In the Cox proportional hazards model that included APOE in the MCI, AD, and DLB groups, being an APOE ɛ4 carrier compared with APOE ɛ4 non-carrier was not associated with death (adjusted hazard ratios and 95% confidence intervals for MCI: 0.66, 0.39–1.12; AD: 0.82, 0.65–1.03; and DLB: 1.53, 0.88–2.66, respectively (Table 6). Here, APOE is linked to Alzheimer disease.