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Mean proportion and population proportion: two answers to the same question?

S M Krebs-Smith1, P S Kott, P M Guenther

  • 1Human Nutrition Information Service, U.S. Department of Agriculture, Hyattsville, Maryland 20782.

Journal of the American Dietetic Association
|May 1, 1989
PubMed
Summary

Dietary cholesterol intake can be calculated in two ways: mean proportion per person or population proportion. Understanding the difference is crucial for accurate interpretation of dietary data.

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Area of Science:

  • Nutritional Science
  • Dietary Assessment
  • Biostatistics

Background:

  • Questions about dietary cholesterol sources, like eggs, can have ambiguous interpretations.
  • Two distinct methods exist for calculating cholesterol proportions: mean proportion and population proportion.
  • These methods, while both valid, can yield different results due to statistical variations.

Purpose of the Study:

  • To clarify the two distinct methods for calculating dietary cholesterol proportions.
  • To explain the factors causing discrepancies between mean and population proportions.
  • To discuss the implications for reporting and interpreting dietary intake data.

Main Methods:

  • Calculation of mean proportion: individual proportions averaged across a group.

Related Experiment Videos

  • Calculation of population proportion: total egg cholesterol divided by total dietary cholesterol for the entire group.
  • Analysis of factors influencing differences: ratio variation, denominator variation, and ratio-denominator correlation.

    • Main Results:

    • Mean and population proportions often yield similar results but can differ significantly.
    • Differences arise from variations in individual dietary patterns and correlations between cholesterol sources.
    • Each method answers a specific question: average per person vs. overall population intake.

    Conclusions:

    • Ambiguity in calculating dietary proportions can lead to misinterpretation of intake data.
    • Clear reporting and understanding of the calculation method (mean vs. population proportion) are essential.
    • Awareness of these statistical differences improves the accuracy of dietary assessment and public health recommendations.