Quote:
Originally Posted by johnt
The link states:
"Researchers from the Central Hospital of Rogaland in Stavanger, Norway, found that nearly 80% of the Parkinson’s patients they studied over an eight-year period developed dementia. ... Where does the 80% come from?
I make it (51 + 43 + 28)/224 = 54.5%
John
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Good question, John. This is actually a fairly old study (2003) and the article didn't give full detail. There were 55 deaths and 10 drop-outs. So, they used a baseline sample of 159, not 224.
Gary