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Assessment
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The Factor Structure and Dimensional Scoring of the Generalized Anxiety Disorder Questionnaire for DSM-IV

Thomas L. Rodebaugh

Washington University in St. Louis, Rodebaugh{at}wustl.edu

Robert M. Holaway

Temple University

Richard G. Heimberg

Temple University

Despite favorable psychometric properties, the Generalized Anxiety Disorder Questionnaire for the Diagnostic and Statistical Manual of Mental Disorders (4th ed.) (GAD-Q-IV) does not have a known factor structure, which calls into question use of its original weighted scoring system (usually referred to as the dimensional score). Analyses appropriate to categorical item responses in a large sample of undergraduates were used to establish the scale's factor structure. Analyses indicated that a one-factor structure resulted in good fit. A scoring method based on this one-factor structure was compared with a variety of alternative scoring procedures, and it was found that a method based on factor scores did relatively well but that the previously suggested dimensional score failed to perform better than a simple sum of items. Results support the general unity of the measure but raise doubts regarding its scoring and response options.

Key Words: Generalized anxiety disorder • worry • psychometrics • categorical data

This version was published on September 1, 2008

Assessment, Vol. 15, No. 3, 343-350 (2008)
DOI: 10.1177/1073191107312547
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