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NEUROLOGY 1995;45:741-747
© 1995 American Academy of Neurology

Prevalence of age-associated memory impairment in a randomly selected population from eastern Finland

K. Koivisto, MD, K. J. Reinikainen, MD, T. Hanninen, MA, M. Vanhanen, MA, E-L. Helkala, PhD, L. Mykkanen, MD, M. Laakso, MD, K. Pyorala, MD and P. J. Riekkinen, Sr., MD

Article abstract-Aging has multiple effects on memory in normal subjects. However, information on the prevalence of age-associated memory impairment (AAMI) is scanty. We studied the prevalence of AAMI in a randomly selected population of 1,049 subjects aged 60 to 78 years from eastern Finland. Research criteria proposed by the National Institute of Mental Health (NIMH) Work Group were applied. We calculated prevalence rates for AAMI by the inclusion criteria alone (subjective and objective memory impairment and no dementia) as well as by the inclusion and exclusion criteria (evidence of any neurologic or other medical disorder that could produce cognitive deterioration) for the total study population, for both sexes, and for four age groups (60 to 64, 65 to 69, 70 to 74, and 75 to 78 years). Subjective memory impairment was present in 76.3% of the subjects. Prevalence rates for objective memory impairment ranged from 31.9 to 78.4% in individual tests. A total of 564 subjects (239 men, 325 women) were classified as having AAMI by the inclusion criteria alone, giving a prevalence rate of 53.8% (men, 57.4%; women, 51.3%). When we included the exclusion criteria, the prevalence of AAMI decreased to 38.4% (men, 42.5%; women, 35.7%). By both methods, age- and sex-specific prevalence rates were highest in the youngest group, aged 60 to 64 years, and lowest in the oldest group, aged 75 to 78 years. We conclude that the prevalence of AAMI, by the diagnostic criteria of the NIMH Work Group, is high in the elderly Finnish population. AAMI seems likely to be a phenomenon of normal aging rather than a continuum from normal aging to a pathologic state such as Alzheimer's disease.

NEUROLOGY 1995;45: 741-747




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