Figure 1. Quantile-Quantile plots for 483,399 single SNP tests of association.
Plots depict expected versus observed −log10 P-values for 483,399 single SNP tests of association (in 931 LOAD cases and 1,104 cognitive controls, with adjustment for principal components as covariates for population substructure). Plot A includes the most-strongly associated SNPs within the APOE locus, whereas plot B excludes the three most-strongly associated SNPs for clarity.