20–33% PwP have mild cognitive impairment (MCI) at time of diagnosis, but 83 percent of those still living with the disease after 20 years have dementia. | Parkinson’s Dementia: Stages, Behavior, Symptoms, and More

Dementia is a condition that causes a decline in thinking, reasoning, and problem-solving.  About 20–33% PwP have  mild cognitive impairment...