Thursday, January 24, 2019

Data: Compared to highly intelligent American women, mentally disabled women have twice the number of kids

Now that we've established that US women differ a great deal in the number of children they have, let's look a current dysgenic trends.  This graph shows the mean number of offspring for all women ages 40-55 listed by IQ level (N = 921):

The pattern is no surprise, but it still stings me to see it. Women with IQs of 62.6 average 2.75 kids, while the mean for the highest IQ category (126.3) is 1.44 offspring.

Women below the line for mental disability have families almost twice as large as our most intelligent women.  This dysgenic trend has persisted for some time, and it means that each generation has a little less genetic potential for intelligence.  Not good.

UPDATE:  Once in a while, people ask me what I like to do in my free time. My answer is, "to document the decline of the United States of America."


  1. Most of the cohort studies I have seen suggest that the most intelligent ('gifted') women in the US average only about 0.5 children - and this goes back to Terman's California study of a century ago; before the contraceptive pill etc.

    The only antidote to the dysgenic pattern is some religions - eg traditionalist Christians who do not use contraception (Amish, Hutterites), Orthodox/ Ultra-Orthodox Jews, Devout Muslims -- and Mormons, who do use contraception but (at least until about 15 years ago, I haven't seen more recent data) have modestly above-replacement average fertility and also show increasing fertility with education and wealth

    My interpretation is that religion is 'biologically' necessary for human beings - and when it is absent or downgraded to triviality, then they become psychopathologically deranged, mentally ill and suppress their own reproduction - like wild animals placed in alien forms of captivity.

    Only those that lack the intelligence or self-discipline to use contraception will then have above above-replacement fertility; but as you show that intelligence threshold for replacment fertility is very low: far too low to sustain modern society.

    And then - on top - there is mutation accumulation...

  2. My neighbor is devout Mormon. She has an MS in Biology and has eight kids!

    1. I'd like to see her whole genotype, and that of the man/men she chose to sire her brood.

  3. Hmmm..I wonder what the pattern is for men?


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