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Matching in epidemiologic studies: validity and efficiency considerations

L L Kupper, J M Karon, D G Kleinbaum

    Biometrics
    |June 1, 1981
    PubMed
    Summary
    This summary is machine-generated.

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    Matching can improve efficiency in follow-up and case-control studies, especially when accounting for confounders. However, random sampling may be more efficient if matching significantly reduces the comparison group size.

    Area of Science:

    • Epidemiology
    • Biostatistics

    Background:

    • Subject selection methods like matching and random sampling are crucial in follow-up and case-control studies.
    • Efficiency and validity are key considerations when choosing between these methods.

    Purpose of the Study:

    • To evaluate the validity and efficiency of matching versus random sampling for subject selection.
    • To analyze the impact of matching constraints on study efficiency.

    Main Methods:

    • Comparison of confidence intervals for effect measures (risk ratio, risk difference, odds ratio) under matching and random sampling.
    • Analysis considering dichotomous disease, exposure, and matching factors.

    Main Results:

    • Matching on confounders generally increases efficiency in follow-up studies.

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  • In case-control studies, matching offers similar benefits but can sometimes reduce efficiency.
  • Random sampling may be more efficient when matching substantially shrinks the comparison group.

    • Conclusions:

    • The decision to match should prioritize efficiency considerations.
    • Matching is advantageous when it controls for confounding factors.
    • The relative efficiency depends on the study design and the impact of matching on sample size.