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Related Experiment Videos

Improving food frequency questionnaires: a qualitative approach using cognitive interviewing

A F Subar1, F E Thompson, A F Smith

  • 1National Cancer Institute, Division of Cancer Prevention and Control, Bethesda, MD 20892-7344, USA.

Journal of the American Dietetic Association
|July 1, 1995
PubMed
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Cognitive interviewing refined food frequency questionnaires (FFQs) by identifying and fixing issues with question design and data interpretation. This improves dietary assessment accuracy and usability for researchers.

Area of Science:

  • Nutrition Science
  • Dietary Assessment Methodology

Background:

  • Standard self-administered food frequency questionnaires (FFQs) face challenges in data quality and ease of administration.
  • Existing FFQ formats may present difficulties in accurately capturing consumption frequency, portion size, seasonal variations, and food preparation methods.

Purpose of the Study:

  • To enhance the data quality and administrative ease of standard food frequency questionnaires.
  • To identify and address problematic features within FFQs through cognitive refinement.

Main Methods:

  • Utilized cognitive interviewing, where respondents verbalized their thought processes while completing FFQ variations.
  • Employed interviewer observation and probe questions to identify respondent-verbalized problems and inconsistencies.
  • Synthesized interviewer and observer consensus to pinpoint specific areas of difficulty within FFQs.

Related Experiment Videos

Main Results:

  • Identified key problematic areas in FFQs including question formatting (frequency, portion size), calculation of average frequencies (aggregated/seasonal foods), item comprehension, and food ordering.
  • Implemented cognitive refinements, introducing detailed questions on food preparation, seasonal intake, portion size ranges, and expanded frequency categories.
  • Demonstrated the effectiveness of cognitive interviewing in uncovering and resolving cognitive issues in dietary questionnaires.

Conclusions:

  • Cognitive interviewing is a crucial step for identifying and rectifying cognitive challenges in dietary assessment tools.
  • Refinements based on cognitive interviewing enhance the specificity and accuracy of dietary intake data collected via FFQs.
  • The study provides a framework for improving the design and administration of food frequency questionnaires for better nutritional research.