[IFC_LLC]

You are stating exactly the problem.

A well written scientific book would never leave a reader in a state of “maybe”.

Also, if the numbers go down to 0.2% I can’t help but notice that this can’t be defined as a disorder. It is a statistical error.

There is a placebo effect. Furthermore any doctor knows the rule of self-diagnosis. “Any patient, given a chance, will self-diagnose anything”.

With no data on how the data about illness was obtained I can’t say if this is a statistical error or a fluke.

Also, as noted above, should there be a method of testing for such a condition that is objective, I would live with 2% or 0.2%. (For example, 0.001% of people are missing this and this chromosome, and we know that because we can do a DNA test.) But there is no way of saying something like this just cause you did a survey and ask people some vague questions about their mental state. There are people who would just fake answers in their responses for fun. And just cause of that I don’t trust numbers like 2% in this specific case.