. "Appendix E: Units of Observation: Assessing Nutrient Adequacy Using Household and Population Data." Dietary Reference Intakes: Applications in Dietary Assessment. Washington, DC: The National Academies Press, 2000.
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DRI DIETARY REFERENCE INTAKES: Applications in Dietary Assessment
In theory, then, an assessment of nutrient supply can be made with the population as the unit of observation but it would require very careful thought in building an estimate of the appropriate reference population requirement.