Within- and between-person variation in nutrient intakes of Russian and US children differs by sex and age
Within- and between-person variation in nutrient intakes of Russian and US children differs by sex and age
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DOI：
10.1093/jn/134.11.3114
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发表时间：
2004-11-01
影响因子：
4.2
通讯作者：
Popkin, BM
中科院分区：
文献类型：
--
作者：
Jahns, L;Carriquiry, A;Popkin, BM
在不同的成年人群中，营养素摄入量的人内和人与人之间的差异已经得到了表征，但对儿童的国家、年龄或性别差异知之甚少。本研究的目的是：1）描述1996年俄罗斯和美国9-18岁儿童营养素摄入量的平均值、个体内和个体间变异系数和变异比，2）比较两国营养素摄入量变异的年龄和性别差异;以及3）假设使用来自一个全国代表性样本的个体内方差估计来调整另一个全国代表性样本中通常的摄入量分布的可行性。除镁外，美国儿童所有营养素的平均摄入量均显著较高（P < 0.001）;美国儿童的人内变异较高，可能表明他们更容易获得各种各样的食物。在这两个国家，性别的方差分量存在很大的差异，尽管方向不同，但在美国女孩中，年龄不同。俄罗斯儿童（范围：0.9-1.6）的11种营养素中有8种的人内与人间方差比低于美国儿童（范围：1.4-1.7），这表明日常偏见可能不会像美国那样强烈地影响俄罗斯的饮食回忆。鼓励研究人员使用这些估计值进行敏感性分析，通常摄入量分布在自己的数据时，多天的数据收集是不可行的。
Within- and between-person variation in nutrient intake has been characterized in different adult populations, but little is known of country, age, or sex differences among children. The objectives of this study were as follows: 1) to describe the mean intake, within- and between-individual CV and variance ratios of nutrient intake among children ages 9-18 y old in Russia and the United States in 1996; 2) to compare the age and sex-related differences in nutrient intake variance within and between countries; and 3) to hypothesize about the feasibility of using within-individual variance estimates from one nationally representative sample to adjust the usual intake distributions in another nationally representative sample. Mean intakes of all nutrients except magnesium were significantly higher among U.S. children (P < 0.001); within-person variation was higher among the U.S. children, possibly indicating greater access to a wide array of foods. Strong differentials existed in variance components by sex in both countries, although not in the same direction, and differed by age in U.S. girls. Ratios of within- to between-person variance in 8 of 11 nutrients were lower among Russian (range: 0.9-1.6) than U.S. children (range: 1.4-1.7), suggesting that day-to-day bias may not affect Russian dietary recalls as strongly as in the United States. Researchers are encouraged to use these estimates to conduct sensitivity analyses of usual intake distributions in their own data when multiple days of data collection are not feasible.