TY - JOUR AU - Barrat , Emmanuel AU - Aubineau , Nicolas AU - Maillot , Matthieu AU - Derbord , Élodie AU - Barthes , Pauline AU - Lescuyer , Jean-François AU - Boisseau , Nathalie AU - Peltier , Sébastien L. PY - 2012/10/30 Y2 - 2024/03/28 TI - Repeatability and relative validity of a quantitative food-frequency questionnaire among French adults JF - Food & Nutrition Research JA - fnr VL - 0 IS - 0 SE - Original Articles DO - 10.3402/fnr.v56i0.18472 UR - https://foodandnutritionresearch.net/index.php/fnr/article/view/472 SP - AB - Background: A 50-item self-administered food frequency questionnaire (FFQ) was developed for Frenchadults, to assess the intake of energy, 10 macronutrients, 11 vitamins, and 11 minerals, and to be used in thecontext of a medical consultation.Objective: To assess the repeatability and relative validity of this FFQ compared to a 7-day diet record(7-DR).Design: A total of 54 and 100 French adults were included in the repeatability and validation studies,respectively. Repeatability was assessed using two FFQs, the second carried out 3 weeks after the first. In thevalidation study, subjects first completed the FFQ, then the 7-DR the following week. Energy and nutrientintakes were compared using Pearson correlation. The degree of misclassification by the FFQ, compared tothe 7-DR, was calculated by a contingency table of quintiles. BlandAltman plots assessed the correlationbetween FFQ and 7-DR across the intake range.Results: Repeatability for intake, explored by Pearson correlation, was 0.620.90 (median: 0.81). Relativevalidity, as determined by Pearson correlation for the nutrient intake derived from the FFQ and 7-DR, was0.360.80 (0.64). The FFQ tended to report higher fiber and micronutrient intake than 7-DR. Misclassificationinto opposite quintiles ranged 06% (1%), whereas classification into same or adjacent quintiles ranged5983% (74%). BlandAltman plots showed good agreement for most nutrients across the range of intake.Conclusion: This new FFQ showed a high repeatability and good relative validity, and thanks to its shortlength, should be a useful tool for rapidly evaluating the nutrient intake of French adults.Keywords: nutrient intake; diet record; relative validation; adult; France(Published: 30 October 2012)Citation: Food & Nutrition Research 2012. 56: 18472 - http://dx.doi.org/10.3402/fnr.v56i0.18472 ER -