SEPARATING FACT FROM ARTIFACT IN CHANGES IN NUTRIENT INTAKE OVER TIME
SEPARATING FACT FROM ARTIFACT IN CHANGES IN NUTRIENT INTAKE OVER TIME
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DOI：
10.1016/0002-8223(94)90367-0
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发表时间：
1994-03-01
影响因子：
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通讯作者：
VIZIOLI, TL
中科院分区：
文献类型：
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作者：
GUENTHER, PM;PERLOFF, BP;VIZIOLI, TL
目的确定1977-1978年全国食物消费调查（1977-78 NFCS）和1987-88 NFCS中使用的程序和营养素数据库之间的差异是否会显着影响估计的平均营养素intakes.Design这是一个分裂样本的现场实验。随机选取72个区域段;在每个部分中选择10个住房单元，并随机分配到两个实验组中的一个。受试者为697名年龄在20 - 49岁之间的妇女，治疗组A使用1987- 2000年的数据进行访谈。采用1987-88年NFCS食物编码、体重转换因子和营养素数据库计算了88例NFCS 24小时回忆程序及其营养素摄入量。B组采用1977-78年NFCS 24小时回忆程序进行访谈，并采用1987-88年和1977-78年NFCS食物代码、体重转换和营养素数据库的各种组合，以四种方式计算营养素摄入量。单变量重复测量方差分析和单变量配对t tests.Results的变化所造成的分析技术的改进和食品抽样数量的增加，营养数据库是大到足以保证修订1977-78年NFCS估计摄入量的铁，镁，维生素B-6和B-12。然而，脂肪、维生素A和硫胺素摄入量的变化是由食物的真实的变化引起的，因此不需要对这些营养素进行修订。其他营养素不受影响。结论当考虑营养素摄入量随时间的变化时，重要的是要纠正早期的食物成分估计，使其准确地反映食物的组成，在他们被消耗的时间。这就需要保留食物成分中的真实的差异，同时纠正由于营养数据质量的提高而造成的人为差异。
Objective To determine whether the differences between the procedures and nutrient databases used in the 1977-1978 Nationwide Food Consumption Survey (1977-78 NFCS) and those used in the 1987-88 NFCS could notably affect the estimated mean nutrient intakes.Design This was a split-sample field experiment. Seventy-two area segments were randomly selected; 10 housing units were selected in each segment and randomly assigned to one of two experimental groups.Setting The study took place in the Philadelphia, Pa, metropolitan area.Subjects The subjects were 697 women aged 20 to 49 years.Treatment Group A was interviewed using 1987-88 NFCS 24 hour recall procedures and their nutrient intakes were calculated using the 1987-88 NFCS food codes, weight conversion factors, and nutrient database. Group B was interviewed using 1977-78 NFCS 24-hour recall procedures and nutrient intakes were calculated four ways using various combinations of 1987-88 and 1977-78 NFCS food codes, weight conversions, and nutrient database.Main outcome measure Mean intakes of food energy and 14 nutrients were calculated.Statistical analysis We used two-sample, multivariate t tests; univariate t tests; univariate repeated measures analysis of variance; and univariate paired t tests.Results Changes in the nutrient database caused by improved analytic techniques and increased number of foods sampled were great enough to warrant revising the 1977-78 NFCS estimated intakes for iron, magnesium, and vitamins B-6 and B-12. Changes in intake of fat, vitamin A, and thiamin, however, were caused by real changes in foods so no revisions were necessary for these nutrients. Other nutrients were unaffected.Conclusion When considering changes in nutrient intake over time, it is important to correct the earlier food composition estimates so that they accurately reflect the composition of foods at the time they were consumed. This requires preserving the real differences in the composition of foods while correcting for artifactual differences attributable to improvements in the quality of nutrient data.