Validation of an Ambulatory Capacity Measure in Parkinson Disease: A Construct Derived from the Unified Parkinson’s Disease Rating Scale

摘要

BackgroundA construct calculated as the sum of items 13, 14, 15, 29, 30 of the Unified Parkinson’s Disease Rating Scale (UPDRS) has been used as an “Ambulatory Capacity Measure” (ACM in Parkinson disease (PD). Its construct validity has never been examined. A similar construct, consisting of the mean value of the same UPDRS items has been used under the acronym PIGD as a measure of postural instability and gait disorder in PD.