Secondary Mann-Whitney analyses examining differences within SCD and MCI individuals showed that within SCD, Aβ/P-tau+ individuals were older (W = 2852.5, p < 0.01), more likely to be APOE ε4 carriers (W = 2345.0, p < 0.001), and had lower education levels (W = 4576.5, p = 0.015). The gene discussed is APOE; the disease is Schnyder corneal dystrophy.