@Article{info:doi/10.2196/jmir.2965,
author="Christensen, Sara E
and M{\"o}ller, Elisabeth
and Bonn, Stephanie E
and Ploner, Alexander
and B{\"a}lter, Olle
and Lissner, Lauren
and B{\"a}lter, Katarina",
title="Relative Validity of Micronutrient and Fiber Intake Assessed With Two New Interactive Meal- and Web-Based Food Frequency Questionnaires",
journal="J Med Internet Res",
year="2014",
month="Feb",
day="21",
volume="16",
number="2",
pages="e59",
keywords="validity; reproducibility; FFQ; micronutrients; weighed food record; Internet; adult",
abstract="Background: The meal- and Web-based food frequency questionnaires, Meal-Q and MiniMeal-Q, were developed for cost-efficient assessment of dietary intake in epidemiological studies. Objective: The objective of this study was to evaluate the relative validity of micronutrient and fiber intake assessed with Meal-Q and MiniMeal-Q. The reproducibility of Meal-Q was also evaluated. Methods: A total of 163 volunteer men and women aged between 20 and 63 years were recruited from Stockholm County, Sweden. Assessment of micronutrient and fiber intake with the 174-item Meal-Q was compared to a Web-based 7-day weighed food record (WFR). Two administered Meal-Q questionnaires were compared for reproducibility. The 126-item MiniMeal-Q, developed after the validation study, was evaluated in a simulated validation by using truncated Meal-Q data. Results: The study population consisted of approximately 80{\%} women (129/163) with a mean age of 33 years (SD 12) who were highly educated (130/163, 80{\%} with >12 years of education) on average. Cross-classification of quartiles with the WFR placed 69{\%} to 90{\%} in the same/adjacent quartile for Meal-Q and 67{\%} to 89{\%} for MiniMeal-Q. Bland-Altman plots with the WFR and the questionnaires showed large variances and a trend of increasing underestimation with increasing intakes. Deattenuated and energy-adjusted Spearman rank correlations between the questionnaires and the WFR were in the range $\rho$=.25-.69, excluding sodium that was not statistically significant. Cross-classifications of quartiles of the 2 Meal-Q administrations placed 86{\%} to 97{\%} in the same/adjacent quartile. Intraclass correlation coefficients for energy-adjusted intakes were in the range of .50-.76. Conclusions: With the exception of sodium, this validation study demonstrates Meal-Q and MiniMeal-Q to be useful methods for ranking micronutrient and fiber intake in epidemiological studies with Web-based data collection. ",
issn="14388871",
doi="10.2196/jmir.2965",
url="http://www.jmir.org/2014/2/e59/",
url="https://doi.org/10.2196/jmir.2965",
url="http://www.ncbi.nlm.nih.gov/pubmed/24565605"
}