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    Validity and reproducibility of food frequency questionnaire to asses lipid and phytochemical intake. by Perovic, N.R., Defagó, M.D., Aguinaldo, A., Joekes, S., Actis, A.B.

    Published 2017
    “…The mid intake of FFQ1-FFQ2, the 24HDR-FFQ2 median intake, median difference, Mean Absolute Deviation from the median differences (MAD), Wilcoxon signed rank sum test and Spearman rank order correlation coefficients were calculated to analyze the accuracy of the FFQ data. …”
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