Springer Nature [academic journals on nature.com], International Journal of Obesity Supplements, S2(5), p. S22-S28, 2015
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Objective: The main aim of this study was to assess the reliability and validity of a food frequency questionnaire with 23 food groups (I-FFQ) among a sample of 9–11-year-old children from three different countries that differ on economical development and income distribution, and to assess differences between country sites. Furthermore, we assessed factors associated with I-FFQ’s performance.