Some cohort studies have reported a decline in dementia prevalence and incidence over time, although these findings have not been consistent across studies. We reviewed evidence on changes in dementia prevalence and incidence over time using published population-based cohort studies that had used consistent methods with each wave and aimed to quantify associated changes in risk factors over time using population attributable fractions (PAFs).

https://2medical.news/2024/07/19/changes-in-prevalence-and-incidence-of-dementia-and-risk-factors-for-dementia-an-analysis-from-cohort-studies/