Table 3.

Selected characteristics of residents in US counties by rural–urban categories^a and by mammography capacity (0 machines vs.≥1 machine) in 2009

County rural–urban category and number	Counties	Women age ≥40 years 2009	Population density, 2009b		Percent white collar, 2000		Percent insured, 2007		Percent below poverty level, 2007		Household income inequality ratio, 2000c		Primary care physician density, 2008d
Mammography machines	n	n	Mean	SE	Mean	SE	Mean	SE	Mean	SE	Mean	SE	Mean	SE
Metropolitan
0 machines	195	1,034,399	137.3	39.4	49.7	0.5	79.7	0.4	15.2	0.4	8.5	0.7	25.7	2.9
≥1 machine	895	59,749,194	746	97.5	57.5	0.3	83.3	0.2	13.6	0.2	15.4	0.6	67.4	1.3
Suburban/small town
0 machines	198	651,460	47.3	11.8	46.5	0.4	79.3	0.5	20.3	0.5	3.9	0.2	37.5	2.5
≥1 machine	1,183	10,981,934	60	3.2	49.4	0.2	82.8	0.2	17.3	0.2	5.7	0.2	53.9	0.9
Rural
0 machines	477	824,823	12.5	0.7	50.2	0.3	77.8	0.3	17.8	0.3	4.1	0.1	27.6	1.6
≥1 machine	193	617,302	21.4	1.4	49.6	0.4	81.3	0.3	16.6	0.4	4.2	0.2	55.3	3.3
All counties by mammography machine status
0 machines	870	2,510,682	48.4	9.4	49.2	0.2	78.6	0.2	17.8	0.2	5.0	0.2	29.4	1.3
≥1 machine	2,271	71,348,430	327.1	39.1	52.6	0.2	82.9	0.1	15.8	0.1	9.4	0.3	59.3	0.8
All counties by population category
Metropolitan	1,090	60,783,593	637.1	80.6	56.1	0.3	82.7	0.2	13.9	0.2	14.2	0.5	59.9	1.3
Suburban/small town	1,381	11,633,394	58.2	3.2	49.0	0.2	82.3	0.2	17.7	0.2	5.4	0.1	51.5	0.8
Rural	670	1,442,125	15.1	0.7	50.0	0.3	78.8	0.2	17.4	0.3	4.1	0.1	35.6	1.6

^aRUCC codes are the US Department of Agriculture 2003 Rural–Urban Continuum Codes [1–9] where Metropolitan counties are RUCC 1–3; suburban/small town (excluding rural) counties are RUCC 4–7; and Rural counties are RUCC 8–9

^bPer square mile

^cAverage annual income among households in highest income quintile/average annual income among households in lowest income quintile

^dPer 100,000 population