County-level estimates of diagnosed diabetes among adults aged 20 years and older were determined using the CDC’s Behavioral Risk Factor Surveillance System (BRFSS) and the U.S. Census Bureau’s Population Estimates Program. Diagnosed diabetes was defined as a “Yes” response to the BRFSS survey question, “Has a doctor ever told you that you have diabetes?”. Women who indicated they had diabetes only in pregnancy were excluded from the analysis.
Three years of data (2014-2016) were used in order to improve precision of year-specific and county-level estimates. Age adjustments were calculated based on the U.S. population in 2000 using the following age groups: 20-44, 45-64, and 65 or older. These analyses were performed by the CDC and made publicly available on the Interactive Atlas of Heart Disease and Stroke, a website developed by the CDC Division for Heart Disease and Stroke Prevention. Data were retrieved from the website on May 23, 2019. (https://nccd.cdc.gov/dhdspatlas/)
Data for the locations of Diabetes Prevention Programs (DPPs) were retrieved from the National Center for Chronic Disease Prevention and Health Promotion, Division of Diabetes Translation, with assistance from the Children’s Environmental Health Initiative (CEHI) at Rice University. Data were downloaded on May 3, 2019. DPP sites that were only virtual were not included in the map. (https://nccd.cdc.gov/DDT_DPRP/Programs.aspx)