Several methods of estimating prevalence of dementia are presented in this study. For both
Brookmeyer and the Chicago Health and Aging project (CHAP), the estimates of prevalence
are derived statistically, forward calculating from incidence and survival figures. In this study,
the choice of incidence rates on which to build the estimates may be critical. Brookmeyer
used incidence rates from several published studies, whereas the CHAP investigators
applied the incidence rates observed in their own cohort. The Aging, Demographics, and …