APOE and diabetes mellitus: There was no statistically significant interaction between type 2 diabetes and APOE ε4 carriership: B-coefficient for diabetes –38.03 (95% CI, –55.93 to –20.12; p<0.001), for APOE ε4 carriership, 0.22 (95% CI, –1.27 to 1.71; p = 0.77), and for type 2 diabetes x APOE ε4 carriership, 4.12 (95% CI, –1.69 to 9.92; p = 0.17).