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The "case-control" study: valid selection of subjects.

O S Miettinen

    Journal of Chronic Diseases
    |January 1, 1985
    PubMed
    Summary

    Proper subject selection is crucial for valid case-control studies, ensuring representativeness and comparability of data between cases and controls for accurate results.

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    Area of Science:

    • Epidemiology
    • Biostatistics
    • Public Health Research

    Background:

    • Case-control studies are essential for investigating disease etiology.
    • Understanding the study base is critical for valid subject selection.
    • These studies are not alternatives to cohort studies but complement them.

    Purpose of the Study:

    • To clarify the principles of subject selection in case-control studies.
    • To differentiate between primary and secondary study base definitions.
    • To emphasize the importance of representativeness and comparability.

    Main Methods:

    • Defining case-control studies in relation to census-ascertainment.
    • Describing subject selection strategies for primary study bases.
    • Outlining methods for secondary study base sampling.

    Main Results:

    • Subject selection depends on whether the study base is defined a priori (primary) or secondarily.
    • Primary bases require representative sampling of cases and controls.
    • Secondary bases necessitate sampling controls unrelated to the determinant.

    Conclusions:

    • Valid case-control studies depend on careful subject selection for representativeness and comparability.
    • Both primary and secondary base definitions have distinct sampling implications.
    • Ensuring comparable determinant information accuracy is vital for all case-control designs.

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