The AD-PS subgroup also had a lower rate of amnestic MCI (p < 0.02), a lower proportion of patients with the APOE- ε4 genotype (p < 0.05, data limited to 42 of 52 patients), and lower IADL scores (p < 0.02), but they had higher NPI scores (p < 0.02). This evidence concerns the gene APOE and Alzheimer disease.