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Table 1 Projection method assumptions

From: A commentary on studies presenting projections of the future prevalence of dementia

Extrapolation Cell-based macro-simulation
Constant prevalence over time Constant incidence over time
Constant prevalence between regions Constant incidence between
  regions
Equal mortality risk Constant difference in mortality
  risk
Constant rate of progression Rate of progression stable over
  time
Risk factors stable over time Risk factors stable over time
Risk factors stable between regions Risk factors stable between
  regions