Conversion time from MCI to AD and from normal to MCI Lead Investigator: Lu Tian Institution : Stanford University E-Mail : lutian@stanford.edu Proposal ID : 1042 Proposal Description: The goal of the project to estimate and summarize the age-dependent conversion rate from MCI to AD and from normal to MCI at different centers. The result will provides guidance on the representativeness of NACC cohort at different center and help to extrapolate the distribution of normal, MCI and AD in the future.