The Geriatric Depression Scale should be shortened: results of Rasch analysis.

Abstract:

BACKGROUND:The purpose of this study was to examine the unidimensionality, item fit, redundancy and differential item functioning (DIF) of the 15-item version of the Geriatric Depression Scale (GDS) in a community sample of 300 Hong Kong Chinese patients with pneumoconiosis. METHODS:Participants were randomly selected from the case register of the Pneumoconiosis Compensation Fund Board of Hong Kong. A trained research assistant administered the GDS to all participants. A psychiatrist, who was blind to the GDS scores, conducted a structured clinical interview to diagnose depressive disorders according to the Diagnostic and Statistical Manual for Mental Disorders, Version IV (DSM-IV) criteria. RESULTS:Of the 300 participants, 37 (12.3%) had a DSM-IV diagnosis of depressive disorders. Eleven out of 15 items (73.3%) had INFIT/OUTFIT statistics between 0.7-1.3. Abbreviated versions were created by removal of misfit and redundant items resulting in similar overall performance as the original 15-item GDS. None of the items had significant DIF for age, level of education and cognitive impairment. CONCLUSIONS:Although the GDS was overall unidimensional, there was evidence of item redundancy indicating that a shortened version would be as adequate as the original version.

authors

Tang WK,Wong E,Chiu HF,Lum CM,Ungvari GS

doi

10.1002/gps.1360

subject

Has Abstract

pub_date

2005-08-01 00:00:00

pages

783-9

issue

8

eissn

0885-6230

issn

1099-1166

journal_volume

20

pub_type

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