Population genealogy resource shows evidence of familial clustering for Alzheimer disease.

Objective: To show the potential of a resource consisting of a genealogy of the US record linked to National Veterans Health Administration (VHA) patient data for investigation of the genetic contribution to health-related phenotypes, we present an analysis of familial clustering of VHA patients diagnosed with Alzheimer disease (AD).

Methods: Patients with AD were identified by the code. The Genealogical Index of Familiality method was used to compare the average relatedness of VHA patients with AD with expected relatedness.