A-78: Updated Normative Data and Cognitive Indices for Use in Parkinson's Disease and Older Adults
Objective: The Parkinson’s Progression Markers Initiative cognitive battery (PPMI-CB) is used to understand cognitive sequelae in Parkinson’s disease (PD). Despite its prominence, analytical approaches and application of norms is psychometrically lacking. Our aim is to apply robust norming (i.e., omitting those with...