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Answer :
High reproducibility of a Food Frequency Questionnaire (FFQ) does not guarantee its validity.
Reproducibility refers to the consistency of results when the same tool is used repeatedly, indicating the stability of measurements over time. While important for reliability, reproducibility does not address whether the FFQ accurately captures the true dietary intake, which is the essence of validity. Validity requires assessing how well the FFQ measures what it intends to measure. This is typically done by comparing FFQ results with a reference method, such as food diaries or biomarkers, to determine the degree of agreement. Validity provides evidence of the FFQ's accuracy in capturing individuals' dietary habits. Therefore, while high reproducibility is a desirable quality, it must be accompanied by evidence of validity to ensure that the FFQ is a valid tool for assessing dietary intake.
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