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Practical considerations for approximating relative risk by the standardized mortality ratio

M J Symons, J D Taulbee

    Journal of Occupational Medicine. : Official Publication of the Industrial Medical Association
    |June 1, 1981
    PubMed
    Summary

    The standardized mortality ratio (SMR) can approximate relative risk in occupational mortality studies under specific conditions. However, SMR overestimates true relative risk when it exceeds 100%.

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    Area of Science:

    • Epidemiology
    • Occupational Health
    • Biostatistics

    Background:

    • The standardized mortality ratio (SMR) is a common but criticized metric in occupational mortality research.
    • Understanding the conditions for SMR's validity is crucial for accurate risk assessment.

    Purpose of the Study:

    • To identify practical circumstances where the standardized mortality ratio (SMR) can serve as a reasonable approximation of relative risk.
    • To analyze the limitations and potential biases of SMR in occupational mortality studies.

    Main Methods:

    • Comparative analysis of SMR and relative risk under varying mortality rates and age band stratifications.
    • Examination of the impact of consistent versus inconsistent excess mortality across age groups on SMR accuracy.

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    Main Results:

    • SMR consistently overestimates relative risk when the true relative risk surpasses 100%, irrespective of mortality rates or age band size.
    • When excess mortality is uniform across age bands, SMR can approximate relative risk for specific applications like site-specific cancers, provided age bands are not excessively broad.

    Conclusions:

    • The application of SMR requires careful consideration of its inherent overestimation bias, particularly when relative risks are high.
    • SMR may be a useful, albeit imperfect, tool for approximating relative risk in occupational health studies, especially for consistent excess mortality patterns and well-defined age stratifications.