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Related Experiment Videos

The Zurich Study: participation patterns and Symptom Checklist 90-R scores in six interviews, 1979-99.

D Eich1, V Ajdacic-Gross, M Condrau

  • 1Psychiatric University Hospital Zurich, Switzerland.

Acta Psychiatrica Scandinavica. Supplementum
|September 6, 2003
PubMed
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Participation in the long-term Zurich Study is linked to mental health. Extreme scores on the Symptom Checklist 90-R (SCL-90-R) indicate higher likelihood of drop-out in psychiatric epidemiology research.

Area of Science:

  • Psychiatric epidemiology
  • Longitudinal studies
  • Mental health research

Background:

  • The Zurich Study, initiated in the late 1970s, is a significant longitudinal research project.
  • The sixth interview wave in 1999 allows for an updated analysis of participation and attrition patterns.

Purpose of the Study:

  • To investigate and update participation and drop-out patterns in the Zurich Study.
  • To analyze the relationship between health status and study attrition.

Main Methods:

  • Descriptive analyses of participation and drop-out.
  • Utilized the Symptom Checklist 90-R (SCL-90-R) for sample stratification and health status assessment.
  • Analyzed data from 367 subjects interviewed in 1999.

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Main Results:

  • The proportion of high-scorers to low-scorers on the SCL-90-R remained stable.
  • Participation and drop-out were selectively dependent on health status.
  • Subjects with extremely high or extremely low SCL-90-R scores showed increased likelihood of drop-out in recent interviews.

Conclusions:

  • Drop-out in the Zurich Study is associated with extreme scores on the Symptom Checklist 90-R.
  • Health status, as indicated by SCL-90-R scores, influences long-term participation in psychiatric research.