Institute of Nutraceuticals and Functional Foods, Laval University, Québec, QC, Canada.
Eur J Clin Nutr. 2012 Feb;66(2):166-73. doi: 10.1038/ejcn.2011.163. Epub 2011 Sep 21.
BACKGROUND/OBJECTIVES: To assess the validity and the reproducibility of a newly developed web-based, self-administered food frequency questionnaire (web-FFQ).
SUBJECTS/METHODS: A total of 74 healthy subjects (34 men and 40 women) from the Québec City metropolitan area were asked to complete, in random order, the web-FFQ, a validated interviewer-administered FFQ (IA-FFQ) and a 3-day food record (3-day FR).
Mean intakes of 17/22 nutrients assessed between the web-FFQ and the 3-day FR were not significantly different (differences <10%, P≥0.11). Sex and energy-adjusted de-attenuated Pearson correlation coefficients for each nutrient varied from 0.12-0.98 (mean R=0.55, 95% confidence interval 0.46; 0.63) between the web-FFQ and the 3-day FR. All correlations were significant (P≤0.01) and above 0.34 (mean R=0.59, 95% confidence interval 0.54; 0.65) between the web-FFQ and the IA-FFQ, except for sodium (R=0.17, P=0.14). Cross-classification analysis revealed that on average, 77% of subjects were classified in the same or adjacent quartile of nutrient intake between the web-FFQ and the 3-day FR. Correlation coefficients for reproducibility of the web-FFQ tested 4-6 weeks apart in the same individuals were all equal or above 0.48 (P≤0.0001; mean R=0.72, 95% confidence interval 0.68; 0.76). More than 90% of the subjects were classified in the same or adjacent quartile between the two administrations of the web-FFQ, while only 0.8% was misclassified.
These data demonstrate that the newly developed web-based FFQ appears to have reasonable validity and good reproducibility for assessing nutrient intakes at the group and individual levels in a population of healthy adults.
背景/目的：评估一种新开发的基于网络的、自我管理的食物频率问卷（网络-FFQ）的有效性和可重复性。
受试者/方法：共有 74 名来自魁北克市大都市区的健康受试者（34 名男性和 40 名女性）被要求以随机顺序完成网络-FFQ、经过验证的访谈者管理的 FFQ（IA-FFQ）和 3 天食物记录（3 天 FR）。
网络-FFQ 和 3 天 FR 之间评估的 17/22 种营养素的平均摄入量没有显著差异（差异<10%，P≥0.11）。每种营养素的性别和能量调整的去衰减 Pearson 相关系数在网络-FFQ 和 3 天 FR 之间变化范围为 0.12-0.98（平均 R=0.55，95%置信区间 0.46；0.63）。所有相关性均具有统计学意义（P≤0.01），且高于 0.34（平均 R=0.59，95%置信区间 0.54；0.65），除了钠（R=0.17，P=0.14）。交叉分类分析显示，平均而言，77%的受试者在网络-FFQ 和 3 天 FR 之间被归入相同或相邻四分位数的营养素摄入量。在同一受试者中相隔 4-6 周进行的网络-FFQ 可重复性测试的相关系数均等于或高于 0.48（P≤0.0001；平均 R=0.72，95%置信区间 0.68；0.76）。在两次网络-FFQ 检测中，超过 90%的受试者被归入相同或相邻四分位数，而只有 0.8%被错误分类。
这些数据表明，新开发的基于网络的 FFQ 似乎具有合理的有效性和良好的可重复性，可用于评估健康成年人人群中营养素摄入量的群体和个体水平。
