How frequently does PLS occur? The incidence of PLS is rare, but the exact number is uncertain. ALS affects two individuals per 100,000 each year, and tentative estimates put the annual PLS incidence rate at half a per cent of that number. The median duration of PLS is approximately 20 years, while the duration of ALS is two to five years, so PLS More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.