It is the estimate we have based on the evidence available. It's possible it is off, but that is conjecture

No the numbers are admittedly conjecture are the people that do the studies admit countries like North Korea are done by region averages because there is no data given by the NK government.

So you dispute IQ averages of North Korea, but readily accept the numbers associated with autism? Which I don't see the relevance of anyway.

You mean there’s a difference between falsifiable data and non-falsifiable data?

Variance and predictability are not at all incongruous with each other. The predictability of genetics as it relates to intelligence is so strong on average that, if you had similarity consistent predictability in sports betting, you would quickly amass a fortune.

As long as environmental factors are maintained, the second malnutrition hits, iqs drop dramatically like in the pubmed study I posted…