filtering (MAF < 5%), 6,108,668 SNPs were included in the GWAS. Of the 602 participants with Aβ PET data, 559 individuals were included in the resulting genetic data set. Among these individuals, four pairs exhibited significant relatedness (PLINK identity by descent PI_HAT > 0.5) and therefore one individual from each pair was randomly selected for exclusion (2 HC, 1 EMCI, 1 LMCI), leaving 555 participants for the final GWAS sample.
