Map Details – High Blood Pressure (HBP) Medication Non-Adherence and Pharmacies, by ZIP Code Tabulation Area (ZCTA/ZCTA Group), 2015–2017 Idaho Medicaid Patients

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Impact Statement

The map indicates variable but elevated rates of non-adherence within the state’s population centers (as indicated by clustering of pharmacy locations), with higher rates frequently seen in adjoining rural areas. This map suggests that abundant opportunities to improve non-adherence rates also exist outside of the state’s metro areas.

This map displays ZIP Code tabulation area (ZCTA)–level high blood pressure medication non-adherence rates among Medicaid patients in the state of Idaho, 2015–2017. The map indicates variable but elevated rates of non-adherence within the state’s population centers (as indicated by clustering of pharmacy locations), with higher rates frequently seen in adjoining rural areas. For comparison to inset maps, the map displays county boundaries as well. Three inset maps provide context of how Idaho’s population is dispersed. One inset map displays overall population by county, indicating the highest population in the Southwest part of the state. The other two inset maps display percentages of each county’s overall Medicaid population and Medicaid population with HBP, respectively. The counties with higher percentages of Medicaid populations largely correspond to the areas of highest medication non-adherence shown in the main map.
Key Points

Major Findings

Estimates of health behaviors and/or conditions in rural areas of Idaho are frequently suppressed due to either statistical unreliability or potential for breaches in confidentiality. This map overcomes these issues by (1) aggregating over time and (2) aggregating over space in rural areas of the state to create rural ZCTA groups. The map indicates variable but elevated rates of non-adherence within the state’s population centers (as indicated by clustering of pharmacy locations), with higher rates frequently seen in adjoining rural areas. Improving access to effective services within Idaho population centers can positively impact overall Medicaid non-adherence rates. However, this map suggests that abundant opportunities to improve non-adherence rates also exist outside of the state’s metro areas.

How the map will be used, or has been used

These maps provide base-level understanding of access to blood pressure medication in relation to medication non-adherence rates. As a result of these maps, the Idaho Division of Public Health Heart Disease and Stroke Prevention Program plans to work with the Idaho State University College of Pharmacy to conduct statewide assessment of pharmacy services with the state.