In the univariate analysis, there were significant statistical differences between the two groups in terms of age of onset (P = 0.021 <0.05), facial nerve angle size (P < 0.01), hypertension (P = 0.01 <0.05), presence of APOE ε4 expression (P < 0.01), and different degrees of brainstem compression in the REZ (P < 0.01). Here, APOE is linked to hypertensive disorder.