Standardized values for parahippocampal gyrus thickness plotted against CETP I405V genotype for APOE ε4 non-carriers (circles; solid line) and carriers (triangles; dashed line). In APOE ε4 non-carriers, the II genotype seems to be protective with respect to parahippocampal thickness. In contrast, in APOE ε4 carriers, VV seems protective. Regression lines computed using the least squares method to best fit the data points. For APOE ε4 non-carriers, R2 = .029. For APOE ε4 carriers, R2 = .007