No one seemed to have ADD when I was at lower school. I'm sure some did have it, but for the most part if we misbehaved at school our parents were informed, thereafter we got a hiding.
My cousin shows all the signs of having it, even though doctors don't believe he does. His parents have never disciplined him in the manner that I'm used to which seems strange because I firmly believe if he'd been smacked on the ass a few times when he was younger, he wouldn't be the way he is now.
Infact, iirc, ADD/ADHD never became a big thing untill smacking children became a socially unnaceptable thing to do, at which point every kid suddenly seemed to have it.