Why are the grains in ounce equivalents columns blank?

The USDA Food Pattern Equivalent grain variables (total, whole, and refined grains) will not be calculated for data collected from versions prior to NDSR 2013. If older data are rerun, the grain per ounce equivalent categories will be in the output files, but data will be missing or blank for these variables. See “The USDA Food Patterns Equivalents Grain Variables” in Appendix 10, Food Grouping” for more information on equivalent grain variables.