MAPT and Alzheimer disease: The concentration (mean with SD) of Tau (47.49±9.00 ng/μL, 95% CI 44.58–50.71) in AD patients was significantly (p<0.00001) higher than that of MCI patients (39.26±7.78 ng/μL, 95% CI 36.67–41.86) and elderly control (34.92±6.58 ng/μL, 95% CI 32.73–37.13).