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. Author manuscript; available in PMC: 2020 Aug 20.
Published in final edited form as: Intelligence. 2019 May 7;75:48–58. doi: 10.1016/j.intell.2019.01.011

Table 3:

Genetic correlations and genetic causality proportions.

Traits rg ± SE GCP ± SE
Intracranial volume
 IQ 0.291 ± 0.107 0.746 ± 0.146
 EduYears 0.411 ± 0.077 0.721 ± 0.174
ICV + HC
 IQ 0.306 ± 0.083 0.495 ± 0.137
 EduYears 0.353 ± 0.064 0.450 ± 0.136

rg, the genetic correlation estimated by bivariate LD Score regression between the measures of head size (Taal et al., 2012; Hibar et al., 2015) and cognition (Lee et al., 2018); GCP, the genetic causality proportion, which ranges between zero (genetic variation acts purely as a confounder X ← G → Y ) and one (joint genetic influences act purely through the causal chain G → X → Y ); ICV + HC, GWAS meta-analysis of adult intracranial volume and infant head circumference.