I still have a copy of the checklist. And made at least 200 copies of it. I posted it online. I handed it out at supermarkets, I handed it out at church, I gave it to doctors and dentists, I handed it out to my neighbors.
And absolutely 100% of everyone who did the checklist tested positive for add/adh/. This was in 1993/1994. Before the morph to "autism spectrum".