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A quantitative evaluation of competing risks in occupational studies.

S P Tsai, C P Wen

Annals of the Academy of Medicine, Singapore

|April 1, 1984

Summary

Competing risks in mortality analysis can skew results. This study introduces a method to adjust for competing causes of death, improving the accuracy of relative risk calculations, especially in populations with differing mortality rates.

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Area of Science:

Epidemiology
Biostatistics
Public Health

Background:

Individuals face multiple competing causes of death, but only one can occur.
Accurate cause-specific mortality comparisons between populations require adjustment for these competing risks.
Differences in mortality from other causes can significantly impact comparative analyses.

Purpose of the Study:

To develop and present a method for adjusting relative risk calculations for competing causes of death.
To identify key factors influencing the significance of competing risks in mortality analysis.

Main Methods:

Developed a novel method for incorporating competing risks into relative risk calculations.
Identified three critical factors influencing the impact of competing risks: overall mortality risk, differential risk for other causes, and age interval.

Main Results:

The significance of competing risks increases with higher overall population mortality risk.
Larger differences in mortality from other causes between populations amplify the impact of competing risks.
Wider age intervals in mortality calculations also increase the influence of competing risks.
An example using refinery cohort data demonstrated a potential 9% overestimation of relative risk without competing risk adjustment in specific age groups.

Conclusions:

Adjusting for competing causes of death is crucial for accurate cause-specific mortality comparisons.
The developed method provides a framework for more meaningful epidemiological and biostatistical analyses.
While the impact can be significant, as shown in the example, it may be relatively small in certain contexts.

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