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      Factor structure, reliability, and item parameters of the brazilian-portuguese version of the GAD-7 questionnaire Translated title: Estructura factorial, confiabilidad, y ítems parámetros de la versión de portugués brasileño del cuestionario GAD-7 Translated title: Estrutura fatorial, fidedignidade e parâmetros de itens da versão em português brasileiro do questionário GAD-7

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          Abstract

          This study examined the psychometric properties of the Brazilian-Portuguese version of the Generalized Anxiety Disorder GAD-7 questionnaire in a community sample (n = 206) of Brazilian adults. The sample was 41% female, with a mean age of 21.10 (SD = 4.49),75.6% from colleges/universities. Results of a confirmatory factor analysis provided support to the original unidimensional model of the GAD-7 in the Brazilian context. Analyses of Variance (ANOVA) showed that the GAD-7 scores were significantly different between males and females, with females scoring higher than males. The scale demonstrated good reliability evidence; both Cronbach's alpha coefficient (α = .916) and rho composite reliability coefficient (ρ= .909) were adequate. Item parameter analysis showed items 5 and 7 presented the highest severity thresholds for the generalized anxiety latent trait, whereas item 1 presented the lowest ones. Our findings suggest that the Brazilian-Portuguese version of the GAD-7 is suitable for assessing Generalized Anxiety Disorder symptoms in Brazilian adults in community settings.

          Translated abstract

          Este estudio examinó las propiedades psicométricas de la versión de portugués brasileño del cuestionario de Desorden de Ansiedad Generalizada GAD-7, en una muestra comunitaria (n = 206) de adultos brasileños. La muestra se compone de 41% de mujeres, con una edad media de 21,10 (SD = 4,49), y 75,6% estudiantes universitarios. El análisis factorial confirmatorio proporcionó evidencias que soportan el modelo unidimensional original del GAD-7 en el contexto brasileño. El análisis de variancia (ANOVA) mostró que las puntuaciones fueron significativamente diferentes entre hombres y mujeres, siendo que las mujeres obtuvieron puntuaciones más altas que los hombres. La escala demostró tener una buena confiabilidad; el coeficiente de alpha de Cronbach (α= .916) y el coeficiente rho de fiabilidad (ρ = .909) fueron adecuados. El análisis de datos mostró los ítems 5 y 7 tuvieron los umbrales de gravedad más altos en el trazo de ansiedad generalizada, mientras el ítem 1 tuvo el más bajo. Nuestros hallazgos sugieren que la versión en portugués brasileño de GAD-7 es adecuado para la evaluación de síntomas de trastorno de ansiedad generalizada en adultos brasileños en contextos comunitarios.

          Translated abstract

          Este estudo analisou as propriedades psicométricas da versão em Português Brasileiro do questionário de "Transtorno de Ansiedade Generalizada - GAD-7 em uma amostra de comunidade (n = 206) da população adulta brasileira. A amostra foi composta por de 41% de participantes do sexo feminino, com idade média de 21,10 (DP = 4,49), e 75,6% em instituições de ensino superior. Os resultados da análise fatorial confirmatória forneceram apoio para o modelo unidimensional original do GAD-7 no contexto brasileiro. As análises de variância (ANOVA) mostraram que os escores do GAD-7 foram significativamente diferentes entre homens e mulheres, com as mulheres apresentando maiores escores que os homens. A escala demonstrou uma boa fidedignidade; sendo que tanto o coeficiente de Cronbach alfa (α = 0,916) e rho coeficiente de confiabilidade composta (ρ = 0,909) foram adequados. A análise dos parâmetros dos itens mostrou itens 5 e 7 apresentaram os limiares mais elevados de severidade para o traço-latente de ansiedade generalizada, enquanto que o item 1 apresentou as menores. Nossos resultados sugerem que a versão Português Brasileiro do GAD-7 é adequada para avaliar os sintomas do transtorno de ansiedade generalizada em adultos brasileiros em ambientes comunitários.

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          A brief measure for assessing generalized anxiety disorder: the GAD-7.

