	73.3
>30 min		121,524	18.8
Actual facility^a characteristics
Academic status	Facility level^a			172,334
Academic		65,966	13.9
Non-academic		408,253	86.1
Practice type	Facility level^a			172,334
Multispecialty		126,331	26.6
General radiology		330,449	69.7
Breast imaging only		13,370	2.8
Non-radiology		4069	0.9

^aFacility where the exam took place

^bCensus-level variable for woman’s place of residence