title: Admixture analysis of the diagnostic subtypes of social anxiety disorder: implications for the DSM-V.
abstract: OBJECTIVE
  Much controversy exists regarding diagnostic subtypes of social anxiety disorder (SAD). The present study used admixture analysis to examine whether individuals with generalized and nongeneralized SAD belong to the same or different populations of origin. This can inform diagnostic subtyping of SAD in the forthcoming DSM-V.
  
  
  METHODS
  Treatment-seeking individuals with generalized SAD (n = 154) and nongeneralized SAD (n = 48) completed a battery of questionnaires. Based on participants' responses to the Liebowitz Social Anxiety Scale (LSAS), we estimated log likelihood and chi-square goodness-of-fit for models with 1, 2, 3, or 4 populations of origin, and compared models using forward stepwise estimation and maximum likelihood ratio tests.
  
  
  RESULTS
  Admixture analyses suggested that the two diagnostic subtypes of SAD belong to the same underlying population of origin. In addition, observable differences in depression, general anxiety, and comorbidity were no longer significant when controlling for social anxiety severity.
  
  
  CONCLUSIONS
  Our sample was recruited in the U.S. and was a treatment-seeking sample. Future studies should examine whether our results generalize to different cultures, and community samples.
  
  
  CONCLUSIONS
  Support for qualitative differences between SAD subtypes was not found. Rather, our findings support the notion that the diagnostic subtypes of SAD differ quantitatively, and that SAD exists on a continuum of severity. This finding informs diagnostic subtyping of SAD in the forthcoming DSM-V.
authors: Department of Psychology, Boston University, 648 Beacon St., 6th floor, Boston, MA, USA. iaderka@bu.edu
authors: Idan M
authors: IM
authors: Aderka
authors: Angela
authors: A
authors: Nickerson
authors: Stefan G
authors: SG
authors: Hofmann
mesh_terms: D000328:Adult; D001008:Anxiety Disorders / Q000145:classification* / Q000175:diagnosis* / Q000453:epidemiology; D016009:Chi-Square Distribution; D015897:Comorbidity; D003710:Demography; D039721:Diagnostic and Statistical Manual of Mental Disorders; D005239:Fear; D005260:Female; D006801:Humans; D008297:Male; D010698:Phobic Disorders / Q000145:classification* / Q000175:diagnosis* / Q000453:epidemiology; D011569:Psychiatric Status Rating Scales; D011795:Surveys and Questionnaires; D055815:Young Adult