Indeed. The problem is we don't know. The survey doesn't ask what area they use it, how often or rarely, or whether they used it "instead of" or "as well as".
Different people may have different guesses how to interpret it. But we don't know.
FT2
The only thing we can do is try to make the information as good as possible and appropriately word and display our disclaimer about not relying inappropriately on Wikipedia.
We can leave it up to professionals to sort out ambiguous information from ambiguous sources such as patients and Wikipedia.
Fred