It's been a while since I read up on the subject for personal reasons, but wasn't one of the problems with ADHD for a long time that getting accurate numbers wa

It's been a while since I read up on the subject for personal reasons, but wasn't one of the problems with ADHD for a long time that getting accurate numbers was hard because of frequent misdiagnosis (actually just diagnosing a depression instead). Especially, because the symptoms were still considered debatable at that time? So maybe, diagnosis shifted dramatically during that time as well?