Baseline variables.

*p**p***pAQT = A Quick Test of Cognitive Speed; MCI-AD = MCI patients who progress to AD; MCI-Other dementias = MCI patients who progress to other dementias than AD; MMSE (O & R) = the orientation and delayed word recall parts of the MMSE; SD = standard deviation.MMSE, MMSE (O&R), Clock drawing, Aβ42 and Aβ42/Tau: A lower value is pathological.AQT, Tau and P-tau: A higher value is pathological.There were significant differences among the groups for all variables (Kruskal-Wallis).