Geographic Clusters of Alzheimer's Disease Mortality Rates in the USA: 2008-2012.

Importance: The results identified geographic clusters of high and low Alzheimer's disease (AD)-related mortality across the contiguous United States. These clusters identify specific geographic groupings of counties that allow researchers to narrow the focus to identify some of the biopsychosocial variables contributing to increased or decreased AD mortality.

Objectives: To determine the extent to which geographic clusters exist where AD mortality significantly differs from the national average.