Hoover L W, Dowdy R P, Hughes K V
J Am Diet Assoc. 1985 Mar;85(3):297-304, 307.
The USDA Nutrient Data Base (NDB) used to calculate dietary intake in the Nationwide Food Consumption Survey of Individuals 1977-1978 (NFCS) was reduced to two levels. Both reduced data bases were used in analysis of 3-day dietary records collected on 7,914 individuals during the first quarter of that survey. Baseline nutrient intake values for energy and 14 nutrients for 22 sex-age groups were calculated prior to NDB reduction. After reduction, nutrient intake values were again calculated. The magnitude of variation was determined, and ANOVA was used to evaluate those variations at both substitution levels. The NDB reductions resulted in significant alterations in calculated nutrient intake and interactions between NDB type and various sex-age groups. However, the magnitude of the differences in calculated nutrient levels between the original and reduced data bases was, generally, quite small. The notable exception was in the under-1-year sex-age group. On the basis of this study, predictions of nutritional adequacy for the NFCS using the smaller data bases would show essentially the same trends as obtained from the original data base.
用于计算1977 - 1978年全国个人食物消费调查（NFCS）中饮食摄入量的美国农业部营养数据库（NDB）被缩减为两个级别。在该调查的第一季度，这两个缩减后的数据库都被用于分析从7914个人收集的3天饮食记录。在NDB缩减之前，计算了22个性别年龄组的能量和14种营养素的基线营养摄入量值。缩减之后，再次计算营养摄入量值。确定了变化幅度，并使用方差分析（ANOVA）来评估两个替代水平下的这些变化。NDB的缩减导致计算出的营养摄入量以及NDB类型与不同性别年龄组之间的相互作用发生了显著变化。然而，原始数据库和缩减后数据库之间计算出的营养水平差异幅度通常很小。明显的例外是1岁以下的性别年龄组。基于这项研究，使用较小数据库对NFCS的营养充足性进行预测将显示出与从原始数据库获得的基本相同的趋势。
