title: Association between trauma exposure and delusional experiences in a large community-based sample.
abstract: BACKGROUND
  Surveys have found that otherwise well individuals report delusional experiences. Previous studies have shown an association between psychotic symptoms and exposure to trauma.
  
  
  OBJECTIVE
  To explore the association between trauma and delusional experiences in a community sample.
  
  
  METHODS
  Respondents (n=10 641) were assessed for delusional experiences, exposure to various types of traumatic experiences and the presence of post-traumatic stress disorder (PTSD). The endorsement of delusional items was examined in people exposed to traumatic events who did or did not have PTSD.
  
  
  RESULTS
  Exposure to any traumatic event but without the development of PTSD was associated with increased endorsement of delusional experiences (relative risk 2.68, 95% CI 2.18-3.30) and there was a significant dose-response relationship between the number of types of traumatic events and endorsement of such experiences (chi(2) =26.74, d.f.=2, P<0.001). A diagnosis of PTSD further increased endorsement of delusional experiences (RR=9.24, 95% CI 6.95-12.27). The association between PTSD and delusional experiences remained significant after adjusting for factors associated with psychotic symptoms.
  
  
  CONCLUSIONS
  Further investigation into the pathways between trauma, delusions and psychosis may provide insights into shared aetiological mechanisms underpinning these conditions.
authors.affiliation: Kids in Mind Research, Mater Children's Hospital, South Brisbane and Queensland Centre for Mental Health Research, Wacol, Queensland.
authors.forename: James
authors.initials: J
authors.lastname: Scott
authors.forename: David
authors.initials: D
authors.lastname: Chant
authors.forename: Gavin
authors.initials: G
authors.lastname: Andrews
authors.forename: Graham
authors.initials: G
authors.lastname: Martin
authors.forename: John
authors.initials: J
authors.lastname: McGrath
mesh_terms: D000059:Accidents / Q000523:psychology*; D000328:Adult; D000368:Aged; D003430:Cross-Sectional Studies; D003702:Delusions / Q000209:etiology*; D005260:Female; D006801:Humans; D008016:Life Change Events; D008297:Male; D008875:Middle Aged; D011569:Psychiatric Status Rating Scales; D011618:Psychotic Disorders / Q000209:etiology*; D012307:Risk Factors; D013313:Stress Disorders, Post-Traumatic / Q000209:etiology*; D014754:Violence / Q000523:psychology*