This dissertation examines the effectiveness of cognitive-behavioral group therapy (CBGT; Heimberg, 1991) in an outpatient metropolitan private practice. Twenty-four adult clients diagnosed with social phobia were treated. Outcome measures included: the Beck Depression Inventory (BDI; Beck, Ward, Mendelson, Mock, & Erbaugh, 1961), Social Phobia Anxiety Inventory (SPAI; Turner, Beidel, Dancu, & Stanley, 1989), Fear of Negative Evaluation (FNE; Watson & Friend, 1969), brief version of the Fear of Negative Evaluation(BFNE; Leary, 1983), Social Anxiety Interaction Scale (SIAS; Mattick & Clarke, 1998), Social Phobia Scale (SPS; Mattick & Clarke, 1998), State-Trait Anxiety Inventory (STAI; Spielberger, Gorsuch, & Lushene, 1970), Fear Questionnaire (FQ; Marks & Mathews, 1979), and Social Avoidance and Discomfort (SAD; Watson & Friend, 1969). Results from t-tests, Reliable Change Indices (The "c" Index; Jacobson & Truax, 1991), and effect sizes were evaluated. Statistically significance demonstrated on the BFNE, SPS, Total FQ, SIAS, Social Phobia subscale on the FQ, STAI, Trouble subscale on the FQ, and Distress subscale on the FQ. The effect sizes (d) were .87, 1.04, .71, .79, 1.72, .82, .74, and 1.08, respectively. Six of the 21, five of the 16, 10 of 16 and eight of 16 participants who completed the BDI, BFNE, SPS and SIAS, respectively, experienced a reliable change. The "c" Index of the BDI, Agoraphobia portion of the FQ, BFNE, SPS, SIAS, and Total FQ demonstrated a clinically significant change for 10 of 21, 13 of 16, seven of 16, seven of 16, five of 16, and 11 of 16 participants, respectively. CBGT appears to be effective in an outpatient, private practice, metropolitan setting with individuals who have a diagnosis of social phobia.
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