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In which case there's still the issue that it seems to correlate with said deficiencies.
I think it's more because of restriction-of-range effects (people who have both low IQ and said deficiencies are likely to be in their parents' basements so we don't usually see them, and people who have both are likely to be in places like DC so we don't usually see them either) than because they actually correlate in the whole population.