MAPT and Alzheimer disease: The YOAD group showed protein biomarker levels consistent with AD (Aβ42 = 356.0 ± 159.1 pg/ml; total tau = 744.5 ± 375.0 pg/ml; phospho-tau = 101.7 ± 37.9 pg/ml; ATI = 0.37 ± 0.22).