TABLE 2.

Spearman's correlation coefficients between energy density of foods (kcal/100 g) and different price measures based on the Food and Nutrient Database for Dietary Studies (FNDDS 1.0) and the linked Center for Nutrition Policy and Promotion food prices database¹

		Food price measures
Major FNDDS food groups	No. of foods	Unit price	Serving price	Energy cost
		$/100 g	$/serving	$/100 kcal
Milk and milk products	134	0.762	−0.03	0.00
Meat, poultry, and fish	196	0.13	−0.152	−0.562
Eggs	8	0.48	0.38	−0.33
Dry beans, legumes, nuts, and seeds	62	0.652	−0.13	−0.25
Grain products	435	0.492	−0.08	−0.01
Fruit	93	0.10	−0.09	−0.552
Vegetables	257	0.00	−0.05	−0.752
Fats, oils, and salad dressings	51	−0.07	−0.27	−0.772
Sugars, sweets, and beverages	151	0.792	0.05	−0.432
Total foods	1387	—	—	—

¹Data are from references 9 and 10. Analyses are based on 1387 foods from 9 major food groups as defined by the US Department of Agriculture.

²P < 0.05.