Purpose: The aims of this study were to describe the nature and diversity of perceived
cognitive deficits using the Perceived Deficits Questionnaire (PDQ), to assess the reliability
of the PDQ, and to explore self-reported predictors of PDQ scores in a large community-
based sample of persons with multiple sclerosis (MS). Materials and Methods: Persons with
MS enrolled in a randomized controlled trial provided demographic data and completed the
PDQ along with measures of cognitive and memory strategies, cognitive abilities, self …