Cognitive ability and fertility in Swedes

aka a select population of white people.

We examine the relationship between cognitive ability and childbearing patterns in contemporary Sweden using administrative register data. The topic has a long history in the social sciences and has been the topic of a large number of studies, many reporting a negative gradient between intelligence and fertility. We link fertility histories to military conscription tests with intelligence scores for all Swedish men born 1951–1967. We find a positive relationship between intelligence scores and fertility, and this pattern is consistent across the cohorts we study. The relationship is most pronounced for the transition to a first child, and men with the lowest categories of IQ scores have the fewest children. Using fixed effects models, we additionally control for all factors that are shared by siblings, and after such adjustments, we find a stronger positive relationship between IQ and fertility.

Furthermore, we find a positive gradient within groups at different levels of education. Compositional differences of this kind are therefore not responsible for the positive gradient we observe—instead, the relationship is even stronger after controlling for both educational careers and parental background factors. In our models where we compare brothers to one another, we find that, relative to men with IQ 100, the group with the lowest category of cognitive ability have 0.56 fewer children, and men with the highest category have 0.09 more children.

There are a lot of new readers who don’t seem to know how I roll.

  1. I am right.
  2. When in doubt, see rule one.

My assumptions have statistical backing. Read up or FO.

Oh, look, it’s the military! [coughs in K-type]

My brain doesn’t instantly become thick because you dislike an opinion it produces.

If you’re not smart enough to know what’s science, what’s speculative and what’s satire, go elsewhere.

I’ve spent years proving myself on here, with a variety of good predictions (the refugee crisis, African demographics, Brexit, Trump etc). Your incredulity is not required.

1. Be civil. 2. Be logical or fair. 3. Do not bore me.

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