Fig. 2.

Graphic illustration (left) and tabular listing of p-values (right) of regional FDG ratios for an average 40-year-old APOE ε4 carrier and noncarrier, and 85-year-old APOE ε4 carrier and noncarrier, where the FDG ratio values were derived from regression analyses. On the right are the p-values for the main effects of age and APOE ε4 carriage, and the p-value for the interaction term. The actual ratio values are given in the Appendix Table 1. “+” signs indicate APOE ε4 carriers and “o” signs indicate APOE ε4 noncarriers. Blue symbols indicate the 85-year-olds and gold symbols the 40-year=olds. Abbreviations: APOE, apolipoprotein E; FDG, ¹⁸F-fluorodeoxyglucose.