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Nutrients 2017, 9(11), 1257; doi:10.3390/nu9111257

Validity and Reproducibility of a Food Frequency Questionnaire for Dietary Factors Related to Colorectal Cancer

1
Department of Food Safety and Food Quality, Ghent University, Coupure Link 653, 9000 Ghent, Belgium
2
Department of Public Health, College of Health Sciences, Mekelle University, Mekelle 1871, Ethiopia
3
International Agency for Research on Cancer (IARC), 150 Cours Albert Thomas, 69372 Lyon CEDEX 08, France
4
Poverty, Health and Nutrition Division, International Food Policy Research Institute, 2033 K Street NW, Washington, DC 20006, USA
5
Scientific Institute of Public Health, J. Wytsmanstraat 14, 1050 Brussels, Belgium
6
Laboratory of Animal Nutrition and Animal Product Quality, Ghent University, Coupure Links 653, 9000 Ghent, Belgium
7
Laboratory of Chemical Analysis, Department of Veterinary Public Health and Food Safety, Ghent University, Salisburylaan 133, 9820 Merelbeke, Belgium
8
Department of Oncology, Antwerp University Hospital, Wilrijkstraat 10, 2650 Edegem, Belgium
*
Author to whom correspondence should be addressed.
Received: 29 September 2017 / Revised: 8 November 2017 / Accepted: 10 November 2017 / Published: 17 November 2017
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Abstract

Dietary factors play a major role in the development of colorectal cancer. This study evaluated the reproducibility and validity of a 109-food item Food Frequency Questionnaire (FFQ) to measure the consumption of foods and nutrients related to the development of colorectal cancer in a population aged ≥50 years in Flanders, Belgium. A semi-quantitative FFQ was administered two times in a period of two weeks to evaluate reproducibility (FFQ1 and FFQ2). The validity of the FFQ was assessed by comparing FFQ1 against the 3-day diary method (3 DD). A total of 162 respondents (mean age 57.5 years) provided data for the FFQ, of whom 156 also participated in the validity assessment. Mean differences in the intake of foods and nutrients between FFQ1 and FFQ2 were, overall, small and statistically insignificant. However, a higher estimation was observed by FFQ1 as compared to the 3-DD method for the majority of food groups and nutrient intake in the validity assessment. A systematic mean difference (g/day) was observed for eight food groups in the Bland–Altman agreement test; the largest was for fruit intake. Regarding the nutrients, a systematic mean difference was observed in calcium, fat, and vitamin D intake. Overall, the reproducibility of the FFQ was good, and its validity could be satisfactory for estimating absolute food and nutrient intakes and ranking individuals according to high and low intake categories. View Full-Text
Keywords: reproducibility; validity; FFQ’s; food diary; colorectal cancer reproducibility; validity; FFQ’s; food diary; colorectal cancer
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MDPI and ACS Style

Tollosa, D.N.; Van Camp, J.; Huybrechts, I.; Huybregts, L.; Van Loco, J.; De Smet, S.; Sterck, E.; Rabâi, C.; Van Hecke, T.; Vanhaecke, L.; Vossen, E.; Peeters, M.; Lachat, C. Validity and Reproducibility of a Food Frequency Questionnaire for Dietary Factors Related to Colorectal Cancer. Nutrients 2017, 9, 1257.

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