While I'm normally very gung-ho in favor of diagnosis, and fairly pro-meds to a lesser extent, I think something's wrong if 11% of kids are being diagnosed. And a whopping 1 in 5 highschool-aged males?!
I noticed this statistic comes from a survey of parents. Is it possible some of the parents said their kid was diagnosed with ADHD based on comments by their teachers (or whatever) rather than because their child was actually diagnosed by a qualified professional?
On the other hand, there are things that exacerbate ADHD symptoms (even sometimes causing them in people who wouldn't otherwise have them), and I think everyone these days has more problems with those....
AND I feel like society is getting increasingly ADHD-unfriendly. It's not enough to just not have ADHD any more. You need to be on the total opposite end of the spectrum. Even many adults without ADHD want to take Adderal so they can get by in life. Like all mental illnesses, ADHD diagnosis is based on impairment. Everybody loses things occasional, arrives late occasionally, or daydreams.... You're only diagnosed with ADHD if those are frequent life-crippling problems. In a culture wherein stepping through the door frame literally two seconds after a bell goes off will have negative ramifications for you for the next couple days (or longer) even though you were early 99 times out of 100, I guess it makes sense that the threshold for "impairment" is pretty low.