(CBC News) — One in three cases of dementia could be prevented by tackling risk factors such as education and depression, a large new international review estimates.

A team of 24 experts in dementia conducted the review on prevention and care.

In Thursday’s issue of The Lancet and at this year’s Alzheimer’s Association International Conference in London, researchers model how nine health and lifestyle factors contribute to about 35 per cent of dementia.

For instance, they said that if everyone reaped the brain stimulation and interaction of staying in school until over the age of 15, the total number of dementia cases could be reduced.