A description of the study design, procedures and main outcome findings have been reported elsewhere (Hofmann et al., in press ). The sample consisted of 169 adults diagnosed with generalized SAD as determined by the Structured Clinical Interview for DSM–IV Diagnosis (SCID-I) (First, Spitzer, Gibbon, & Williams, 2001 ) and a score 60 or higher on the Liebowitz Social Anxiety Scale (LSAS; Liebowitz, 1987 ) at intake. Exclusion criteria were: 1) clinically significant medical disorders; 2) lifetime history of obsessive-compulsive disorder, bipolar disorder, schizophrenia, psychosis, or delusional disorders; 3) diagnosis of PTSD, substance abuse or dependence, or eating disorder within the past 6 months; 4) organic brain syndrome, mental retardation, or other cognitive dysfunction; 5) clinically significant suicidal ideation or behavior within the past 6 months; 6) concurrent psychotropic medication; 7) concurrent psychotherapy; 8) prior non-response to exposure therapy; and 9) women who were pregnant, lactating, or of childbearing potential who were not using medically accepted forms of contraception. Figure 1 depicts the participant flow.