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Conditional probabilities and the grid test for schizophrenic thought disorder

R Allon, M F Stewart, W J Lancee

    The British Journal of Clinical Psychology
    |February 1, 1981
    PubMed
    Summary
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    The grid test for schizophrenic thought disorder is not a reliable diagnostic tool. This study found it unsatisfactory for identifying schizophrenia in psychiatric patients.

    Area of Science:

    • Psychiatry
    • Clinical Psychology
    • Psychopathology

    Background:

    • Schizophrenia is a complex mental disorder characterized by thought disturbances.
    • Accurate diagnosis of schizophrenia is crucial for effective treatment.
    • The grid test has been proposed as a tool to assess thought disorder in schizophrenia.

    Purpose of the Study:

    • To evaluate the diagnostic efficiency of the grid test for schizophrenic thought disorder.
    • To determine population-specific cutting scores for the grid test.
    • To assess the utility of the grid test as a diagnostic instrument.

    Main Methods:

    • Administered the grid test to 149 psychiatric patients.
    • Calculated population-specific cutting scores based on known schizophrenia and thought disorder base rates.

    Related Experiment Videos

  • Analyzed diagnostic efficiency using conditional probability formulae and previous study data.

    • Main Results:

    • The grid test's diagnostic efficiency was analyzed.
    • Population-specific cutting scores were derived for the grid test.
    • Data from previous grid test studies were incorporated into the analysis.

    Conclusions:

    • The grid test for schizophrenic thought disorder is considered unsatisfactory.
    • The grid test is not recommended as a reliable diagnostic instrument for schizophrenia.