A recent study shows that between 2002 and 2013, age- and sex-standardized stroke and dementia incidence rates in the Ontario population decreased by 32.4% and 7.4%, respectively.
This is the first study showing a decline in dementia incidence over time.
This report may also be unique in showing a corresponding decline in stroke incidence in the same population. Previous evidence suggests that diet, exercise, cognitive training, and vascular risk monitoring may improve or maintain cognitive functioning in at-risk elderly people. Hence, primary prevention strategies resulting in improved risk-factor control may have concurrently reduced dementia risk.5 In addition, given that cerebrovascular disease is an important cause of dementia and that 60 to 80% of all major dementias have a vascular component, the falling incidence of stroke may have further contributed to the decline in dementia incidence.