Earlier quoted context omitted.
> I'm a dyslexic, and I was given extra attention is school that significantly helped me. And I suspect that is probably true for most "dyslexics". I have a pet suspicion that there is an actual dyslexia but that most diagnoses are simply a manifestation of 2 standard deviations of "everybody's brain is wired slightly differently and some things require more effort." One of my relatives is really good at mathematical…
And only 3 standard deviations is actually a disability?
If we look at height, that's a 6'7"/5'1" male or a 6'1"/4'8" female.
At those numbers, the probability that there is a medical issue--malnourishment/endocrine problems/Marfan's syndrome, etc.--starts being non-trivial.