High dose statins prevent dementia

Data from 57,669 older Taiwanese patients (65+) with no dementia at the beginning of the 5-year study has found that the risk of developing dementia was inversely related to statin dosage. Those on the highest doses of statins were three times less likely to develop dementia. The potency of the statins was also a factor, with high potency statins such as atorvastatin and rosuvastatin giving the most benefit.

Nearly 10% developed dementia during the study.

http://www.eurekalert.org/pub_releases/2013-08/esoc-hds083013.php

Reference: 

“Statin use and the incidence of dementia in the elderly: a nation-wide data survey” was presented at the European Society of Cardiology 2013 Congress in Amsterdam.