Since disorders were self-reported, I wonder if capacity or willingness to understand complex disorders was controlled. For instance, a low intelligence person

Since disorders were self-reported, I wonder if capacity or willingness to understand complex disorders was controlled. For instance, a low intelligence person might consider autism to be "bad" and avoid considering it, or unable to afford doctors to tell him. While a high intelligence person would recognize that the autistic spectrum has advantages and disadvantages, and would be more likely to accept it.