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. (c) 2005 John Wiley & Sons, Ltd.
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. (c) 2005 John Wiley & Sons, Ltd.
Authors: Robert Fieo; Shubhabrata Mukherjee; Natalia O Dmitrieva; Denise C Fyffe; Alden L Gross; Elizabeth R Sanders; Heather R Romero; Guy G Potter; Jennifer J Manly; Dan M Mungas; Laura E Gibbons Journal: Int J Geriatr Psychiatry Date: 2014-12-05 Impact factor: 3.485
Authors: Thomas Forkmann; Maren Boecker; Markus Wirtz; Heide Glaesmer; Elmar Brähler; Christine Norra; Siegfried Gauggel Journal: Health Qual Life Outcomes Date: 2010-09-21 Impact factor: 3.186