<<Similarly I wonder how many children actually have ADHD.>>
I wonder the same .. how many actually have ADHD .. and how many are just BORED in school?? Kids can come off their meds in the summer and not be little terrors .. because they are outdoors, using up all of that energy and being the little busy bodies they were meant to be.
It's a terrible thing that we have to drug up little kids to get them to learn their math and reading.