APOE and dementia: The multivariable logistic regression analysis, treating diagnosis as the dependent factor and APOE ε4 classification as the independent, revealed that individuals without APOE ε4 had a reduced likelihood of developing MCI (OR = 0.745, 95% confidence interval: 0.587–0.945, p = 0.015) and dementia (OR = 0.422, 95% confidence interval: 0.259–0.688, p = 0.001).