          Generalized anxiety disorder (GAD) is one of the most common mental disorders; however, there is no brief clinical measure for assessing GAD. The objective of this study was to develop a brief self-report scale to identify probable cases of GAD and evaluate its reliability and validity. A criterion-standard study was performed in 15 primary care clinics in the United States from November 2004 through June 2005. Of a total of 2740 adult patients completing a study questionnaire, 965 patients had a telephone interview with a mental health professional within 1 week. For criterion and construct validity, GAD self-report scale diagnoses were compared with independent diagnoses made by mental health professionals; functional status measures; disability days; and health care use. A 7-item anxiety scale (GAD-7) had good reliability, as well as criterion, construct, factorial, and procedural validity. A cut point was identified that optimized sensitivity (89%) and specificity (82%). Increasing scores on the scale were strongly associated with multiple domains of functional impairment (all 6 Medical Outcomes Study Short-Form General Health Survey scales and disability days). Although GAD and depression symptoms frequently co-occurred, factor analysis confirmed them as distinct dimensions. Moreover, GAD and depression symptoms had differing but independent effects on functional impairment and disability. There was good agreement between self-report and interviewer-administered versions of the scale. The GAD-7 is a valid and efficient tool for screening for GAD and assessing its severity in clinical practice and research.
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            Cultural adaptation into Spanish of the generalized anxiety disorder-7 (GAD-7) scale as a screening tool

            Background Generalized anxiety disorder (GAD) is a prevalent mental health condition which is underestimated worldwide. This study carried out the cultural adaptation into Spanish of the 7-item self-administered GAD-7 scale, which is used to identify probable patients with GAD. Methods The adaptation was performed by an expert panel using a conceptual equivalence process, including forward and backward translations in duplicate. Content validity was assessed by interrater agreement. Criteria validity was explored using ROC curve analysis, and sensitivity, specificity, predictive positive value and negative value for different cut-off values were determined. Concurrent validity was also explored using the HAM-A, HADS, and WHO-DAS-II scales. Results The study sample consisted of 212 subjects (106 patients with GAD) with a mean age of 50.38 years (SD = 16.76). Average completion time was 2'30''. No items of the scale were left blank. Floor and ceiling effects were negligible. No patients with GAD had to be assisted to fill in the questionnaire. The scale was shown to be one-dimensional through factor analysis (explained variance = 72%). A cut-off point of 10 showed adequate values of sensitivity (86.8%) and specificity (93.4%), with AUC being statistically significant [AUC = 0.957-0.985); p 0.001). Limitations Elderly people, particularly those very old, may need some help to complete the scale. Conclusion After the cultural adaptation process, a Spanish version of the GAD-7 scale was obtained. The validity of its content and the relevance and adequacy of items in the Spanish cultural context were confirmed.
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              Confirmatory fator analyses for applied Research

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
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                Journal
                tp
                Temas em Psicologia
                Temas psicol.
                Sociedade Brasileira de Psicologia
                1413-389X
                March 2016
                : 24
                : 1
                : 367-376
                Affiliations
                [1 ] University of São Paulo Brazil
                [2 ] Federal University of Rio Grande do Sul Brazil
                [3 ] Federal University of Rio Grande do Sul Brazil
                [4 ] Federal University of Rio Grande do Sul Brazil
                [5 ] Federal University of Rio Grande do Sul Brazil
                [6 ] Federal University of Rio Grande do Sul Brazil
                [7 ] University of São Paulo Brazil
                Article
                S1413-389X2016000100019
                10.9788/TP2016.1-25
                2cfd0165-5f5d-48d6-a114-5611943293e2

                http://creativecommons.org/licenses/by/4.0/

                History
                Categories
                PSYCHOLOGY

                Clinical Psychology & Psychiatry
                GAD-7,Desorden Generalizado de Ansiedad,ansiedad,psicometría,Generalized Anxiety Disorder,anxiety,psychometrics,Transtorno de Ansiedade Generalizada,ansiedade,psicometria

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