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Sampling problems in twin research.

S Torgersen1

  • 1Center for Research in Clinical Psychology, University of Oslo, Norway.

Journal of Psychiatric Research
|January 1, 1987
PubMed
Summary
This summary is machine-generated.

Twin study results vary significantly based on how participants are selected. Ascertainment from mental hospitals is crucial for detecting strong hereditary factors in twin research.

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Area of Science:

  • Psychiatry
  • Genetic Epidemiology
  • Biostatistics

Background:

  • Twin studies are essential for disentangling genetic and environmental influences on health.
  • However, sampling methodologies can introduce biases, affecting the validity of genetic findings.
  • Previous research has highlighted various sampling issues, including small sample sizes and self-selection.

Purpose of the Study:

  • To investigate the impact of different ascertainment procedures on the results of twin studies.
  • To identify which sampling methods are most effective for detecting genetic factors in psychiatric disorders.

Main Methods:

  • Analysis of data from a nationwide Norwegian twin study.
  • Comparison of results based on different ascertainment strategies.

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  • Evaluation of sampling biases, particularly unrepresentative ascertainment.

    • Main Results:

    • The choice of ascertainment procedure significantly influences the outcomes of twin studies.
    • Samples ascertained from mental hospitals treating severe cases are most effective.
    • These specific samples demonstrate stronger evidence for hereditary factors compared to other ascertainment methods.

    Conclusions:

    • Unrepresentative ascertainment poses a significant challenge in twin research.
    • Accurate detection of genetic influences in twin studies depends heavily on the ascertainment strategy.
    • Utilizing samples from specialized psychiatric facilities is recommended for robust genetic analyses in twin studies.