Validity and reproducibility of the food frequency questionnaire used in the Shanghai Women's Health Study

Xiao Ou Shu, G. Yang, F. Jin, D. Liu, L. Kushi, W. Wen, Y. T. Gao, W. Zheng

Research output: Contribution to journalArticle

264 Citations (Scopus)

Abstract

To evaluate the validity and reliability of the food frequency questionnaire (FFQ) used in the Shanghai Women's Health Study (SWHS), 200 SWHS participants were recruited for a dietary calibration study. Study participants completed an FFQ at baseline and 24-h dietary recalls (24-HDR) twice per month consecutively for 12 months. At the end of the study, a second FFQ was administered. Of the 200 study participants, 196 completed 24 or more days of 24-h dietary recalls, 191 completed two FFQs from whom the results of this report were based. The FFQ included the foods that accounted for 86% of the foods recorded in the 24-HDR surveys. Validity of the FFQ was evaluated by comparing intake levels of major nutrients and foods obtained from the second FFQ with those derived from the multiple 24-HDR. The median intake for major nutrients, rice, poultry and meat derived from the second FFQ and the 24-HDR was similar, with the differences ranging from 1.3 to 12.1%. The FFQ tended to overestimate the intake level of total vegetables and total fruits, and the differences were explained mainly by over-reporting seasonal vegetables and fruits consumption in the FFQ. Nutrient and food intake assessed by the FFQ and the multiple 24-HDR correlated very well, with the correlation coefficients being 0.59-0.66 for macronutrients, 0.41-0.59 for micronutrients, and 0.41-0.66 for major food groups. The reliability of the FFQ was assessed by comparing the correlation and median intake of nutrients and food groups obtained from the two FFQs that were administered approximately 2y apart. The median intake levels for selected nutrients and food groups derived from the two FFQs were similar with differences below 10%. At the individual level, the intake levels of these dietary variables obtained from two FFQs also correlated well. When nutrient and food group intakes were categorized into quartiles, FFQ and 24-HDR produced exact agreement rates between 33 and 50%. Misclassification to adjacent quartile was common, ranging from 34-48%, while misclassification to an extreme quartile was rare (1-6%). These data indicate that the SWHS FFQ can reliably and accurately measure usual intake of major nutrients and food groups among women in Shanghai.

Original languageEnglish (US)
Pages (from-to)17-23
Number of pages7
JournalEuropean Journal of Clinical Nutrition
Volume58
Issue number1
DOIs
StatePublished - Jan 2004
Externally publishedYes

Fingerprint

women's health
food frequency questionnaires
Women's Health
reproducibility
Food
diet recall
China
food groups
nutrients
nutrient intake
Surveys and Questionnaires
Eating
vegetable consumption
fruit consumption
dietary minerals
Vegetables

Keywords

  • FFQ
  • Reliability
  • SWHS
  • Validity

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Food Science

Cite this

Validity and reproducibility of the food frequency questionnaire used in the Shanghai Women's Health Study. / Shu, Xiao Ou; Yang, G.; Jin, F.; Liu, D.; Kushi, L.; Wen, W.; Gao, Y. T.; Zheng, W.

In: European Journal of Clinical Nutrition, Vol. 58, No. 1, 01.2004, p. 17-23.

Research output: Contribution to journalArticle

Shu, Xiao Ou ; Yang, G. ; Jin, F. ; Liu, D. ; Kushi, L. ; Wen, W. ; Gao, Y. T. ; Zheng, W. / Validity and reproducibility of the food frequency questionnaire used in the Shanghai Women's Health Study. In: European Journal of Clinical Nutrition. 2004 ; Vol. 58, No. 1. pp. 17-23.
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N2 - To evaluate the validity and reliability of the food frequency questionnaire (FFQ) used in the Shanghai Women's Health Study (SWHS), 200 SWHS participants were recruited for a dietary calibration study. Study participants completed an FFQ at baseline and 24-h dietary recalls (24-HDR) twice per month consecutively for 12 months. At the end of the study, a second FFQ was administered. Of the 200 study participants, 196 completed 24 or more days of 24-h dietary recalls, 191 completed two FFQs from whom the results of this report were based. The FFQ included the foods that accounted for 86% of the foods recorded in the 24-HDR surveys. Validity of the FFQ was evaluated by comparing intake levels of major nutrients and foods obtained from the second FFQ with those derived from the multiple 24-HDR. The median intake for major nutrients, rice, poultry and meat derived from the second FFQ and the 24-HDR was similar, with the differences ranging from 1.3 to 12.1%. The FFQ tended to overestimate the intake level of total vegetables and total fruits, and the differences were explained mainly by over-reporting seasonal vegetables and fruits consumption in the FFQ. Nutrient and food intake assessed by the FFQ and the multiple 24-HDR correlated very well, with the correlation coefficients being 0.59-0.66 for macronutrients, 0.41-0.59 for micronutrients, and 0.41-0.66 for major food groups. The reliability of the FFQ was assessed by comparing the correlation and median intake of nutrients and food groups obtained from the two FFQs that were administered approximately 2y apart. The median intake levels for selected nutrients and food groups derived from the two FFQs were similar with differences below 10%. At the individual level, the intake levels of these dietary variables obtained from two FFQs also correlated well. When nutrient and food group intakes were categorized into quartiles, FFQ and 24-HDR produced exact agreement rates between 33 and 50%. Misclassification to adjacent quartile was common, ranging from 34-48%, while misclassification to an extreme quartile was rare (1-6%). These data indicate that the SWHS FFQ can reliably and accurately measure usual intake of major nutrients and food groups among women in Shanghai.

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