OLS Regressions and Heckman Two-Stage Regression Models of AFB on Polygenic Score (Using All SNPs)
Source: Authors' calculations from LifeLines Cohort Study, TwinsUK, and STR.
Note: First stage selection models based on NEB polygenic scores (all SNPs). AFB = age at first birth; NEB = number of children ever born, SNPs = single nucleotide polymorphisms; OLS = ordinary least-squares regression; WF = within-family. Standard errors in parentheses. *p < .05; **p < .01; ***p < .001