Factor analysis
To explore the dimensionality of the ADCS-ADL-MCI, both exploratory and confirmatory factor models were run. However, the models generally did not converge which is likely due to the low variance at baseline. In addition, the gating response format adds further complexity to running such models. Therefore, as results from the factor analyses were inconclusive, these are not reported in the results section.SAS version 9.4 (SAS Institute Inc, Cary, NC) was used for all statistical analyses detailed above. In all of the analyses, 