title: Repetition of acute poisoning in Oslo: 1-year prospective study.
abstract: BACKGROUND
  The repetition of acute poisoning occurs frequently. The intention may change between episodes and many poisonings are treated outside the hospital setting. Few studies have taken this into account.
  
  
  OBJECTIVE
  To quantify the repetition frequency regardless of the level of health care or the intention behind the poisoning, and to identify possible risk factors for repetition.
  
  
  METHODS
  A prospective multicentre study of all acute poisonings in Oslo treated in hospital, at an out-patient clinic or by the ambulance service. Repetition was estimated using Kaplan-Meier calculations, and predictive factors were identified using Cox regression analysis.
  
  
  RESULTS
  The estimated 1-year repetition rate was 30% (95% CI 24-35). Independent predictors of repetition were middle age (30-49 years), poisoning with opiates or sedatives, unemployment or living on social welfare, a previous suicide attempt, and a history of psychiatric treatment. Intention was not a significant predictor.
  
  
  CONCLUSIONS
  Repetition of acute poisoning is high, irrespective of the level of healthcare and the intention behind the poisoning.
authors.affiliation: Department of Acute Medicine, Ullevaal University Hospital, Oslo, Norway. fridtjof.heyerdahl@medisin.uio.no
authors.forename: Fridtjof
authors.initials: F
authors.lastname: Heyerdahl
authors.forename: Mari Asphjell
authors.initials: MA
authors.lastname: Bjornaas
authors.forename: Rune
authors.initials: R
authors.lastname: Dahl
authors.forename: Knut Erik
authors.initials: KE
authors.lastname: Hovda
authors.forename: Anne Kathrine
authors.initials: AK
authors.lastname: Nore
authors.forename: Oivind
authors.initials: O
authors.lastname: Ekeberg
authors.forename: Dag
authors.initials: D
authors.lastname: Jacobsen
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D062787:Drug Overdose / Q000453:epidemiology; D004812:Epidemiologic Methods; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009664:Norway / Q000453:epidemiology; D012008:Recurrence; D016728:Self-Injurious Behavior / Q000453:epidemiology / Q000523:psychology*; D013406:Suicide, Attempted / Q000523:psychology*; D055815:Young Adult