GBA carriers had worse performance across most cognitive measures, and potential sex-specific differences on specific cognitive tasks were noted in relation to APOE and GBA. Importantly, when all variables were included in the model, we found that although performance on specific cognitive tests best predicted subsequent cognitive status in the cohort for PD-NCI and PDD, this model could not accurately predict future PD-MCI. Here, APOE is linked to Parkinson disease.