Introduction to a Supplement on Population Level Trends in Dementia: Causes, Disparities, and Projections.

The article looks at several studies that aim to broaden the evidence base for understanding dementia trends. Topics covered include caseload and prevalence projections that are crucial to planning appropriate public and private sector responses, estimates of life expectancy and aggregate changes in life expectancy with dementia at ages 65 and 85, and short-term trends in the prevalence and one-year incidence of dementia among the 70 and older population.