Unadjusted diabetes prevalence rates for all adult Medicaid recipients (base map) and race specific rates (rings). The base map in the center of the figure shows unadjusted diabetes prevalence rates for all South Carolina adult Medicaid recipients at the county level. The 46 spokes surrounding the base map represent each of the state's 46 counties. Extending outward from the central base map, each spoke consists of a leader line connecting a specific county on the base map with its county label, a square polygon showing county-level unadjusted diabetes prevalence among White adult Medicaid recipients, and a square polygon showing county-level unadjusted diabetes prevalence among African American adult Medicaid recipients. The set of 46 polygons showing diabetes prevalence among Whites forms the innermost ring of the ring map, while the 46 polygons showing diabetes prevalence among African Americans form the outermost ring of the map. The prevalence rates shown in the legend encompass the entire range of rates for all adult Medicaid recipients, African American adult Medicaid recipients, and White adult Medicaid recipients. Shadow effects underneath some county labels and square polygons serve to highlight those counties in the highest quartile of the county-level unadjusted diabetes prevalence rate distribution for all adult Medicaid recipients.
Stewart et al. International Journal of Health Geographics 2011 10:18 doi:10.1186/1476-072X-10-18