By further binning admixed individuals into deciles of global European ancestry and determining the variance explained of the total liability (genetics and environment) by the PRS, we estimated a 1.34% increase in accuracy for each 10% increase in global European ancestry, replicating a previous analysis of height in the UK Biobank.8 The slope of this linear relationship increased with increasing heritability but was not found to vary with the number of true causal variants (Figure S3).
