Development and Validation of a Self-Administered Semiquantitative Food Frequency Questionnaire Focused on Gut Microbiota: The Stance4Health-FFQ.

Comparison of Different Food Groups’ Frequency Consumption Derived from the Two FFQs Based on Bland–Altman graphs in Figure 2 , a decreasing trend was observed in most of the graphs, which could indicate a proportional error, i.e., positive differences for small values, and vice versa, negative differences for large values.

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