Nothing is presently known about the relationship between individual differences in fertility and life history (LH) speed, as measured by the K-Factor. To examine this relationship, the correlation between LH speed and the number of children was examined in two, large samples (MIDUS II and the Swedish STAGE dataset). Their association was positive and statistically significant in both cross-national samples. The association was robust with respect to statistically controlling for participant age. Nested model comparison of a Model looking only at linear effects with a second Model incorporating a quadratic term did not improve model fit in any instance, suggesting directional selection for slower LH. The heritability of the indicators comprising the K-Factor positively
moderated the strength of selection, while K-Factor loading weakly negatively moderated selection strength, suggesting that K-Factor variance, as a multivariate latent construct, is not the primary target of selection. These results are consistent with fertility intentions data indicating positive correlations between slower LH and desired numbers of children.
Ref.
Woodley of Menie, M.A., Cabeza de Baca, T., Fernandes, H.B.F., Madison, G., Figueredo, A.J. (2017). Slow and steady wins the race: K positively predicts fertility in the USA and Sweden. Evolutionary Psychological Science, 3, 109-117.
https://link.springer.com/article/10.1007%2Fs40806-016-0077-1
Take the Mini-K (download the paper, and go to p. 269): https://www.researchgate.net/publication/222419459_Consilience_and_Life_History_Theory_From_genes_to_brain_to_reproductive_strategy
Or, take the full Arizona K battery (warning - 199 items!): https://arizona.app.box.com/s/1prthk79i0zersjeqylgbrwwyfprju4y
Patreon: https://www.patreon.com/mawoodleyofmenie
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