Today we know that 10% of the population is dyslexic. So those 3 children should've actually been 80. Some of those 77 children could be in the group of adults who can't read.
What is interesting to me is that you rarely see people rant about the dyslexic the way you see people talking about something like ADHD.
It's the sort of thing that doesn't have a fixed name, because once it's had a name for ~10 years everyone decides the term is offensive and gives it a new name.
Anyway. It used to be that dyslexic children didn't go very far in the education system, and today they do. In part because they can get extra time during tests. I imagine there are similar stories for ADHD and whatever else you have these days.