Reproducibility and validity of an expanded self-administered semiquantitative food frequency questionnaire among male health professionals

Eric B. Rimm, Edward L. Giovannucci, Meir J. Stampfer, Graham A. Colditz, Lisa B. Litin, Walter C. Willett

Research output: Contribution to journalArticle

1554 Scopus citations

Abstract

The authors assessed the reproducibility and validity of an expanded 131-item semiquantitative food frequency questionnaire used in a prospective study among 51, 529 men. The form was administered by mail twice to a sample of 127 participants at a one-year interval. During this interval, men completed two one-week diet records spaced approximately 6 months apart. Mean values for intake of most nutrients assessed by the two methods were similar. Intraclass correlation coefficients for nutrient intakes assessed by questionnaires one year apart ranged from 0.47 for vitamin E without supplements to 0.80 for vitamin C with supplements. Correlation coefficients between the energy-adjusted nutrient intakes measured by diet records and the second questionnaire (which asked about diet during the year encompassing the diet records) ranged from 0.28 for iron without supplements to 0.86 for vitamin C with supplements (mean r = 0.59). These correlations were higher after adjusting for week-to-week variation in diet record intakes (mean r = 0.65). These data indicate that the expanded semiquantitative food frequency questionnaire is reproducible and provides a useful measure of intake for many nutrients over a one-year period. Am J Epidemiol 1992; 135: 1114-26.

Original languageEnglish
Pages (from-to)1114-1126
Number of pages13
JournalAmerican journal of epidemiology
Volume135
Issue number10
DOIs
StatePublished - May 15 1992
Externally publishedYes

Keywords

  • Diet
  • Epidemiologic methods
  • Food
  • Nutrition
  • Nutrition surveys
  • Questionnaires

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