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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 forms44.0%
 2. Blood sugar refers to glucose24.0%
 3. Foods that contain carbohydrates12.0%
 4. The role of insulin12.0%
 5. Relevance of carbohydrates to health8.0%
Unfamiliar or new content areas
 1. Glucose can enter the bloodstream at different rates45.5%
 2. The glycemic index as a metric45.5%
 3. The role of insulin and the pancreas9.0%