The Social Phobia Diagnostic Questionnaire: Preliminary Validation of a New Self-Report Diagnostic Measure of Social Phobia
Newman, Michelle G., Kachin, Kevin E., Zuellig, Andrea R., Constantino, Michael J., & Cashman-McGrath, Laurie. (2003). The Social Phobia Diagnostic Questionnaire: Preliminary validation of a new self-report diagnostic measure of social phobia. Psychological Medicine, 33(4), 623-635. doi:10.1017/S003
13 Pages Posted: 28 Jan 2015 Last revised: 8 May 2019
Date Written: 2003
The development and validation of the Social Phobia Diagnostic Questionnaire (SPDQ), a new self-report diagnostic instrument for social phobia, is described in 3 studies. In Study 1, the participants were 125 undergraduates seeking help for an anxiety disorder of whom 60 had social phobia. Receiver operating characteristics (ROC) analysis was conducted comparing SPDQ diagnoses and clinician-based Anxiety Disorder Interview Schedule-IV (ADIS-IV) diagnoses of social phobia. Diagnoses made by the SPDQ showed an 85% specificity, an 82% sensitivity and kappa agreement with the ADIS-IV of 0.66. In Study 2, 462 undergraduates completed the SPDQ and a battery of additional questionnaires. The SPDQ had good internal consistency, good split-half reliability, and strong convergent and discriminant validity. In Study 3, 145 undergraduates completed the SPDQ at two time points separated by 2 weeks as well as several additional questionnaires. Scores on the SAD, FNE and SISST of SPDQ categorized undergraduates were also compared to scores on these measures from 35 clinical community participants to determine the clinical validity of the SPDQ. The SPDQ had strong 2-week test-retest reliability and good convergent and discriminant validity and demonstrated clinical validity.
Keywords: Social Phobia Diagnostic Questionnaire: psychometrics; self report; test validity; clinical and convergent and discriminant validity; internal consistency; sensitivity and specificity
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