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Prevalence and incidence of dementia in the oldest old: A longitudinal study of a population-based sample of 84–90-year-olds in sweden

✍ Scribed by Dr. Boo Johansson; Steven H. Zarit

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
786 KB
Volume
10
Category
Article
ISSN
0885-6230

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✦ Synopsis

Prevalence and incidence rates of dementia, and the relationship between these rates and mortality, were explored in a longitudinal population-based study of individuals aged 8 4 9 0 at baseline living in the municipality of Jonkoping, Sweden. The subjects were reexamined twice at 2-year intervals using DSM-111-R criteria for dementia. The prevalence rateofdementiaat time 1 through3 was: 31%(N=97/312),40%(N= 82/206)and42%(N= 52/123),respectively, which reflects a 4-years overall increase of age in the sample. The 2-year incidence was 19.8Y0 from the first to the second wave and 14.9% in the interval between the second and third wave. Of the non-demented at baseline, 22% ( N = 481218) had developed dementia within 4 years. A twofold increased mortality risk was found in demented subjects. The present investigation confirms a high prevalence and incidence of dementia in the oldest old. The substantially increased risk of mortality in demented old olds, however, counterbalances the high incidence rates, keeping prevalence lower than otherwise would be the case.

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