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Some statistical considerations on dietary assessment methods.

R Borrelli1, T J Cole, G Di Biase

  • 1MRC Dunn Nutrition Unit, Cambridge, UK.

European Journal of Clinical Nutrition
|July 1, 1989
PubMed
Summary
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Assessing nutrient intake in elderly individuals revealed poor agreement among diet history, 24-hour recall, and 3-day food records. Findings suggest significant bias in at least two dietary assessment methods.

Area of Science:

  • Nutritional Science
  • Gerontology
  • Biostatistics

Background:

  • Accurate dietary assessment is crucial for understanding nutrient intake in elderly populations.
  • Multiple methods exist for dietary assessment, each with potential limitations.
  • Evaluating the agreement between these methods is essential for reliable nutritional research.

Purpose of the Study:

  • To compare the agreement of three dietary assessment methods (diet history, 24-hour recall, 3-day record) for 18 nutrients.
  • To identify potential biases in commonly used dietary assessment tools.
  • To discuss statistical approaches for improving dietary assessment in epidemiological studies.

Main Methods:

  • Utilized diet history, 24-hour recall, and 3-day food records to assess nutrient intake in 230 elderly individuals.

Related Experiment Videos

  • Employed statistical criteria including correlation coefficient, mean difference, and proportion of individuals in the same distribution thirds to evaluate method agreement.
  • Discussed theoretical considerations regarding the utility of different statistical measures for agreement assessment.

    • Main Results:

    • The correlation coefficient was deemed unsuitable for assessing agreement between dietary assessment methods.
    • Diet history tended to overestimate nutrient intake, while 24-hour recall tended to underestimate it compared to the 3-day record.
    • Poor agreement was observed among the three methods for most nutrients, indicated by large standard errors and low proportions of individuals in similar intake categories.

    Conclusions:

    • Significant bias is likely present in at least two of the three dietary assessment methods evaluated.
    • The findings highlight the need for critical evaluation and potential improvement of dietary assessment techniques in elderly populations.
    • Statistical methods for enhancing the validity of diet records in epidemiological research warrant further consideration.