Table 3.

Model-based small area estimation summary statistics (%) and BRFSS direct estimates for up-to-date mammography use and rarely or never had a mammogram by NCHS metropolitan and nonmetropolitan county population size

NCHS categorya	No of counties	Mean	95% CI	Min	Lower quartile	Median	Upper quartile	Max	Inter-quartile range	Overall Range	BRFSSb
											mean	95% CI
Up-to-date
1 (overall)		79.47	78.36–80.52								80.94	79.89–81.94
Counties	68	79.72		71.69	78.26	80.20	81.35	87.23	3.08	15.54
2 (overall)		79.67	79.00–80.33								78.92	77.98–79.82
Counties	368	78.55		67.57	76.43	79.02	81.08	88.7	4.65	21.16
3 (overall)		78.02	77.39–78.67								78.53	77.65–79.39
Counties	372	77.32		61.02	75.59	77.91	80.09	87.02	4.50	26.00
4 (overall)		77.41	76.81–78.07								77.65	76.36–78.88
Counties	358	77.00		66.13	75.08	77.43	79.73	86.73	4.64	20.59
5 (overall)		76.02	75.49–76.52								75.95	74.82–77.04
Counties	641	75.39		61.36	72.30	75.86	78.49	86.53	6.20	25.17
6 (overall)		75.64	75.14–76.11								72.61	71.34–73.83
Counties	1335	74.90		56.60	71.67	75.68	78.27	86.77	6.61	30.17
Rarely or never
1 (overall)		10.58	9.99–11.18								8.88	8.20–9.62
Counties	68	10.60		6.77	9.86	10.47	11.20	15.04	1.34	8.27
2 (overall)		10.29	9.94–10.67								10.40	9.75–11.08
Counties	368	11.03		5.66	9.98	10.86	12.13	17.33	2.15	11.67
3 (overall)		11.50	11.13–11.87								11.13	10.50–11.80
Counties	372	11.96		6.26	10.70	11.47	12.98	20.16	2.28	13.90
4 (overall)		11.95	11.62–12.34								12.26	11.22–13.34
Counties	358	12.22		6.41	10.94	11.97	13.32	18.38	2.38	11.96
5 (overall)		12.74	12.44–13.04								13.42	12.57–14.33
Counties	641	13.09		7.07	11.58	12.78	14.47	21.58	2.88	14.51
6 (overall)		13.01	12.71–13.29								15.36	14.38–16.39
Counties	1335	13.39		6.66	11.76	13.09	14.78	22.72	3.02	16.06

Notes:

^aMetropolitan and nonmetropolitan areas were based on the 2013 6 categories of NCHS urban-rural classification Scheme for counties (12).

^1.Large central Metropolitan Statistical Areas (MSA) with population ≥1 million.

^2.Large fringe MSA with population ≥1 million.

^3.Medium metropolitan counties within MSAs of 250,000–999,999 population.

^4.Small metropolitan counties within MSAs of 50,000–249,999 population (small metro).

^5.Micropolitan counties with a city of 10,000 or more population).

^6.Non-core (non-micropolitan) counties without a city of 10,000 or more population

Up-to-date = having had the most recent mammogram within 2 years; Rarely or never = having had the most recent mammogram ≥5 years before the survey interview or never.

The total number of counties in these areas is 3142 after deleting 5 counties to reflect the number of counties in the 2014 BRFSS survey.

^bBRFSS percentages are weighted to the study population