Study finds Parkinson's-dementia link
Researchers followed the cases of 233 Parkinson's patients over a 12-year period to determine the rate of dementia among them. They found that, during that time, a full 60% - 140 patients in all – developed some form of dementia.
Furthermore, they found that life expectancy was significantly reduced among those with Parkinson's who had dementia by the time they were 70, compared with those who developed it as a septuagenarian. Women tended to live a few years longer then men. The study appears in the journal Neurology.