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Validity and reproducibility of an interviewer-administered food frequency questionnaire for healthy French-Canadian men and women

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Author(s): Goulet Julie | Nadeau Geneviève | Lapointe Annie | Lamarche Benoît | Lemieux Simone

Journal: Nutrition Journal
ISSN 1475-2891

Volume: 3;
Issue: 1;
Start page: 13;
Date: 2004;
Original page

Keywords: Food frequency questionnaire | validation | reproducibility | 3-day food record

ABSTRACT
Abstract Objective To evaluate the validity (study 1) and the reproducibility (study 2) of an interviewer-administered food frequency questionnaire (FFQ). Method The FFQ was designed at Laval University and contains 91 items and 33 subquestions. Study 1: The FFQ was compared against a 3-day food record (2 week-days and 1 weekend-day), at week 0, 6 and 12 of a nutritional intervention. Study 2: In order to evaluate the reproducibility of the FFQ, 2 registered dietitians administered the FFQ 4-weeks apart among subjects who were not part of the nutritional intervention. Results Study 1: Mean values for intake of most nutrients assessed by the FFQ and by the 3-day food record were not statistically different. Energy-adjusted correlation coefficients for major macronutrients ranged from 0.36 for proteins to 0.60 for carbohydrates (p ≤ 0.01). Agreement analysis revealed that on average, 35% of the subjects were classified in the same quartile when nutrients were assessed by either the 3-day food record or the FFQ. Study 2: Significant associations were observed between dietary measurements derived from the two FFQs administered 4 weeks apart. Correlation coefficients for the reproducibility of macronutrients ranged from 0.66 for carbohydrates to 0.83 for lipids after energy adjustment. On average, 46% of the subjects were classified in the same quartile when nutrient intakes were assessed by either FFQ. Conclusion These data indicated that the FFQ developed has a good validity and is reproducible.
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