title: Major depression in community adolescents: age at onset, episode duration, and time to recurrence.
abstract: OBJECTIVE
  This paper presents retrospective and prospective data regarding time course parameters of major depressive disorder (MDD) in community adolescents (14 to 18 years old): time to onset and recovery and, among those who recovered, time to recurrence.
  
  
  METHODS
  Diagnostic interviews were conducted with 1,508 randomly selected high school students. Three hundred sixty-two had experienced at least one past or current episode of MDD.
  
  
  RESULTS
  Mean age at onset of first episode was 14.9 (SD = 2.8). Early MDD onset was associated with female gender and suicidal ideation. MDD episode duration ranged from 2 to 520 weeks, with a mean of 26.4 weeks (SE = 3.3) and a median of 8.0 weeks. Longer episodes were observed in those whose depression occurred early (at or before age 15), whose depression had been accompanied by suicidal ideation, and for whom treatment was sought. Of the adolescents who recovered, 5% relapsed within 6 months, 12% within 1 year, and approximately 33% within 4 years. Shorter time to recurrence was associated with prior suicidal ideation and attempt and with later first onset.
  
  
  CONCLUSIONS
  Risk of MDD is low in childhood, increasing substantially with adolescence. The majority of episodes in community adolescents are relatively brief, although the risk of recurrence is substantial. Suicidal behaviors are important mediators of episode duration and of recurrence.
authors.affiliation: Oregon Research Institute, Eugene 97403-1983.
authors.forename: P M
authors.initials: PM
authors.lastname: Lewinsohn
authors.forename: G N
authors.initials: GN
authors.lastname: Clarke
authors.forename: J R
authors.initials: JR
authors.lastname: Seeley
authors.forename: P
authors.initials: P
authors.lastname: Rohde
mesh_terms: D000293:Adolescent; D000328:Adult; D017668:Age of Onset; D002648:Child; D002675:Child, Preschool; D015331:Cohort Studies; D003156:Community Mental Health Services; D003866:Depressive Disorder / Q000150:complications / Q000175:diagnosis / Q000453:epidemiology*; D005260:Female; D006801:Humans; D008297:Male; D009922:Oregon / Q000453:epidemiology; D011446:Prospective Studies; D011569:Psychiatric Status Rating Scales; D000297:Psychology, Adolescent; D012008:Recurrence; D012189:Retrospective Studies; D012307:Risk Factors; D013406:Suicide, Attempted; D013997:Time Factors; D014481:United States / Q000453:epidemiology