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INTERMAP: the dietary data--process and quality control.

B Dennis1, J Stamler, M Buzzard

  • 1Department of Biostatistics, Collaborative Studies Coordinating Centre, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.

Journal of Human Hypertension
|September 19, 2003
PubMed
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The INTERMAP study established standardized methods for dietary intake assessment across China, Japan, the UK, and the USA. Quality control measures ensured high-quality data on 76 nutrients, validating dietary assessment procedures.

Area of Science:

  • Nutritional Epidemiology
  • Public Health Nutrition
  • International Comparative Studies

Background:

  • Accurate dietary intake assessment is crucial for understanding population health.
  • Standardized international protocols are needed for reliable dietary data collection.
  • Previous dietary assessment methods lacked uniformity across diverse populations.

Purpose of the Study:

  • To describe the standardized procedures used in the International Monitoring of Trends and Determinants in Cardiovascular Disease (INTERMAP) study.
  • To assess dietary intake in 4680 individuals across population samples in China, Japan, the UK, and the USA.
  • To ensure the quality and comparability of collected dietary data for 76 nutrients.

Main Methods:

  • Utilized a common Protocol and Manuals of Operations for data collection.

Related Experiment Videos

  • Employed four 24-hour dietary recalls, two timed 24-hour urines, and 7-day alcohol histories per participant.
  • Implemented tape recording of interviews, central laboratory analysis of urines, and extensive food composition databases for nutrient computation.
  • Main Results:

    • Standardized procedures yielded high-quality dietary data across all four countries.
    • Correlations between urinary and dietary nutrient values (e.g., protein, potassium, sodium) indicated data validity.
    • Identified challenges in accurately assessing sodium intake using dietary methods.

    Conclusions:

    • The INTERMAP standardized procedures provide a valuable international resource for dietary assessment.
    • Quality control measures, including ongoing recoding and taped interviews, are essential for reliable data.
    • Further refinement of dietary assessment methods, particularly for sodium, is recommended.