A simple aggregate of calories sold as captured in Scantrack will underestimate national sales because the sample does not include Walmart, club stores, convenience, and smaller stores that can represent a substantial proportion of sales.32 Using nationally representative Homescan data for the same years, food category– and brand outlet–specific proportions of purchases from stores that are not included in the Scantrack sales projections were estimated to adjust Scantrack and more fully capture calories sold
The adjusted 2007 and 2012 Scantrack estimates provide the basis for total caloric shares of HWCF products sold compared to non- HWCF and PL products in this evaluation. The results are presented both in terms of absolute values for the total U.S., as well as by per capita per day in order to account for population changes and allow for interpretability