Table 2.

Energy Sources Named by Knowledge Groups and Grades

	Low (n=96) n^a / %	Medium (n=105) n / %	High (n=90) n / %	Subtotal
Foods ^b	53 / 55.21	66 / 62.86	69 / 76.67	188
Water and beverages	32 / 33.33	32 / 30.47	20 / 22.22	84
Oxygen, air & breathing	14 / 14.58	17 / 16.19	9 / 10.00	40
Body parts and/or organs	15 / 15.63	16 / 15.24	12 / 13.33	43
Exercise and/or training	17/ 17.71	18 / 17.14	5 / 5.56	40
Sleeping, taking breaks and/or other sedentary activities	8 / 8.33	8 / 7.62	8/ 8.89	24

	6^th (n=108) n / %	7^th (n=92) n / %	8^th (n=91) n / %	Subtotal

Foods ^b	58 / 53.70	58 / 63.04	72 / 78.02	188
Water and beverages	30 / 27.78	27 / 29.35	27 / 29.67	84
Oxygen, air & breathing	13 / 12.04	13 / 14.13	14 / 15.38	40
Body parts and/or organs	22 / 20.37	13 / 14.13	8 / 8.79	43
Exercise and/or training	17 / 15.74	14 / 15.21	9 / 9.89	40
Sleeping, taking breaks, and/or other sedentary activities	10 / 9.26	6 / 6.52	8 / 8.79	24

n represents cumulative frequencies by energy source types. For example, a student could be tallied three times when s/he named food, water, and heart as energy sources.

Foods include general response “food/s,” specific items such as “bread,” and nutrient groups such as “carbohydrates,” “fats,” and “protein.”