Tang W, Aggarwal A, Liu Z, Acheson M, Rehm C D, Moudon A V, Drewnowski A
Center for Public Health Nutrition, University of Washington, Seattle WA, USA.
Urban Form Lab, University of Washington, Seattle WA, USA.
Eur J Clin Nutr. 2016 Mar;70(3):352-7. doi: 10.1038/ejcn.2015.166. Epub 2015 Oct 21.
BACKGROUND/OBJECTIVES: To compare objective food store and eating-out receipts with self-reported household food expenditures.
SUBJECTS/METHODS: The Seattle Obesity Study II was based on a representative sample of King County adults, Washington, USA. Self-reported household food expenditures were modeled on the Flexible Consumer Behavior Survey (FCBS) Module from 2007 to 2009 National Health and Nutrition Examination Survey (NHANES). Objective food expenditure data were collected using receipts. Self-reported food expenditures for 447 participants were compared with receipts using paired t-tests, Bland-Altman plots and κ-statistics. Bias by sociodemographics was also examined.
Self-reported expenditures closely matched with objective receipt data. Paired t-tests showed no significant differences between receipts and self-reported data on total food expenditures, expenditures at food stores or eating out. However, the highest-income strata showed weaker agreement. Bland-Altman plots confirmed no significant bias across both methods-mean difference: 6.4; agreement limits: -123.5 to 143.4 for total food expenditures, mean difference 5.7 for food stores and mean difference 1.7 for eating out. The κ-statistics showed good agreement for each (κ 0.51, 0.41 and 0.49 respectively. Households with higher education and income had significantly more number of receipts and higher food expenditures.
Self-reported food expenditures using NHANES questions, both for food stores and eating out, serve as a decent proxy for objective household food expenditures from receipts. This method should be used with caution among high-income populations, or with high food expenditures. This is the first validation of the FCBS food expenditures question using food store and eating-out receipts.
背景/目的：比较客观的食品店和外出就餐收据与自我报告的家庭食品支出。
对象/方法：西雅图肥胖研究II基于美国华盛顿州金县成年人的代表性样本。自我报告的家庭食品支出以2007年至2009年国家健康和营养检查调查（NHANES）的灵活消费者行为调查（FCBS）模块为模型。使用收据收集客观的食品支出数据。使用配对t检验、布兰德-奥特曼图和κ统计量将447名参与者的自我报告食品支出与收据进行比较。还研究了社会人口统计学的偏差。
自我报告的支出与客观收据数据密切匹配。配对t检验显示，收据与自我报告的总食品支出、食品店支出或外出就餐数据之间没有显著差异。然而，最高收入阶层的一致性较弱。布兰德-奥特曼图证实两种方法均无显著偏差——总食品支出的平均差异为6.4；一致性界限为-123.5至143.4，食品店的平均差异为5.7，外出就餐的平均差异为1.7。κ统计量显示每种情况的一致性良好（分别为κ 0.51、0.41和0.49）。受教育程度较高和收入较高的家庭收据数量显著更多，食品支出也更高。
使用NHANES问题自我报告的食品店和外出就餐食品支出，可作为收据所反映的客观家庭食品支出的良好替代指标。在高收入人群或食品支出较高的人群中应谨慎使用此方法。这是首次使用食品店和外出就餐收据对FCBS食品支出问题进行验证。
