2.2.1 EA and CP
The variable genetic information for EA represented by “years of
education” were extracted from the BOLT-LMM (a mixed-model association
method) summary association statistics released by Loh, P. R. et
al.[12], which were available on the GWAS catalogue website
(https://www.ebi.ac.uk/gwas/).
The GWAS summary dataset for CP was extracted from Social Science
Genetic Association Consortium (SSAGC) Data Portal
(http://thessgac.com). We extracted single-nucleotide
polymorphisms(SNPs) for CP from a meta-analysis combined a published
study of general cognitive ability (n=35,298) conducted by the Cognitive
Genomics Consortium with new GWAS of cognitive performance in the UKB (n
=222,543)[13].