Molag Marja L, de Vries Jeanne H M, Duif Niels, Ocké Marga C, Dagnelie Pieter C, Goldbohm R Alexandra, van't Veer Pieter
Division of Human Nutrition, Wageningen University, Bomenweg 4, Wageningen, The Netherlands.
Br J Nutr. 2010 Aug;104(3):446-56. doi: 10.1017/S0007114510000401. Epub 2010 Apr 8.
The authors automated the selection of foods in a computer system that compiles and processes tailored FFQ. For the selection of food items, several methods are available. The aim of the present study was to compare food lists made by MOM2, which identifies food items with highest between-person variance in intake of the nutrients of interest without taking other items into account, with food lists made by forward regression. The name MOM2 refers to the variance, which is the second moment of the nutrient intake distribution. Food items were selected for the nutrients of interest from 2 d of recorded intake in 3524 adults aged 25-65 years. Food lists by 80 % MOM2 were compared to those by 80 % explained variance for regression on differences between the number and type of food items, and were evaluated on (1) the percentage of explained variance and (2) percentage contribution to population intake computed for the selected items on the food list. MOM2 selected the same food items for Ca, a few more for fat and vitamin C, and a few less for carbohydrates and dietary fibre than forward regression. Food lists by MOM2 based on 80 % of variance in intake covered 75-87 % of explained variance for different nutrients by regression and contributed 53-75 % to total population intake. Concluding, for developing food lists of FFQ, it appears sufficient to select food items based on the contribution to variance in nutrient intake without taking covariance into account.
作者在一个编译和处理定制化食物频率问卷（FFQ）的计算机系统中实现了食物选择自动化。对于食物项目的选择，有几种方法可用。本研究的目的是比较由MOM2生成的食物清单与通过向前回归生成的食物清单，MOM2在不考虑其他项目的情况下，识别出感兴趣营养素摄入量个体间差异最大的食物项目。MOM2这个名称指的是方差，它是营养素摄入量分布的二阶矩。从3524名年龄在25 - 65岁的成年人2天的记录摄入量中，为感兴趣的营养素选择食物项目。将80% MOM2生成的食物清单与80%解释方差生成的食物清单在食物项目数量和类型的差异回归方面进行比较，并在以下两方面进行评估：（1）解释方差的百分比；（2）为食物清单上所选项目计算的对总体摄入量的贡献百分比。与向前回归相比，MOM2为钙选择了相同的食物项目，为脂肪和维生素C多选择了一些，为碳水化合物和膳食纤维少选择了一些。基于摄入量80%方差的MOM2食物清单，对于不同营养素，通过回归覆盖了解释方差的75 - 87%，并对总体摄入量贡献了53 - 75%。结论是，在制定FFQ的食物清单时，似乎仅基于对营养素摄入量方差的贡献来选择食物项目而不考虑协方差就足够了。
