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PurpleAlien47 t1_irfhjd3 wrote

Reply to comment by Gemmabeta in TIL A 2017 study found that the introduction of iodized salt in 1924 raised the IQ for the one-quarter of the population most deficient in iodine. by kstinfo

Not sure, and unfortunately the paper Business Insider is citing doesn't seems to go into detail about how they're mapping these AGCT scores onto IQ. That information is probably in one of the paper's own references.

They do however mention they weren't able to find a significant correlation between AGCT scores and level of education in this particular dataset:

>While surprising, this finding is consistent with the fact that in our data we find a very weak correlation between AGCT scores and education. Specifically, the correlation between AGCT scores and graduation from high school is 14%, while the correlation between AGCT scores and having one year of college or more is just 9%.

https://www.nber.org/system/files/working_papers/w19233/w19233.pdf

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Gemmabeta t1_irfhx22 wrote

I mean, the difference here is they are comparing people with considerable schooling with people who has even more schooling (high school dropouts vs college students).

I am talking about people who are entirely unschooled or nearly so (of which there were many back in the World War I era).

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