Hayden--
I can understand why you feel
hesitant about considering it a "spectrum;" nevertheless,
it is quite likely (I don't know the exact details,
so I can't be sure) that _some_ sort of spectrum is
implied.
In any case, a survey/quiz like this does _not_
result in a diagnosis. But it can be a useful screening
tool, in much the same way as the Body Mass Index. [I'm
not going to delve into the theory behind them;
suffice it to say that they catch a lot of positives,
even if they have a lot of false
negatives.]
--STI