Table 2. Combinations of methodological assumptions used to estimate the percentage of the theoretical requirement for zinc available in the national food supply1.
| Nutrient Database | Zn requirements | Zn availability in food supply |
| Composite | IZiNCG Physiological | Absorbable zinc (Miller equation) |
| IML | IZiNCG Physiological | Absorbable zinc (Miller equation) |
| NDSR | IZiNCG Physiological | Absorbable zinc (Miller equation) |
| Composite | FNB/IOM Physiological | Absorbable zinc (Miller equation) |
| Composite | IZiNCG Dietary | Total dietary zinc |
| Composite | FNB/IOM Dietary | Total dietary zinc |
1
IML, WorldFood System International Mini-list; NDSR, Nutrition Data System for Research; IZiNCG, International Zinc Nutrition Consultative Group; FNB/IOM, Food and Nutrition Board of the Institute of Medicine.