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Use of the Quick Dementia Rating System (QDRS) as an Initial Screening Measure in a Longitudinal Cohort at Risk for Alzheimer's Disease


Berman SE, Koscik RL, Clark LR, Mueller KD, Bluder L, Galvin JE, Johnson SC.

JAD Rep. 2017;1(1):9-13. Epub 2017 Apr 28.

Abstract

The Quick Dementia Rating System (QDRS) and Clinical Dementia Rating Scale (CDR) assess global cognitive and functional decline. We evaluated whether the shorter QDRS was a valid screen for problems identified by the CDR in individuals with minimal clinical abnormalities. Agreement between QDRS-Global and CDR-Global was assessed for 54 participants from the Wisconsin Registry for Alzheimer's Prevention. Resource-savings achieved by adopting an "administer CDR-only-if-QDRS-Global>0" approach were estimated based on 238 subsequent participants. Agreement statistics (concordance = 88.9%) supported use of the QDRS as an initial informant report and modifying center protocol to administer CDRs only when QDRS>0 reduced CDR assessments by 79.8%.

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