title: Prevalence of psychopathology in preschool-age children.
abstract: OBJECTIVE
  Little is known about psychopathology in preschool-age children.
  
  
  METHODS
  A review of representative studies of psychiatric disorders in preschoolers.
  
  
  RESULTS
  Sample sizes ranged from 104 to 3,860 subjects, ages 1 to 9 years. Prevalence rates of psychiatric disorders varied from 0.1% to 26.4%; high rates of co-morbidity were reported.
  
  
  CONCLUSIONS
  Studies addressing psychiatric disorders in preschoolers are extremely limited. Future research is needed to improve the diagnosis, treatment, and outcomes in preschool-age children.
authors.affiliation: Pediatric Psychopharmacology Research, Massachussetts General Hospital, Boston, USA. mjohnson20@partners.org
authors.forename: Mary Ann
authors.initials: MA
authors.lastname: McDonnell
authors.forename: Carol
authors.initials: C
authors.lastname: Glod
mesh_terms: D017677:Age Distribution; D001008:Anxiety Disorders / Q000453:epidemiology; D001289:Attention Deficit Disorder with Hyperactivity / Q000453:epidemiology; D002648:Child; D002675:Child, Preschool; D015897:Comorbidity; D019955:Conduct Disorder / Q000453:epidemiology; D006801:Humans; D007223:Infant; D001523:Mental Disorders / Q000453:epidemiology*; D019964:Mood Disorders / Q000453:epidemiology; D015995:Prevalence; D014481:United States / Q000453:epidemiology