title: Transdiagnostic assessment of anxiety symptoms using the Anxiety Disorder Diagnostic Questionnaire - weekly version.
abstract: BACKGROUND
  Norton and Robinson [2010. Development and evaluation of the anxiety disorder diagnostic questionnaire. Cognitive Behaviour Therapy, 39(2), 137-149. doi: 10.1080/16506070903140430 ] developed the Anxiety Disorder Diagnostic Questionnaire (ADDQ) as a transdiagnostic assessment of fear and anxiety to address problems in using diagnosis-specific measures as well as limitations with the extant transdiagnostic measures of anxiety. The present study validated a weekly version of the ADDQ, the Anxiety Disorder Diagnostic Questionnaire - Weekly (ADDQ-W) allowing session-by-session transdiagnostic assessment of anxiety.
  
  
  METHODS
  Data were a secondary analysis of 49 treatment-seeking outpatient adults from a previous clinical trial. The ADDQ-W was administered weekly over the course of 12-group therapy sessions.
  
  
  RESULTS
  The ADDQ-W was a valid weekly measure and neither scores, F(2, 37) = 2.70, p = .08, nor trajectories of change, F(2, 37) = 0.31, p = .73, differed by primary diagnosis, though power was limited. Rate of ADDQ-W change was predictive of change in both primary diagnosis severity, t = 2.40, p = .02, β = 0.32, and overall severity, t = 3.01, p < .01, β = 0.36, at post-treatment.
  
  
  CONCLUSIONS
  This study has established initial support for the use of the brief, easily scored, ADDQ-W for repeated assessment over treatment using a diagnostically heterogeneous clinical sample of treatment-seeking individuals.
authors.affiliation: a Michael E. DeBakey Veterans Affairs Medical Center , Houston , TX , USA.
authors.forename: Angela H
authors.initials: AH
authors.lastname: Smith
authors.affiliation: b Department of Psychology , University of Houston , Houston , TX , USA.
authors.forename: Daniel J
authors.initials: DJ
authors.lastname: Paulus
authors.affiliation: c Department of Psychology , Monash University , Melbourne , Australia.
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Norton
mesh_terms: D000328:Adult; D001008:Anxiety Disorders / Q000175:diagnosis* / Q000523:psychology; D005260:Female; D006801:Humans; D008297:Male; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires / Q000592:standards*
keywords: Anxiety; assessment; measurement; transdiagnostic