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Related Experiment Videos

Standardised coding of diet records: experiences from INTERMAP UK.

Rana Conway1, Claire Robertson, Barbara Dennis

  • 1Department of Nutrition and Dieics, Kings College London, London, UK.

The British Journal of Nutrition
|May 22, 2004
PubMed
Summary

Accurate diet record coding is crucial for reliable nutrition research. The INTERMAP study implemented rigorous training and a standardized codebook to minimize coding errors, improving data quality for energy and nutrient intake estimates.

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Area of Science:

  • Nutrition Science
  • Epidemiology
  • Data Management

Background:

  • Dietary surveys rely on accurate coding of food records, a process prone to errors.
  • Errors in coding diet records can significantly impact the validity of study results and nutrient intake estimations.

Purpose of the Study:

  • To describe methods used to minimize errors in coding diet records within the INTERnational study of MAcro- and micronutrients and blood Pressure (INTERMAP).
  • To highlight the importance of standardized coding practices and quality control in dietary assessment.

Main Methods:

  • Centralized training and certification of staff for processing diet records.
  • Implementation of ongoing quality control, including senior nutritionist re-coding of selected records.
  • Development of a standardized codebook for the UK, including brand item coding, density, portion size, and default codes.

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Main Results:

  • Initial coding errors by trainees, even experienced ones, affected energy and nutrient intake estimates.
  • Error rates decreased as training progressed.
  • Codebook compilation was labor-intensive, requiring extensive data collection from food manufacturers.

Conclusions:

  • Rigorous training and quality control measures are effective in reducing diet record coding errors.
  • Standardized coding practices and resources like codebooks are essential for reliable dietary survey data.
  • Efforts to standardize and streamline diet record coding are needed to reduce repetitive work for research groups.