title: Identifying men at ultra high risk of psychosis in a prison population.
abstract: BACKGROUND
  The prevalence of psychotic disorders among prisoners is relatively high. We sought to investigate the prevalence of men who have a very high risk of developing psychosis in a prison population.
  
  
  METHODS
  The Prodromal Questionnaire - Brief Version (Loewy, Pearson, Vinogradov, Bearden and Cannon, 2011), was used to screen newly-arrived prisoners in a London prison for features associated with an increased risk of psychosis. Concurrent validity was evaluated using the Comprehensive Assessment for At Risk Mental State (Yung et al., 2005).
  
  
  RESULTS
  750 prisoners were screened and 301 were underwent further clinical assessment. 5% the total number of those screened met diagnostic criteria for the ARMS and 3% had recently developed a first episode of psychosis. Using endorsement of items that also caused distress, the PQ-B predicted an ARMS or a psychotic disorder with 90% sensitivity and 44% specificity.
  
  
  CONCLUSIONS
  The PQ-B is effective in identifying people who are vulnerable to developing psychosis in a prison population.
authors.affiliation: King's College London, King's Health Partners, Institute of Psychiatry, De Crespigny Road, London, SE5 8AF, United Kingdom. manuela.jarrett@kcl.ac.uk
authors.forename: Manuela
authors.initials: M
authors.lastname: Jarrett
authors.forename: Tom
authors.initials: T
authors.lastname: Craig
authors.forename: Janet
authors.initials: J
authors.lastname: Parrott
authors.forename: Andrew
authors.initials: A
authors.lastname: Forrester
authors.forename: Toby
authors.initials: T
authors.lastname: Winton-Brown
authors.forename: Helen
authors.initials: H
authors.lastname: Maguire
authors.forename: Philip
authors.initials: P
authors.lastname: McGuire
authors.forename: Lucia
authors.initials: L
authors.lastname: Valmaggia
mesh_terms: D000328:Adult; D006801:Humans; D008131:London; D008297:Male; D015995:Prevalence; D011329:Prisoners; D011569:Psychiatric Status Rating Scales; D011618:Psychotic Disorders / Q000175:diagnosis* / Q000453:epidemiology*; D012372:ROC Curve; D012307:Risk Factors; D012680:Sensitivity and Specificity; D011795:Surveys and Questionnaires