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Validity and reproducibility of an adolescent Web-based food frequency questionnaire

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Abstract
Objective To assess the validity and reproducibility of a newly developed, cost-effective, and easy to administer, Web-based food frequency questionnaire (FFQ) for the dietary assessment of adolescents. Design Cross-sectional validation of a Web-based FFQ, which contained 15 food groups (water; soft drinks, including fruit juice and diet soft drinks; alcoholic beverages; soup; milk and milk products; fruit; sweet and savory snacks/fillings; sauces and fat spreads; breakfast cereals; bread; cheese, fish/eggs/meat; pasta/rice; vegetables; and potatoes). Reference data for validation were 3-day estimated food records. Analyses were done for all participants and for consumers only (consumer in both Web-based FFQ and food record). Subjects/setting A selected group of adolescents (12 to 18 years of age, n = 104) from participating secondary schools in Ghent, Belgium. Results For all participants, the measured intakes of water, fruit, breakfast cereals, fish/eggs/meat, pasta/rice, and potatoes were not significantly different between the two methods. The Spearman correlation for all foods was on average 0.38 (ranging from 0.20 for pasta/rice to 0.64 for breakfast cereals). When analyzed for consumers only, the Web-based FFQ showed significantly lower estimates for soft drinks, sweet and savory snacks/fillings, sauces and fat spreads, cheese, pasta/rice, and vegetables. The average Spearman correlation for all foods collectively was 0.30. When reproducibility of the Web-based FFQ was assessed, the average Spearman correlation coefficient for all foods collectively was 0.62. Conclusions Most questions on the 15 food groups had acceptable reproducibility, whereas validation only showed reliable intakes for water, fruit, bread, and fish/eggs/meat. This Web-based FFQ could be a start for development of dietary assessment methods in public health nutrition contexts.
Keywords
PORTION SIZE, VALIDATION, PHOTOGRAPHY, CHILDREN, ENERGY, FRUIT

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MLA
Matthys, Christophe, Ilse Pynaert, Willem De Keyzer, et al. “Validity and Reproducibility of an Adolescent Web-based Food Frequency Questionnaire.” JOURNAL OF THE AMERICAN DIETETIC ASSOCIATION 107.4 (2007): 605–610. Print.
APA
Matthys, Christophe, Pynaert, I., De Keyzer, W., & De Henauw, S. (2007). Validity and reproducibility of an adolescent Web-based food frequency questionnaire. JOURNAL OF THE AMERICAN DIETETIC ASSOCIATION, 107(4), 605–610.
Chicago author-date
Matthys, Christophe, Ilse Pynaert, Willem De Keyzer, and Stefaan De Henauw. 2007. “Validity and Reproducibility of an Adolescent Web-based Food Frequency Questionnaire.” Journal of the American Dietetic Association 107 (4): 605–610.
Chicago author-date (all authors)
Matthys, Christophe, Ilse Pynaert, Willem De Keyzer, and Stefaan De Henauw. 2007. “Validity and Reproducibility of an Adolescent Web-based Food Frequency Questionnaire.” Journal of the American Dietetic Association 107 (4): 605–610.
Vancouver
1.
Matthys C, Pynaert I, De Keyzer W, De Henauw S. Validity and reproducibility of an adolescent Web-based food frequency questionnaire. JOURNAL OF THE AMERICAN DIETETIC ASSOCIATION. 2007;107(4):605–10.
IEEE
[1]
C. Matthys, I. Pynaert, W. De Keyzer, and S. De Henauw, “Validity and reproducibility of an adolescent Web-based food frequency questionnaire,” JOURNAL OF THE AMERICAN DIETETIC ASSOCIATION, vol. 107, no. 4, pp. 605–610, 2007.
@article{368546,
  abstract     = {Objective To assess the validity and reproducibility of a newly developed, cost-effective, and easy to administer, Web-based food frequency questionnaire (FFQ) for the dietary assessment of adolescents.
Design Cross-sectional validation of a Web-based FFQ, which contained 15 food groups (water; soft drinks, including fruit juice and diet soft drinks; alcoholic beverages; soup; milk and milk products; fruit; sweet and savory snacks/fillings; sauces and fat spreads; breakfast cereals; bread; cheese, fish/eggs/meat; pasta/rice; vegetables; and potatoes). Reference data for validation were 3-day estimated food records. Analyses were done for all participants and for consumers only (consumer in both Web-based FFQ and food record).
Subjects/setting A selected group of adolescents (12 to 18 years of age, n = 104) from participating secondary schools in Ghent, Belgium.
Results For all participants, the measured intakes of water, fruit, breakfast cereals, fish/eggs/meat, pasta/rice, and potatoes were not significantly different between the two methods. The Spearman correlation for all foods was on average 0.38 (ranging from 0.20 for pasta/rice to 0.64 for breakfast cereals). When analyzed for consumers only, the Web-based FFQ showed significantly lower estimates for soft drinks, sweet and savory snacks/fillings, sauces and fat spreads, cheese, pasta/rice, and vegetables. The average Spearman correlation for all foods collectively was 0.30. When reproducibility of the Web-based FFQ was assessed, the average Spearman correlation coefficient for all foods collectively was 0.62.
Conclusions Most questions on the 15 food groups had acceptable reproducibility, whereas validation only showed reliable intakes for water, fruit, bread, and fish/eggs/meat. This Web-based FFQ could be a start for development of dietary assessment methods in public health nutrition contexts.},
  author       = {Matthys, Christophe and Pynaert, Ilse and De Keyzer, Willem and De Henauw, Stefaan},
  issn         = {0002-8223},
  journal      = {JOURNAL OF THE AMERICAN DIETETIC ASSOCIATION},
  keywords     = {PORTION SIZE,VALIDATION,PHOTOGRAPHY,CHILDREN,ENERGY,FRUIT},
  language     = {eng},
  number       = {4},
  pages        = {605--610},
  title        = {Validity and reproducibility of an adolescent Web-based food frequency questionnaire},
  url          = {http://dx.doi.org/10.1016/j.jada.2007.01.005},
  volume       = {107},
  year         = {2007},
}

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