title: [Assessment of complex PTSD - internal and external validity of a diagnostic interview].
abstract: BACKGROUND
  The diagnostic construct of complex posttraumatic stress disorder (complex PTSD) describes the consequences of early onset and long-term persisting psychological traumatizations. The interview for complex PTSD (I-kPTBS) - is the German adaptation of the structured interview for disorders of extreme stress (SIDES). The present study reports first data regarding the internal validity of the I-kPTBS as well as on the external validity of the diagnosis of complex PTSD.
  
  
  METHODS
  The I-kPTBS was applied in 72 consecutive patients of a specialized outpatient clinic. 31 patients fulfilled the criteria of the diagnosis complex PTSD. 25 suffered from a PTSD but did not fulfil the diagnostic criteria of complex PTSD. Both groups where compared regarding their symptoms, resources and reports of childhood events.
  
  
  RESULTS
  Internal consistence of the I-kPTBS regarding the sample was good to excellent (alpha = 0.88). As expected, patients with the diagnosis of complex PTSD showed more severe dissociative, depressive and general anxiety symptoms than patients with PTSD alone. Patients fulfilling the criteria of complex PTSD reported a lower age at their first traumatic event, more multiple traumatizations and more often a dissociative disorder as comorbid diagnosis. Patients with complex PTSD show a higher traumaload in childhood and a lower level of compensatory resources.
  
  
  CONCLUSIONS
  The interview for complex PTSD (I-kPTBS) describes a consistent diagnostic construct. The results demonstrate that the diagnosis of complex PTSD selects a specific group of patients with early childhood trauma and high symptom level. Specific criteria can differentiate this patient group well from patients that suffer from PTSD alone.
authors.affiliation: Klinikum rechts der Isar der TU München, Klinik und Poliklinik für Psychosomatische Medizin und Psychotherapie.
authors.forename: Katja
authors.initials: K
authors.lastname: Boroske-Leiner
authors.forename: Arne
authors.initials: A
authors.lastname: Hofmann
authors.forename: Martin
authors.initials: M
authors.lastname: Sack
mesh_terms: D000328:Adult; D017668:Age of Onset; D001008:Anxiety Disorders / Q000175:diagnosis / Q000523:psychology; D015897:Comorbidity; D003866:Depressive Disorder / Q000175:diagnosis / Q000523:psychology; D004213:Dissociative Disorders / Q000175:diagnosis / Q000523:psychology; D005260:Female; D006801:Humans; D038801:International Classification of Diseases; D007406:Interview, Psychological; D008016:Life Change Events; D008297:Male; D008875:Middle Aged; D010552:Personality Assessment / Q000706:statistics & numerical data*; D010555:Personality Inventory / Q000706:statistics & numerical data; D011594:Psychometrics / Q000706:statistics & numerical data; D015203:Reproducibility of Results; D013001:Somatoform Disorders / Q000175:diagnosis / Q000523:psychology; D013313:Stress Disorders, Post-Traumatic / Q000175:diagnosis* / Q000523:psychology