APOE and Alzheimer disease: Further analysis showed that the odor identification score had a weak correlation with Aβ42 levels in CSF and with the Aβ42/40 ratio, after adjusting for age, sex, ApoE4 status, and performance in the MMSE test in the normal biomarker and selected AD continuum group (Spearman’s rho = 0.230, P = 0.043 and rho = 0.292, P = 0.010, respectively; Table 5A).