Given that neither the CSF-based nor the PET-based model was specifically designed for classifying CN-Stables vs. CN-Converters/MCI-stables vs. MCI-converters, and that both models used basic and noninvasive data (demographics, APOE4, cognitive, and MRI), the CSF-based model performed exceptionally well for the MCI/dementia conversion prediction in CN and MCI groups, while the PET-based model performed well only in the MCI group. Here, APOE is linked to dementia.