Prior to use, the questionnaire was reviewed for content validity by the study team. The display included 5 whole-grain and 6 refined-grain foods (whole-grain bread, whole-grain cereal, popcorn, oatmeal, whole-grain crackers, refined-grain cereal, refined-wheat bread, refined white flour tortilla, white rice, refined-grain crackers, and refined elbow macaroni). For this display, commonly consumed foods as part of the Dietary Guidelines for Americans (DGA) recommendations were chosen based on having either 100% whole-grain ingredients or 0% whole-grain ingredients. The whole-grain activity quantitative questionnaire involved the process of a participant viewing 11 grain foods in their original packaging on a nutrition display and determining if the food was a whole grain or not.
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