Psychometric Properties of the Portuguese Version of the Geriatric Anxiety Inventory in a Sample of Eldery People in Residential Care
Revista Portuguesa de Investigação Comportamental e Social, 1(2), 15-30. DOI: 10.7342/ismt.rpics.2015.1.2.22
15 Pages Posted: 15 Jul 2017
Date Written: September 30, 2015
Background: The progressive increase in the prevalence of anxiety disorders in advanced ages advises the extensive use of screening inventories in this population that, everywhere in the world, has become increasingly numerically significant. Goals: The aim of this study is to present the results of validation and reliability studies of the Portuguese version of Geriatric Anxiety Inventory (GAI). Methods: After, translation and back-translation of GAI, the Portuguese version was administered to 805 institutionalized elderly. The reliability of the scale was assessed by Cronbach's alpha coefficient and factorial validity using the extraction method of Principal Components Analysis. The convergent validity study was conducted with the Geriatric Depression Scale and the Negative Affects Schedule while discriminant validity was performed with the Positive Affects Schedule and the Satisfaction With Life Scale. We used confirmatory factor analysis, by means of structural equation modeling, to test the fit of the model with 20 items. We used the area under the ROC curve (AUC) to predict the group of elderly patients with generalized anxiety disorder and the group of healthy elderly. Results: The scale has good internal consistency (α = 0.94), indicators of good convergent and discriminant validity, were all significant. The model showed a good quality of fit to the data (χ2/df = 2.805; TLI = 0.959; CFI = 0.964; RMSEA = 0.047). The ROC analysis revealed a sensitivity of 100% and specificity of 84.7% in the detection of generalized anxiety disorder with a cutoff score of 13 (AUC = 0.92). Finally, women showed higher scores than men. Conclusions: The GAI has good psychometric and factorial qualities to measure anxiety symptoms in epidemiological surveys and in geriatric institutionalized settings.
Keywords: Geriatric Anxiety Inventory, old age, validation
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