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Int. J. Environ. Res. Public Health 2009, 6(1), 121-150; doi:10.3390/ijerph6010121
Article

Validity and Reproducibility of a Self-Administered Semi-Quantitative Food-Frequency Questionnaire for Estimating Usual Daily Fat, Fibre, Alcohol, Caffeine and Theobromine Intakes among Belgian Post-Menopausal Women

1
, 2
, 3
, 2,3
 and 1,*
1 Laboratory of Microbial Ecology and Technology (LabMET), Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium 2 Department of Public Health, Ghent University, University Hospital 2BlokA, De Pintelaan 185, B-9000 Ghent, Belgium 3 Department of Nutrition and Dietetics, Faculty of Health Care Vesalius, University College Ghent, Keramiekstraat 80, B-9000 Ghent, Belgium
* Author to whom correspondence should be addressed.
Received: 11 December 2008 / Accepted: 31 December 2008 / Published: 6 January 2009
(This article belongs to the Special Issue Public Health: Feature Papers)
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Abstract

A novel food-frequency questionnaire (FFQ) was developed and validated to assess the usual daily fat, saturated, mono-unsaturated and poly-unsaturated fatty acid, fibre, alcohol, caffeine, and theobromine intakes among Belgian post-menopausal women participating in dietary intervention trials with phyto-oestrogens. The relative validity of the FFQ was estimated by comparison with 7 day (d) estimated diet records (EDR, n 64) and its reproducibility was evaluated by repeated administrations 6 weeks apart (n 79). Although the questionnaire underestimated significantly all intakes compared to the 7 d EDR, it had a good ranking ability (r 0.47-0.94; weighted κ 0.25-0.66) and it could reliably distinguish extreme intakes for all the estimated nutrients, except for saturated fatty acids. Furthermore, the correlation between repeated administrations was high (r 0.71-0.87) with a maximal misclassification of 7% (weighted κ 0.33-0.80). In conclusion, these results compare favourably with those reported by others and indicate that the FFQ is a satisfactorily reliable and valid instrument for ranking individuals within this study population.
Keywords: Food-frequency questionnaire; estimated diet record; validity; reproducibility; fat; fibre Food-frequency questionnaire; estimated diet record; validity; reproducibility; fat; fibre
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Bolca, S.; Huybrechts, I.; Verschraegen, M.; De Henauw, S.; Van de Wiele, T. Validity and Reproducibility of a Self-Administered Semi-Quantitative Food-Frequency Questionnaire for Estimating Usual Daily Fat, Fibre, Alcohol, Caffeine and Theobromine Intakes among Belgian Post-Menopausal Women. Int. J. Environ. Res. Public Health 2009, 6, 121-150.

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