Tracy-Widom tests and associated P-values (in parenthesis) for the significance of principal components.

Note: The tests are based on the principal components analyses with 12,898 population structure inference SNPs. aPLCOca-PLCOco is the original PLCO prostate cancer study. bPLCOca-NHSco is the reconstructed study with prostate cancer cases from the PLCO, and external controls from NHS. cNHSca-NHSco is the original NHS breast cancer study. dNHSca-PLCOco is the reconstructed study with breast cancer cases from the NHS, and external controls from PLCO.