Reproducibility and validity of diet quality scores derived from food-frequency questionnaires

Diet quality scores (DQSs) are frequently used to study diet–disease relations but the validity of these scores derived from FFQs has rarely been evaluated. To evaluate the validity and reproducibility of 6 commonly used DQSs derived from the FFQ, including the Alternate Healthy Eating Index–2010, Dietary Approaches to Stop Hypertension Trial score, alternative Mediterranean diet score, and 3 plant-based diet indices (overall, healthful, and...