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"Rates" of birth defects.

J Schulman¹, G Shaw, S Selvin

¹California Birth Defects Monitoring Program, March of Dimes, Emeryville, California 94608.

|November 1, 1988

Summary

Birth defect data should be reported as prevalence proportion, not a rate. Using "prevalence proportion" accurately reflects the frequency of birth defects, improving data interpretation.

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Area of Science:

Pediatrics
Epidemiology
Public Health

Background:

Accurate reporting of birth defect frequency is crucial for epidemiological studies and public health.
Misinterpretation of data can arise from the incorrect use of terminology in scientific literature.

Purpose of the Study:

To clarify the distinction between a prevalence proportion and a prevalence rate in the context of birth defects.
To recommend precise terminology for reporting birth defect data to enhance clarity and accuracy.

Main Methods:

Conceptual analysis of epidemiological terms.
Review of common practices in reporting birth defect statistics.

Main Results:

The frequency of children born with a specific defect is a proportion, not a rate.
Confusing these terms can lead to misinterpretation of birth defect surveillance data.

Conclusions:

The term "prevalence proportion" or "prevalence" should be consistently used when reporting birth defect frequencies.
Adopting standardized terminology will improve the accuracy and consistency of birth defect data interpretation.

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