Will treating the whole population with the polypill reduce the incidence of all-cause dementia? #PreventiveNeurology The falling incidence of dementia in England and Wales may be explained by cardiovascular risk modification and supports our ambition to test the polypill at a population level to reduce all-cause dementia. A falling incidence does not sort out the issue for the society and the government because the prevalence of dementia (number of people alive and living with dementia) is still increasing. There is also a very good podcast from the BMJ on the finding's. Ahmadi-Abhari et al. Temporal trend in dementia incidence since 2002 and projections for prevalence in England and Wales to 2040: modelling study . BMJ 2017;358:j2856 Objective : To forecast dementia prevalence with a dynamic modelling approach that integrates calendar trends in dementia incidence with those for mortality and cardiovascular disease. Design Modelling study : Setting General adult ...