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Perinatal mortality: standardizing for birthweight is biased.

A J Wilcox, I T Russell

    American Journal of Epidemiology
    |December 1, 1983
    PubMed
    Summary

    Standardizing perinatal mortality by birthweight can be misleading. This method is biased against populations with higher birthweights, potentially confusing comparisons of infant mortality rates.

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    Area of Science:

    • Perinatal epidemiology
    • Biostatistics
    • Public health

    Background:

    • Perinatal mortality rates are often compared between populations using standardization techniques.
    • Birthweight is a common factor for standardization due to its association with perinatal outcomes.
    • The validity of standardization relies on specific statistical assumptions that may not hold true for birthweight.

    Purpose of the Study:

    • To evaluate the appropriateness and potential biases of using birthweight standardization for comparing perinatal mortality.
    • To investigate the impact of differing birthweight distributions on standardized mortality rates.

    Main Methods:

    • The study examines the statistical relationship between perinatal mortality and birthweight.
    • It analyzes the conditions under which standardization for birthweight is statistically valid.
    • Simulations or theoretical calculations are used to quantify potential biases.

    Main Results:

    • The relationship between perinatal mortality and birthweight often violates prerequisites for valid standardization.
    • Standardization for birthweight introduces bias against populations with higher average birthweights.
    • A 150g difference in mean birthweight can lead to a 15-25% upward bias in standardized mortality rates for heavier populations.

    Conclusions:

    • Standardization for birthweight is statistically problematic and can lead to misinterpretation of perinatal mortality data.
    • Alternative methods may be necessary for accurate comparisons of perinatal mortality across populations with diverse birthweight profiles.
    • Researchers should exercise caution when interpreting standardized perinatal mortality rates, especially when birthweight distributions vary significantly.

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