[anexprogrammer]

It's a big subject and I don't want to to drag too far off topic. So I'll just say prescription rates in 1990 were when the condition was barely recognised and hugely under-diagnosed. Most doctors still believed you grew out of it.

Research seeems to indicate a global prevalence of around 5-10%, settling around 7.8%. So those areas, and there are some, diagnosing >10% are overdoing it. Until we have blood or genetic tests it's too reliant on self-reporting. Even so, many still struggle to get diagnosed or are suspected of just seeking recreational amphetamines.

If it does turn out to be 7%, that's over 22.5m in the US, 4.5m in the UK. It's doubtful all would need or want prescription as not everyone is affected similarly.

I wouldn't have hesitated to push for diganosis if I'd recognised it in my own children (It's strongly determined by heredity).