title: Self-poisoning with medications in adolescents: a national register study of hospital admissions and readmissions.
abstract: OBJECTIVE
  To examine characteristics of hospital admissions and risk factors associated with rehospitalization for self-poisoning with medications in adolescents aged 10-19 years.
  
  
  METHODS
  This study used data from the Norwegian Patient Register from 2008 to 2011. The main outcome was hospital readmission within the observation period. A complementary log-log regression model was used to assess the effect of characteristics at index hospital admission on readmission.
  
  
  RESULTS
  Of 1497 patients, 76.4% were females and 89.8% were aged 15-19 years. At their first hospital admission, about one third received a secondary psychiatric diagnosis. Females (47.5%) were registered with an E-code for intentional self-harm more often than males (33.7%), and females were more often than males discharged to further treatment (27.8% vs. 21.5%). As many as 18.4% were rehospitalized for self-poisoning by medications. Significant predictors for hospital readmission were female sex [hazard ratio (HR) = 2.4, 95% confidence interval (CI) 1.7-3.6], discharge to further treatment (HR = 2.3, 95% CI 1.8-2.9) and psychiatric secondary diagnoses (HR = 1.5, 95% CI 1.2-1.9).
  
  
  CONCLUSIONS
  This national study demonstrated significant sex differences in adolescents treated in hospital for self-poisoning with medications. Psychiatric secondary diagnoses had a strong predictive effect on readmission, which indicates the importance of psychiatric/psychosocial assessment of adolescents who are admitted to hospital for self-poisoning with medications.
authors.affiliation: National Centre for Suicide Research and Prevention, Institute of Clinical Medicine, University of Oslo, Norway. Electronic address: fadumelin@gmail.com.
authors.forename: Elin Anita
authors.initials: EA
authors.lastname: Fadum
authors.affiliation: National Centre for Suicide Research and Prevention, Institute of Clinical Medicine, University of Oslo, Norway; Department of Psychiatry, Columbia University College of Physicians and Surgeons, New York, NY, USA; Molecular Imaging and Neuropathology Division and Suicide Prevention Training, Implementation and Evaluation Program in the Center for Practice Innovation, New York State Psychiatric Institute, New York, NY, USA.
authors.forename: Barbara
authors.initials: B
authors.lastname: Stanley
authors.affiliation: National Centre for Suicide Research and Prevention, Institute of Clinical Medicine, University of Oslo, Norway.
authors.forename: Ping
authors.initials: P
authors.lastname: Qin
authors.affiliation: National Centre for Suicide Research and Prevention, Institute of Clinical Medicine, University of Oslo, Norway; Department of Biostatistics, Epidemiology and Health Economics, Oslo University Hospital, Norway.
authors.forename: Lien My
authors.initials: LM
authors.lastname: Diep
authors.affiliation: National Centre for Suicide Research and Prevention, Institute of Clinical Medicine, University of Oslo, Norway.
authors.forename: Lars
authors.initials: L
authors.lastname: Mehlum
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D004632:Emergency Medical Services / Q000706:statistics & numerical data*; D005260:Female; D006801:Humans; D008297:Male; D001523:Mental Disorders / Q000453:epidemiology*; D009664:Norway / Q000453:epidemiology; D010359:Patient Readmission / Q000706:statistics & numerical data*; D012042:Registries / Q000706:statistics & numerical data*; D012651:Self Medication / Q000706:statistics & numerical data*; D016728:Self-Injurious Behavior / Q000453:epidemiology*; D012737:Sex Factors; D013406:Suicide, Attempted / Q000706:statistics & numerical data; D055815:Young Adult
keywords: Adolescent; Emergency health services; Poisoning; Self-injurious behavior; Self-poisoning