Shu X O, Yang G, Jin F, Liu D, Kushi L, Wen W, Gao Y-T, Zheng W
Department of Medicine, Vanderbilt-Ingram Cancer Center, Vanderbilt Center for Health Services Research, Vanderbilt University, Nashville, TN 37232-8300, USA.
Eur J Clin Nutr. 2004 Jan;58(1):17-23. doi: 10.1038/sj.ejcn.1601738.
To evaluate the validity and reliability of the food frequency questionnaire (FFQ) used in the Shanghai Women's Health Study (SWHS), 200 SWHS participants were recruited for a dietary calibration study. Study participants completed an FFQ at baseline and 24-h dietary recalls (24-HDR) twice per month consecutively for 12 months. At the end of the study, a second FFQ was administered. Of the 200 study participants, 196 completed 24 or more days of 24-h dietary recalls, 191 completed two FFQs from whom the results of this report were based. The FFQ included the foods that accounted for 86% of the foods recorded in the 24-HDR surveys. Validity of the FFQ was evaluated by comparing intake levels of major nutrients and foods obtained from the second FFQ with those derived from the multiple 24-HDR. The median intake for major nutrients, rice, poultry and meat derived from the second FFQ and the 24-HDR was similar, with the differences ranging from 1.3 to 12.1%. The FFQ tended to overestimate the intake level of total vegetables and total fruits, and the differences were explained mainly by over-reporting seasonal vegetables and fruits consumption in the FFQ. Nutrient and food intake assessed by the FFQ and the multiple 24-HDR correlated very well, with the correlation coefficients being 0.59-0.66 for macronutrients, 0.41-0.59 for micronutrients, and 0.41-0.66 for major food groups. The reliability of the FFQ was assessed by comparing the correlation and median intake of nutrients and food groups obtained from the two FFQs that were administered approximately 2 y apart. The median intake levels for selected nutrients and food groups derived from the two FFQs were similar with differences below 10%. At the individual level, the intake levels of these dietary variables obtained from two FFQs also correlated well. When nutrient and food group intakes were categorized into quartiles, FFQ and 24-HDR produced exact agreement rates between 33 and 50%. Misclassification to adjacent quartile was common, ranging from 34-48%, while misclassification to an extreme quartile was rare (1-6%). These data indicate that the SWHS FFQ can reliably and accurately measure usual intake of major nutrients and food groups among women in Shanghai.
为评估上海女性健康研究（SWHS）中使用的食物频率问卷（FFQ）的有效性和可靠性，招募了200名SWHS参与者进行饮食校准研究。研究参与者在基线时完成一份FFQ，并连续12个月每月两次进行24小时饮食回顾（24-HDR）。在研究结束时，进行第二次FFQ。在200名研究参与者中，196人完成了24天或更多天数的24小时饮食回顾，191人完成了两份FFQ，本报告的结果基于这191人的数据。FFQ涵盖了在24-HDR调查中记录的86%的食物。通过比较第二次FFQ和多次24-HDR得出的主要营养素和食物的摄入量水平来评估FFQ的有效性。第二次FFQ和24-HDR得出的主要营养素、大米、家禽和肉类的摄入量中位数相似，差异在1.3%至12.1%之间。FFQ往往高估了蔬菜和水果的总摄入量，差异主要是由于FFQ中季节性蔬菜和水果的消费报告过多。FFQ和多次24-HDR评估的营养素和食物摄入量相关性非常好，宏量营养素的相关系数为0.59 - 0.66，微量营养素为0.41 - 0.59，主要食物组为0.41 - 0.66。通过比较相隔约2年进行的两份FFQ得出的营养素和食物组的相关性及摄入量中位数来评估FFQ的可靠性。两份FFQ得出的选定营养素和食物组的摄入量中位数相似，差异低于10%。在个体层面，两份FFQ得出的这些饮食变量的摄入量水平也相关性良好。当营养素和食物组摄入量分为四分位数时，FFQ和24-HDR的完全一致率在33%至50%之间。误分类到相邻四分位数很常见，范围为34% - 48%，而误分类到极端四分位数很少见（1% - 6%）。这些数据表明，SWHS的FFQ能够可靠且准确地测量上海女性主要营养素和食物组的通常摄入量。
