Actually, less than 17% autistics have an IQ that is below average.
Henny Kupferstein
21

This study took another look at the IQ issue and found that intellectual disability (IQ <70) occurred in 55% in ASD including under 20% with moderate to severe ID (IQ <50)— as opposed to the older work that found ~ 75%. 25% had average IQ, < 3% had above average.

http://centaur.reading.ac.uk/17903/1/IQ_%28in_press%29_Psychological_Medicine.pdf

I’m not sure how useful or relevant this is, considering the tendency for wide discrepancies between the verbal and non-verbal components which can result in no “meaningful” IQ (to indicate expected functioning) being calculable. I know of someone with a 50 point difference- above average in verbal, borderline intellectual disability in performance. An outlier maybe, or a misdiagnosis (had meningitis when young)?

The study did look at adaptive behaviour which is perhaps a better indication of how ASD shows up when ‘getting by in the world as it is’.

“ Overall adaptive outcome was significantly lower than IQ and the discrepancy was most notable in the high IQ subgroup, where adaptive behaviour scores lagged by 35 points behind IQ.”

One clap, two clap, three clap, forty?

By clapping more or less, you can signal to us which stories really stand out.