Preliminary Reliability and Validity of the Generalized Anxiety Disorder Questionnaire - IV: A Revised Self-Report Diagnostic Measure of Generalized Anxiety Disorder
Newman, M. G., Zuellig, A. R., Kachin, K. E., Constantino, M. J., Przeworski, A., Erickson, T. M., & Cashman-McGrath, L. (2002). Preliminary reliability and validity of the Generalized Anxiety Disorder Questionnaire-IV. Behavior Therapy, 33(2), 215-233. doi:10.1016/S0005-7894(02)80026-0
19 Pages Posted: 28 Jan 2015 Last revised: 8 May 2019
Date Written: 2002
This study examined the Generalized Anxiety Disorder Questionnaire-IV (GAD-Q-IV), a revised self-report diagnostic measure of generalized anxiety disorder (GAD) based on the 4th edition of the Diagnostic and Statistical Manual. Subjects were undergraduates (aged 17-41 yrs). GAD-Q-IV diagnoses were compared to structured interview diagnoses of individuals with GAD, social phobia, panic disorder, and nonanxious controls. Using Receiver Operating Characteristics analyses, the GAD-Q-IV showed 89% specificity and 83% sensitivity. The GAD-Q-IV also demonstrated test-retest reliability, convergent and discriminant validity, and kappa agreement of .67 with a structured interview. Students diagnosed with GAD by the GAD-Q-IV were not significantly different on 2 measures than a GAD community sample, but both groups had significantly higher scores than students identified as not meeting criteria for GAD, demonstrating clinical validity of the GAD-Q-IV.
Keywords: Generalized Anxiety Disorder Questionnaire IV; reliability; validity; generalized anxiety disorder; self diagnosis; college students
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