The "slightest deviation" hypothesis has been conclusively disproven. ADHD positive by American standards correlates with -10 IQ points, double the rate of serious injuries, much lower age of first pregnancy and much higher rates of promiscuity, dramatically lower rates of high school (secondary school) graduation, almost total inability to complete a university degree, amd very high rates of criminal conviction (at least half of prisoners are ADHD positive).

The American ADHD criteria are hard science, derived by looking at a syndrome of social failure and back-calculating diagnostic criteria.

The European approach, in contrast, is based on Freudian dogma. I.e., weapons grade malarkey.