Silver Book Fact
In 2002, about 26% of older community-living adults with severe disabilities (cannot perform 3 or more daily activities) were cognitively impaired.
Alzheimer's Association. 2007 Alzheimer’s Disease Facts and Figures. Washington, D.C.: Alzheimer’s Association; 2008. http://www.alz.org/national/documents/Report_2007FactsAndFigures.pdf