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To evaluate the external validity of comorbid patterns of anxiety disorders among youth who presented to an anxiety disorders clinic, comorbid cases were compared to "pure" anxiety disorder cases. Children and adolescents (N=329; mean age=10.04 years) and parents were administered structured interviews and four groups were formed, Pure Anxiety, Anxiety+Anxiety, Anxiety+Externalizing, and Anxiety+Depressive, and compared along with four external validation criteria: sociodemographics, clinical phenomenology, psychosocial, and family factors. All comorbid groups were more severe than the pure anxiety group on clinical phenomenology and psychosocial factors. The Anxiety+Depressive Disorders group was most severe on all criteria except sociodemographics. Results provide evidence for the external validity of comorbid diagnostic presentations among anxiety disorders, as there was differential meaningfulness in the diagnostic presentation of a pure anxiety disorder versus anxiety disorder comorbid with other disorders. Assessment and future research implications are discussed.

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Objective This study uses data from the largest effectiveness trial to date on treatment of co-occurring posttraumatic stress and substance use disorders, using advances in statistical methodology for modeling treatment attendance and membership turnover in rolling groups. Method Women receiving outpatient substance abuse treatment (N = 353) were randomized to 12 sessions of Seeking Safety or a health education control condition. Assessments were completed at baseline and at 1 week, 3, 6, and 12 months posttreatment. Outcome measures were alcohol and cocaine use in the prior 30 days captured using the Addiction Severity Index. Latent class pattern mixture modeling (LCPMM) was used to estimate attendance patterns and to test for treatment effects within and across latent attendance patterns and group membership turnover. Results Across LCPMM analyses for alcohol and cocaine use, similar treatment attendance patterns emerged: Completers never decreased below an 80% probability of attendance, droppers never exceeded a 41% probability of attendance, and titrators demonstrated a 50% to 80% probability of attendance. Among completers, there were significant decreases in alcohol use from baseline to 1-week posttreatment, followed by nonsignificant increases in alcohol during follow-up. No differences between treatment conditions were detected. Titrators in Seeking Safety had lower rates of alcohol use from 1-week through 12-month follow-up compared with control participants. Droppers had nonsignificant increases in alcohol during both study phases. Cocaine use findings were similar but did not reach significance levels. Conclusions The impact of client self-modulation of treatment dosage and group membership composition may influence behavioral treatment outcomes among this population.

Consistent with past research, the study's findings provide further evidence that the short-term benefits of exposure-based CBT for childhood phobic and anxiety disorders using both group and individual treatment may extend into the critical transition years of young adulthood.