Estimation of the Distribution of Usual Intakes for Selected Dietary Components
介绍如何利用美国农业部膳食调查数据，估计人群中某些膳食成分摄入不足或过量的比例，强调需基于长期常规摄入量而非单日数据来判断营养缺乏风险。
The U.S. Department of Agriculture (USDA) has been responsible for conducting periodic surveys to estimate food consumption patterns of households and/or individuals in the United States for over 50 years. Data from these surveys have had a significant impact on the formulation of food-assistance programs, on consumer education and on food regulatory activities.\nIn recent years, there has been interest in estimating the proportion of the population that has insufficient intake or excessive intake of certain dietary components. Different approaches have been suggested for the estimation of this proportion. In all approaches, it is necessary to analyze data on dietary intakes for a sample of individuals. Also, all approaches recognize that an individual who has a low intake of a given dietary component on one day is not necessarily deficient (or at risk of being deficient) so far as that dietary component is concerned. It is low intake over a sufficiently long period of time that produces a dietary deficiency. A dietary deficiency exists when the "usual" (i.e., normal or long-run average) intake of the dietary component is less than the appropriate dietary standard.