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2019•NutritionOpen access

Reproducibility and relative validity of a semiquantitative food frequency questionnaire in European preschoolers: The ToyBox study

Theodora Mouratidou, María Isabel Mesana Graffe, Inge Huybrechts, Ellen De Decker, Marieke De Craemer, Odysseas Androutsos, Yannis Μanios, Sonya Galcheva, Mina Lateva, Beata Gurzkowska, Zbigniew Kułaga, J. Birnbaum, Berthold Koletzko, Luís A. Moreno

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Key concepts: Reproducibility, Spearman's rank correlation coefficient, Food frequency questionnaire, Quartile, Food group, Rank correlation, Pearson product-moment correlation coefficient, Correlation

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