Fig. 6.

Overview of the Nova classification process for NHANES. The boxes represent datasets, and the italicized text describes the action completed at each step by the program. ∗Food codes are disaggregated into SR codes at this step. More information of each step is described in the article. Food code, 8-digit food code from the USDA Food and Nutrient Database for Dietary Studies; SR code, standard reference code or ingredient code from the USDA National Nutrient Database for Standard Reference; FNDDS, USDA Food and Nutrient Database for Dietary Studies.