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Table 3 Central ideas and corresponding proportion (%) of total key expressions for Group A in response to content questions about the reading assignment

From: Does knowledge of evolutionary biology change high school students’ attitudes about healthy eating?

Familiar content areas

 1. Carbohydrates come in different forms

44.0%

 2. Blood sugar refers to glucose

24.0%

 3. Foods that contain carbohydrates

12.0%

 4. The role of insulin

12.0%

 5. Relevance of carbohydrates to health

8.0%

Unfamiliar or new content areas

 1. Glucose can enter the bloodstream at different rates

45.5%

 2. The glycemic index as a metric

45.5%

 3. The role of insulin and the pancreas

9.0%