title: Severity of depressive episodes during the course of depressive disorder.
abstract: BACKGROUND
  It is not clear whether the severity of depressive episodes changes during the course of depressive disorder.
  
  
  OBJECTIVE
  To investigate whether the severity of depressive episodes increases during the course of illness.
  
  
  METHODS
  Using a Danish nationwide case register, all psychiatric in-patients and out-patients with a main ICD-10 diagnosis of a single mild, moderate or severe depressive episode at the end of first contact were identified. Patients included in the study were from the period 1994-2003.
  
  
  RESULTS
  A total of 19 392 patients received a diagnosis of a single depressive episode at first contact. The prevalence of severe depressive episodes increased from 25.5% at the first episode to 50.0% at the 15th episode and the prevalence of psychotic episodes increased from 8.7% at the first episode to 25.0% at the 15th episode. The same pattern was found regardless of gender, age at first contact and calendar year.
  
  
  CONCLUSIONS
  The increasing severity of depressive episodes emphasises the importance of early and sustained prophylactic treatment.
authors: Department of Psychiatry, University Hospital of Copenhagen, Rigshospitalet, Copenhagen, Denmark. lars.kessing@rh.dk
authors: Lars Vedel
authors: LV
authors: Kessing
mesh_terms: D000328:Adult; D003866:Depressive Disorder / Q000175:diagnosis / Q000523:psychology*; D018450:Disease Progression; D005260:Female; D006801:Humans; D038801:International Classification of Diseases; D008297:Male; D008875:Middle Aged; D011569:Psychiatric Status Rating Scales; D011618:Psychotic Disorders / Q000175:diagnosis / Q000523:psychology*; D012720:Severity of Illness Index; D013997:Time Factors