It's hard to estimate an exact number of people affected by dysarthria because the condition has so many causes and may have a range of severity. If you have a brain or nerve disorders, or are older and in poor health, you have an increased risk for developing dysarthria. For example, about 1 percent of the population older than 60 suffers from Parkinson's, and about 89 percent of those with Parkinson's develop a speech or voice disorder as the disease progresses. Dyasarthria is also a common effect of traumatic brain injury and stroke.
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