Figure 3
Age-adjusted diabetes prevalence among adult African American Medicaid recipients (base map) and environmental characteristics (rings). For the ordered category variables–diabetes prevalence rate, unemployment, rurality, fast food restaurant availability, and convenience store availability–"Low" equals the bottom quartile, "Medium" equals the second and third quartiles combined, and "High" equals the top quartile of the respective data distributions. Shadow effects underneath some county labels and square polygons serve to highlight those counties in the highest quartile of the county-level age-adjusted diabetes prevalence rate distribution for African American adult Medicaid recipients.