title: Family aggregation of mental disorders in the nationwide Danish three generation study.
abstract: OBJECTIVE
  The study of familial aggregation of major mental disorders in a national population.
  
  
  METHODS
  Within a Danish register-based cohort study, aggregation of mental disorders was analysed in all case-probands with first psychiatric contact before the age of 19 years in the time period between 1 April 1969 and 29 June 2004 followed up until the age of 35 years, their first-degree relatives, and a matched group of control-probands including their first-degree relatives.
  
  
  RESULTS
  Hazard rate ratios were significantly elevated for cases as compared to controls for all diagnoses among probands, parents, and siblings. Among children of the probands, these ratios were significantly elevated for neurotic (anxiety) disorders, mental retardation, developmental disorders, behavioural and emotional disorders of childhood and adolescence, and miscellaneous disorders. Family aggregation of any diagnosis was significantly higher in probands with substance use disorder, schizophrenia, affective disorders, neurotic (anxiety) disorders, and miscellaneous disorders. There was specificity of familial transmission for affective and neurotic (anxiety) disorders.
  
  
  CONCLUSIONS
  This large nationwide study found some differential patterns of familial aggregation of major mental disorders.
authors.affiliation: Aalborg Psychiatric Hospital, Aarhus University Hospital, Aalborg, Denmark. hc.steinhausen@kjpd.uzh.ch
authors.forename: Hans-Christoph
authors.initials: HC
authors.lastname: Steinhausen
authors.forename: Leslie
authors.initials: L
authors.lastname: Foldager
authors.forename: Gurli
authors.initials: G
authors.lastname: Perto
authors.forename: Povl
authors.initials: P
authors.lastname: Munk-Jørgensen
mesh_terms: D000293:Adolescent; D000328:Adult; D000341:Affective Disorders, Psychotic / Q000453:epidemiology; D001008:Anxiety Disorders / Q000453:epidemiology; D016022:Case-Control Studies; D002648:Child; D002675:Child, Preschool; D015988:Cohort Effect; D003718:Denmark; D005190:Family; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007223:Infant; D008297:Male; D001523:Mental Disorders / Q000175:diagnosis / Q000453:epidemiology* / Q000523:psychology; D016017:Odds Ratio; D010290:Parents; D011569:Psychiatric Status Rating Scales; D012044:Regression Analysis; D035781:Siblings; D055815:Young Adult