title: Is the stressor criterion dispensable?: a contribution to the criterion A debate from a Swiss sample of survivors of the 2004 tsunami.
abstract: BACKGROUND
  The stressor criterion (criterion A) in the DSM-IV diagnosis of posttraumatic stress disorder (PTSD) is frequently questioned. To explore the clinical and diagnostic usefulness of criterion A, we examined its value in predicting and capturing PTSD symptom clusters (criteria B-D) in a sample of trauma survivors.
  
  
  METHODS
  We studied 342 adult German-speaking Swiss tourists affected by the 2004 tsunami. We analyzed sensitivity and specificity, predictive value and variance explanation of criterion A for evoking PTSD criteria B-D.
  
  
  RESULTS
  Sensitivity of criterion A for PTSD criteria B-D was 93.2%, while positive predictive value was 23.1%. Criterion A made a small, yet statistically significant contribution of 7.5% for PTSD symptom clusters B-D.
  
  
  CONCLUSIONS
  The assessment of criterion A (A1 and A2) is not necessary for the identification of individuals suffering from PTSD symptoms according to DSM-IV. We suggest therefore that criterion A is a dispensable part of the diagnosis of PTSD.
authors: Department of Psychiatry, University Hospital Zürich, Zürich, Switzerland. bernd.kraemer@usz.ch
authors: Bernd
authors: B
authors: Kraemer
authors: Lutz
authors: L
authors: Wittmann
authors: Josef
authors: J
authors: Jenewein
authors: Thomas
authors: T
authors: Maier
authors: Ulrich
authors: U
authors: Schnyder
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D039721:Diagnostic and Statistical Manual of Mental Disorders; D005239:Fear; D005260:Female; D006380:Helplessness, Learned; D006801:Humans; D008016:Life Change Events; D008297:Male; D008875:Middle Aged; D011594:Psychometrics / Q000706:statistics & numerical data; D015203:Reproducibility of Results; D013313:Stress Disorders, Post-Traumatic / Q000175:diagnosis* / Q000523:psychology; D011795:Surveys and Questionnaires; D017741:Survivors / Q000523:psychology*; D013557:Switzerland; D057192:Tsunamis; D055815:Young Adult