Comparison of a Web-Based Frequency Questionnaire for Assessment of Beverage Intake with a Validated 7-Day Web-Diary from Danish Teenagers.
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Date
2014-10
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Abstract
Aims: To compare beverage intake measured using a web-based quantitative beverage
frequency questionnaire (BFQ) with a 7-day estimated beverage diary (WebDAS), and to
evaluate the BFQ’s feasibility.
Study Design: Cross-sectional comparison of the BFQ, which contained 37 beverage
types including energy drinks and caffeinated beverages, with the WebDAS.
Place and Duration of Study: Sample: Three 9th grade local authority school classes
totalling 73 14-16-year-old students from a suburban area in Copenhagen were recruited.
The study was carried out between September 2013 and November 2013.
Methodology: First respondents completed the WebDAS at home, and after 2 weeks
they completed the BFQ at school. McNemar’s test, the Wilcoxon signed rank test,
Spearman’s rank correlation coefficients, a Bland-Altman plot, weighted Kappa statistics
and percentages of exact agreement were used to compare the results of the two
methods. Results: 49 (29 boys; 20 girls) had acceptable data from both the WebDAS, and the BFQ.
The mean total beverage intake measured by the two methods differed significantly (BFQ:
1566 vs. WebDAS: 1231g/day, P<.01). The Spearman rank correlations were positive
(r=.41-75) for all beverages including energy drinks, and significant for most beverages.
Significant agreement for the numbers of consumers was observed between methods,
except for soft drinks and chocolate. The mean (SD) difference was 335 (769)g/day,
primarily due to an intake of water measured with BFQ almost twice as high as that
measured with WebDAS. This was reflected in the Bland-Altman plot and in the
percentages of exact agreement, which were lower for water than for other beverages
(29% vs. 39-46%).
Conclusion: The BFQ gave results comparable to a 7-day beverage diary (WebDAS) in
14-16-year-olds. With a few adjustments, especially with regard to portion sizes and
entries for water, we believe the BFQ will be useful in large population-based studies for
assessment of beverage intake.
Description
Keywords
Beverage assessment, dietary assessment, energy drink, food frequency questionnaire, reporting accuracy, relative validation.
Citation
Biltoft-Jensen Anja, Iversen Jeppe Decker, Christensen Lene Møller, Matthiessen Jeppe. Comparison of a Web-Based Frequency Questionnaire for Assessment of Beverage Intake with a Validated 7-Day Web-Diary from Danish Teenagers. European Journal of Nutrition & Food Safety. 2014 Oct-Dec; 4(4): 577-591.