Development of an approach for estimating usual nutrient intake distributions at the population level
Development of an approach for estimating usual nutrient intake distributions at the population level
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DOI：
10.1093/jn/127.6.1106
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发表时间：
1997-06-01
影响因子：
4.2
通讯作者：
Carriquiry, AL
中科院分区：
文献类型：
--
作者：
Guenther, PM;Kott, PS;Carriquiry, AL
对人口膳食摄入量的评估必须考虑每日摄入量的巨大个体差异。美国农业部（USDA）委托国家科学院（NAS）于1986年发布的一份报告标志着这一问题历史上的一个重要里程碑。从那时起，美国农业部一直与爱荷华州州立大学（ISU）的统计学家合作，他们进一步发展了NAS提出的测量误差模型方法。ISU统计学家开发的方法可用于估计人群的日常饮食摄入量分布，但不能用于特定个体。它是基于这样的假设，即一个人可以更准确地回忆和描述昨天吃的食物，而不是更早的时候吃的食物。该方法需要少至两个独立天的营养摄入信息或至少一个子样本的个人连续三天。它消除了随后报告日与第一天相比的偏差，并且可以很容易地消除诸如星期几和季节性影响等时间影响。ISU开发的方法在概念上进行了描述，并应用于1989-91年美国农业部个人食物摄入量持续调查中收集的数据，以估计20岁及以上的男性和女性的比例，（长期平均）从脂肪中摄入的能量低于30%，低于1989年推荐的维生素A和叶酸膳食摄入量，叶酸在1000 μ g以上。这些结果进行了比较，从1-D的摄入量和3-D的平均摄入量的分布的结果，以证明在人口中的人内的变化和不对称的影响，通常的营养素摄入量。
Assessment of the dietary intake of a population must consider the large within-person variation in daily intakes. A 1986 report by the National Academy of Sciences (NAS), commissioned by the U.S. Department of Agriculture (USDA), marked an important milestone in the history of this issue. Since that time, USDA has been working cooperatively with statisticians at Iowa State University (ISU), who have further developed the measurement error model approach proposed by NAS. The method developed by the ISU statisticians Can be used to estimate usual dietary intake distributions for a population but not for specific individuals. It is based on the assumption that an individual can more accurately recall and describe the foods eaten yesterday than foods eaten at an earlier time. The method requires as few as two independent days of nutrient intake information or three consecutive days for at least a subsample of the individuals. It removes biases of subsequent reporting days compared with the first day, and temporal effects such as day-of-the-week and seasonal effects can be easily removed. The method developed at ISU is described conceptually and applied to data collected in the 1989-91 USDA Continuing Survey of Food Intakes by Individuals to estimate the proportion of men and women age 20 y and older having ''usual'' (long-run average) intakes below 30% of energy from fat, below the 1989 Recommended Dietary Allowances for vitamin A and folate, and above 1000 mu g for folate. These results were compared with the results from the distributions of 1-d intakes and of 3-d mean intakes to demonstrate the effect of within-person variation and asymmetry on usual nutrient intakes in a population.