Greater precision when measuring dementia severity: establishing item parameters for the Clinical Dementia Rating Scale.
Greater precision when measuring dementia severity: establishing item parameters for the Clinical Dementia Rating Scale.
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DOI:
10.1159/000341731
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发表时间:
2012
影响因子:
2.4
通讯作者:
Doody RS
中科院分区:
文献类型:
--
作者:
Lowe DA;Balsis S;Miller TM;Benge JF;Doody RS
An item response theory (IRT)-based scoring approach to the Clinical Dementia Rating (CDR) scale can account for the pattern of scores across the CDR items (domains) and the items’ differential abilities to indicate dementia severity. In doing so, an IRT-based approach can provide greater precision than other CDR scoring algorithms. However, neither a good set of item parameters nor an easily digestible set of instructions needed to implement this approach is readily available. Participants were 1,326 patients at the Baylor College of Medicine Alzheimer’s Disease and Memory Disorders Clinic. The item parameters necessary for an IRT-based scoring approach were identified (a parameters ranged from 3.01 to 6.22; b parameters ranged from −2.46 to 2.07). This study provides and demonstrates how to easily apply IRT-based item parameters for the CDR.
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