National estimates of the prevalence of XXXX in the United States.

@entity303 @entity66 @entity283 @entity195
Several methods of estimating prevalence of @entity303 are presented in this article. For both Brookmeyer and the @entity283 ( @entity283 ), the estimates of prevalence are derived statistically, forward calculating from incidence and survival figures. The choice of incidence rates on which to build the estimates may be critical. Brookmeyer used incidence rates from several published studies, whereas the @entity283 investigators applied the incidence rates observed in their own cohort. The Aging, Demographics, and Memory Study (ADAMS) and the East Boston Senior Health Project (EBSHP) were sample surveys designed to ascertain the prevalence of @entity195 and @entity303 . ADAMS obtained direct estimates by relying on probability sampling nationwide. EBSHP relied on projection of localized prevalence estimates to the national population. The sampling techniques of ADAMS and EBSHP were rather similar, whereas their disease definitions were not. By contrast, EBSPH and @entity283 have similar disease definitions internally, but use different calculation techniques, and yet arrive at similar prevalence estimates, which are considerably greater than those obtained by either Brookmeyer or ADAMS. @entity66 may play the larger role in explaining differences in observed prevalence between these studies.
