This is pretty important stuff, thank you for posting. Often times, 'a problem' exists largely because a person's behaviour and/or performance exists outside o

This is pretty important stuff, thank you for posting. Often times, 'a problem' exists largely because a person's behaviour and/or performance exists outside of the local norm. Given this, then by definition the amount and types of such problems are largely driven by the norm. As you said, I don't have anything at hand to back this up, but this seems like a very reasonable way to explain some of these big diagnosis deltas.