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The Collateral Source version of the Geriatric Depression Scale: evaluation of psychometric properties and discrepancy between collateral sources and patients with dementia in reporting depression

Published online by Cambridge University Press:  14 February 2011

Yu-Ping Chang ,
Dorothy Farrar Edwards  and
Helen W. Lach
Yu-Ping Chang*
Affiliation:
School of Nursing, The State University of New York, Buffalo, NY, USA
Dorothy Farrar Edwards
Affiliation:
Department of Kinesiology, University of Wisconsin-Madison, Madison, WI, USA
Helen W. Lach
Affiliation:
School of Nursing, Saint Louis University, Caroline, St. Louis, MO, USA
*
Correspondence should be addressed to: Yu-Ping Chang, Wende Hall 3435 Main Street, Buffalo, NY14214, USA. Phone: +1 (716) 829-2015, Fax: +1 (716) 829-2021. Email: [email protected].
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Abstract

Background: Depression is under-diagnosed and under-treated in older adults. The purposes of this study were to (a) evaluate the psychometric properties of the Collateral Source Geriatric Depression Scale (CS-GDS), (b) compare collateral source scores on the CS-GDS with patient scores on the GDS, and (c) examine factors associated with any discrepancies between the CS-GDS and the GDS.

Methods: This secondary analysis used data from 132 older adults and their collateral sources attending a geriatric assessment program over a 15-month period. Scores on the 30-, 15-, and 5-item CS-GDS were compared to clinician diagnoses of depression using DSM-IV-TR criteria and patient GDS scores.

Results: The three forms of the CS-GDS had acceptable internal consistency, sensitivity and specificity with recommended cut-off scores of 18, 9 and 3, respectively. Collateral sources reported more depressive symptoms than patients did themselves. Simple regression analysis showed that caregiver burden significantly influenced the discrepancy between CS-GDS scores and GDS scores (β = 0.147; p = 0.004). Functional limitations and collateral relations to the patient were not associated with these discrepancies.

Conclusion: All three collateral versions had acceptable psychometric properties, which supports the use of the CS-GDS to assess depression in older adults. The CS-GDS provides an important alternative for depression screening with older adults who cannot complete screening tools themselves; however, alternative cut-off scores must be used for high sensitivity and specificity.

Keywords

depressionreliabilityvalidityCollateral Source Geriatric Depression Scaledementia
Type
Research Article
Information
International Psychogeriatrics , Volume 23 , Issue 6 , August 2011 , pp. 961 - 968
Copyright
Copyright © International Psychogeriatric Association 2011

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