http://goo.gl/SAS0CS
The study, published this week in Nature Communication, confirmed that dementia rates have been falling—by an average of around 20% over a 20-year period. But the average masks are a more interesting trend: the reduction was predominantly observed in men.
In the 1990s, for every 1,000 men aged 70-74, 12.9 developed dementia within a year. Twenty years later, that figure dropped to 8.7. The reduction was even more dramatic for men aged 65-69, as the relative number of new dementia cases more than halved over the same period.
For women, the reduction in the dementia rate was far more modest. Women aged 65-69 saw dementia cases drop from 6.3 per 1,000 women to 4.6 over 20 years. Meanwhile, the incidence rate went up slightly for women aged 80-84: from 35.6 per 1,000 during the 1990s to 39.6 in the later cohort.