A pair of economists at the Ragnar Frisch Center for Economic Research in Norway has found that men who score higher on IQ tests tend to put off having children longer than men who score lower—and yet they still mange to have more children than their lower-scoring associates. In their study, reported in the journal Biology Letters, Bernt Bratsberg and Ole Rogeberg analyzed population data for males in Norway living between the years 1950 to 1981.
Male fertility patterns by cognitive ability , birth cohort, and age. The difference between weighted and unweighted average birth cohort IQ scores, with weights given by cohort fertility. In panels and , the vertical dashed line separates cohorts with fully observed fertility from those with imputed fertility at high ages. The bars are 95% credibility intervals. The expected lifetime fertility rate by CA score group for men in three cohorts, along with 95% credibility intervals.
In their study, the researchers included more than 900,000 Norwegian males, all of whom had undergone military conscription IQ tests as teenagers. They found that men scoring in the top 20% on the IQ tests waited on average until they were 27 years old before having their first child—and they had on average 1.8 offspring. They note that it is likely that IQ plays an indirect role in childbearing for men in Norway.
They point out, for example, that men who score well on their IQ test tend to be more likely to go to college, which can lead to delayed parenting, as can beginning a career at a later age, after college, than men who do not attend college.
Prior research has shown that couples having children later in life can be problematic on a socioeconomic scale—sperm count and delivery issues become more of an issue as a man ages, as does a man's ability to physically care for a child. Also, children born to men age 45 and up have a much higher risk of fathering children withMore information:
Bernt Bratsberg et al, Stability and change in male fertility patterns by cognitive ability across 32 birth cohorts,
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