MORENO, André Luiz et al. Factor structure, reliability, and item parameters of the brazilian-portuguese version of the GAD-7 questionnaire. []. , 24, 1, pp.367-376. ISSN 1413-389X.  https://doi.org/10.9788/TP2016.1-25.

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.

: GAD-7; Generalized Anxiety Disorder; anxiety; psychometrics.

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