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NEUROLOGY 1989;39:773
© 1989 American Academy of Neurology

Prevalence of medically diagnosed dementia in a defined United States population

Rochester, Minnesota, January 1, 1975

Emre Kokmen, MD, C. Mary Beard, RN, MPH, Kenneth P. Offord, MS and L. T. Kurland, MD

Departments of Neurology and Health Sciences Research, Mayo Clinic and Mayo Foundation, Rochester, MN (Dr. Kokmen)
Section of Clinical Epidemiology, Mayo Clinic and Mayo Foundation, Rochester, MN (Ms. Beard, Mr. Offord, and Dr. Kurland).

Using the centralized diagnostic data resource for the population of Rochester, Minnesota, we determined the prevalence of medically diagnosed dementia for this community. There were 289 individuals with dementia who were residing in Rochester on January 1, 1975:208 women and 81 men. The overall age-and sex-adjusted rates per 100,000 population were 342 for all dementias and 227 for Alzheimer's disease. Prevalence rates increased with age for both sexes. Limiting the denominator to persons ≥,65 years, age-adjusted rates per 100,000 population for men and women were 3,452 and 3,466 (or about 3.5%), respectively, for dementia and 2,007 and 2,675 (2.0 and 2.7%), respectively, for Alzheimer's disease.

Address correspondence and reprint requests to Dr. Kokmen, Department of Neurology, Mayo Clinic, Rochester, MN 55905.

Supported in part by NIGMS grant AG06786 and NIH grant AR30582, National Institutes of Health, Public Health Service.

Received August 23, 1988. Accepted for publication in final form December 29, 1988.




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