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From the National Health and Medical Research Council Psychiatric Epidemiology Research Centre, Australian National University (Dr. Jorm), Canberra; and Department of General Practice and Public Health, University of Melbourne (Mr. Jolley), Melbourne, Australia.
Address correspondence and reprint requests to Dr. Anthony Jorm, NHMRC Psychiatric Epidemiology Research Centre, Australian National University, Canberra, ACT 0200, Australia.
Objective: To carry out a meta-analysis of the age-specific incidence of all dementias, including AD and vascular dementia.
Background: Several meta-analyses have been carried out on dementia prevalence, but none on its incidence.
Methods: We used loess-curve fitting to analyze data from 23 published studies reporting age-specific incidence data.
Results: The incidence of both dementia and AD rose exponentially up to the age of 90 years, with no sign of leveling off. The incidence rates for vascular dementia varied greatly from study to study, but the trend was also for an exponential rise with age. There was no sex difference in dementia incidence(p = 0.21), but women tended to have a higher incidence of AD in very old age, and men tended to have a higher incidence of vascular dementia at younger ages. East Asian countries had a lower incidence of dementia than Europe (p = 0.0004), and also tended to have a lower incidence of AD.
Conclusions: The incidence of dementia rises exponentially to the age of 90 years. Any sex differences are small, and incidence is lower in East Asia than in Europe.
Received February 2, 1998. Accepted in final form May 1, 1998.
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