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Related Experiment Videos

Is schizophrenia really on the decrease?

P Munk-Jørgensen1, P B Mortensen

  • 1Institute of Psychiatric Demography, Aarhus, Denmark.

European Archives of Psychiatry and Clinical Neuroscience
|January 1, 1993
PubMed
Summary
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Schizophrenia first admissions in Denmark declined between 1971-1991. This decrease in schizophrenia rates may be genuine, despite changes in healthcare and diagnostic practices.

Area of Science:

  • Psychiatry
  • Epidemiology
  • Public Health

Background:

  • Schizophrenia admission rates are a key indicator of mental health trends.
  • Understanding long-term trends in schizophrenia is crucial for public health planning.

Purpose of the Study:

  • To analyze trends in first admission rates for schizophrenia in Denmark from 1971 to 1991.
  • To investigate potential factors influencing observed changes in schizophrenia incidence.

Main Methods:

  • Utilized the Danish nation-wide psychiatric case register for data from 1971 to 1991.
  • Employed age-standardized rates to assess schizophrenia first admissions for males and females.
  • Controlled for changes in diagnostic delay and diagnostic patterns.

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Main Results:

  • Directly age-standardized rates of first admission schizophrenia significantly decreased for both males (-0.16/100,000) and females (-0.13/100,000) over the 20-year period.
  • The observed decrease remained significant after controlling for diagnostic changes.
  • Potential contributing factors include changes in treatment facility organization, reduced bed availability, and increased suicide rates.

Conclusions:

  • The study suggests a genuine decrease in schizophrenia first admission rates in Denmark.
  • Healthcare system changes and potential underdiagnosis in certain populations may influence these trends.
  • Further research into etiological factors, including prenatal influences, is warranted.