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Studies without internal controls.

J C Bailar, T A Louis, P W Lavori

    The New England Journal of Medicine
    |July 19, 1984
    PubMed
    Summary
    This summary is machine-generated.

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    Studies lacking internal controls can still yield valuable clinical insights. Five features, including pre-defined hypotheses and intent, enhance the strength and generalizability of these investigations.

    Area of Science:

    • Clinical Investigation
    • Medical Research Methodology

    Background:

    • Clinical research questions sometimes necessitate investigations without concurrent internal controls.
    • External controls, such as historical controls, are often employed in such studies.
    • Studies with weak or absent internal controls play a unique, albeit small, role in clinical investigation.

    Purpose of the Study:

    • To examine clinical treatment studies with weak or absent internal controls.
    • To identify features that can strengthen such investigations.
    • To highlight the importance of these studies despite potential pitfalls.

    Main Methods:

    • Analysis of recent examples from the Journal illustrating studies with weak or absent internal controls.
    • Examination of five interrelated features that enhance the strength of these studies.

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    Main Results:

    • Five key features can bolster the credibility of studies lacking internal controls.
    • These features include investigator intent, pre-planned analysis, articulated hypotheses, consideration of opposite outcomes, and generalizability.
    • Carefully selected and reported studies without internal controls can contribute significantly to scientific knowledge.

    Conclusions:

    • Studies without internal controls, when carefully designed and reported, can be scientifically valuable.
    • The identified features provide a framework for strengthening and interpreting findings from such studies.
    • These investigations, despite their limitations, are essential for advancing clinical knowledge.