Bohlscheid-Thomas S, Hoting I, Boeing H, Wahrendorf J
Division of Epidemiology, German Cancer Research Centre, Heidelberg, Germany.
Int J Epidemiol. 1997;26 Suppl 1:S59-70. doi: 10.1093/ije/26.suppl_1.s59.
For the German part of the European Prospective Investigation into Cancer and Nutrition (EPIC), a self-administered, optically-readable food frequency questionnaire (FFQ), including 158 food items and 87 coloured portion size photographs, was developed to assess the usual food and nutrient intake of individuals during the past year. In 1991/1992, the reproducibility and validity of the questionnaire measurements were studied according to the EPIC protocol. This article reports the results on reproducibility and relative validity of measurement of food group intake.
A total of 104 men and women aged 35-64 years, who are members of the local health insurance institution, AOK Heidelberg, participated in this study. Reproducibility of the questionnaire measurements was obtained by a repeated administration of the FFQ to the same study subjects at a 6-month interval. The mean of 12 24-hour dietary recalls applied at monthly intervals served as reference method for the estimation of the relative validity of questionnaire measurements. A second version of the FFQ that integrated questions on general food consumption patterns was also investigated.
Spearman test-retest correlations of food group intake ranged from 0.49 for bread to 0.89 for alcoholic beverages (median = 0.70). Spearman correlations between food group intake values derived from the 24-hour diet recalls and the FFQ completed in the summer of 1992 varied from 0.14 for legumes to 0.90 for alcoholic beverages (median = 0.45). Correction for attenuation due to within-person error in the reference method as well as the correction for general consumption patterns improved the correlations.
The results indicate that our newly developed FFQ gives reproducible estimates of food group intake. Large day-to-day variation in food group intake complicated the evaluation of FFQ validity. Overall, moderate levels of relative validity were observed for estimates of food group intake.
针对欧洲癌症与营养前瞻性调查（EPIC）的德国部分，开发了一份自我管理的、光学可读的食物频率问卷（FFQ），其中包括158种食物项目和87张彩色份量大小照片，用于评估个体在过去一年中的日常食物和营养摄入量。1991/1992年，根据EPIC方案研究了问卷测量的重复性和有效性。本文报告了食物组摄入量测量的重复性和相对有效性结果。
共有104名年龄在35 - 64岁之间、属于当地医疗保险机构奥克海德堡（AOK Heidelberg）的男性和女性参与了本研究。通过在6个月的间隔内向同一研究对象重复发放FFQ来获得问卷测量的重复性。以每月间隔进行的12次24小时饮食回顾的平均值作为评估问卷测量相对有效性的参考方法。还对整合了关于一般食物消费模式问题的FFQ第二版进行了研究。
食物组摄入量的Spearman重测相关性范围从面包的0.49到酒精饮料的0.89（中位数 = 0.70）。1992年夏季从24小时饮食回顾得出的食物组摄入量值与FFQ之间的Spearman相关性范围从豆类的0.14到酒精饮料的0.90（中位数 = 0.45）。对参考方法中个体内误差导致的衰减进行校正以及对一般消费模式进行校正后，相关性得到了改善。
结果表明，我们新开发的FFQ能够对食物组摄入量给出可重复的估计。食物组摄入量的每日变化较大，这使得FFQ有效性的评估变得复杂。总体而言，食物组摄入量估计的相对有效性处于中等水平。
