APOB and coronary artery disorder: In an alternative approach to determining the gradient of CHD risk per unit difference in genetically predicted Lp(a)-apoB and LDL-apoB, we examined the relationship of apoB to incident CHD risk by ventile of ‘Lp(a)’ PGS (Figure 3, Panel B), and by ventile of ‘LDL’ PGS (Panel A).