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Diagnostic Performance of the Geriatric Depression Scale and the Beck Depression Inventory with Nursing Home Residents

Published online by Cambridge University Press:  29 November 2010

Réjeanne Laprise
Affiliation:
Laval University
Jean Vézina
Affiliation:
Laval University

Abstract

This study compared the diagnostic performance of the Beck Depression Inventory (BDI) and the Geriatric Depression Scale (GDS) in correctly identifying depressed and nondepressed older people who are nursing home residents without cognitive disorders. At the usual cut-off scores of 10 and 11, sensitivity was 96.30 per cent for the BDI and 88.89 per cent for the GDS, while their specificity rates were 46.15 and 56.41 per cent respectively. Using Receiver Operating Characteristics (ROC) curves, the results obtained using these scales were compared with the diagnosis of psychiatric disorder according to the DSM-III-R. Contrary to the hypothesis, no difference was found between the area under the ROC for the BDI (Az = .87; SD = .04) and for the GDS (Az = .85; SD = .05). The exclusion of the somatic items, or the somatic factor, did not change the diagnostic performance of the BDI. Indices of temporal stability, concurrent validity and agreement with clinical diagnoses also confirmed the reliability and validity of these two scales for older people living in nursing homes.

Résumé

Cette étude avait comme objectif de comparer les performances diagnostiques de l'Inventaire de Dépression de Beck (IDB) et de l'Échelle de Dépression Gériatrique (EDG) à correctement identifier des adultes âgés déprimés et des adultes âgés non déprimés exempts de troubles cognitifs importants et vivant en centres d'accueil. Aux seuils-critères usuels de 10 et de 11, la sensibilité du IDB était de 96,30 pour cent et celle du EDG de 88,89 pour cent alors que la spécificité se situait à 46,15 et 56,41 pour cent respectivement. Les courbes caractéristiques du receveur (ROC) ont permis de confronter les résultats obtenus à ces échelles avec le diagnostic des psychiatres selon les critères du DSM-III-R. Contrairement à ce qui avait été prévu, aucune différence n'a été retrouvée entre la surface sous la courbe du IDB (Az = 0,87; é.t. = .04) et celle du EDG (Az = 0,85; é.t. = .05). Ce résultat indique l'équivalence des performances diagnostiques de ces deux échelles. L'exclusion des énoncés somatiques ou du facteur somatique n'a pas amélioré significativement la performance diagnostique du IDB. Des indices de stabilité temporelle, de validité concomitante et de concordance avec le diagnostic ont aussi confirmé la fidélité et la validité de ces deux échelles auprès de résidants cognitivement intacts vivant en centres d'accueil.

Type
Articles
Copyright
Copyright © Canadian Association on Gerontology 1998

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