Technische Universität München, School of Management, Marketing and Consumer Research, Freising, Germany.
Nutr J. 2011 Dec 7;10:133. doi: 10.1186/1475-2891-10-133.
The aim of this study was to determine the relative validity of the self-administered Food Frequency Questionnaire (FFQ) "What do you eat?", which was used in the German National Health Interview and Examination Survey for Children and Adolescents (KiGGS 2003-2006).
The validation was conducted in the EsKiMo Nutrition Module, a subsample of KiGGS. The study population included 1,213 adolescents aged between 12 and 17. A modified diet history interview DISHES (Dietary Interview Software for Health Examination Studies) was used as the reference method. In order to compare the food groups, the data assessed with both instruments were aggregated to 40 similar food groups. The statistical analysis included calculating and comparing Spearman's correlation coefficients, calculating the mean difference between both methods, and ranking participants (quartiles) according to food group consumption, including weighted kappa coefficients. Correlations were also evaluated for relative body weight and socioeconomic status subgroups.
In the total study population the Spearman correlation coefficients ranged from 0.22 for pasta/rice to 0.69 for margarine; most values were 0.50 and higher. The mean difference ranged between 1.4% for milk and 100.3% for pasta/rice. The 2.5 percentiles and 97.5 percentiles indicated a wide range of differences. Classifications in the same and adjacent quartile varied between 70.1% for pasta/rice and 90.8% for coffee. For most groups, Cohen's weighted kappa showed values between 0.21 and 0.60. Only for white bread and pasta/rice were values less than 0.20. Most of the 40 food groups showed acceptable to good correlations in all investigated subgroups concerning age, sex, body weight and socio-economic status.
The KiGGS FFQ showed fair to moderate ranking validity except for pasta/rice and white bread. However, the ability to assess absolute intakes is limited. The correlation coefficients for most food items were similar for normal weight and overweight as well as for different socio-economic status groups. Overall, the results of the relative validity were comparable to FFQs from the current literature.
本研究旨在确定自我管理的食物频率问卷（FFQ）“你吃什么？”在德国国家健康访谈和体检调查（KiGGS 2003-2006）中的相对有效性。
验证在 EsKiMo 营养模块中进行，该模块是 KiGGS 的一个子样本。研究人群包括 12 至 17 岁的 1213 名青少年。使用改良的饮食史访谈 DISHES（健康检查研究饮食软件）作为参考方法。为了比较食物组，使用两种仪器评估的数据被汇总为 40 个相似的食物组。统计分析包括计算和比较 Spearman 相关系数、计算两种方法之间的均值差异，并根据食物组消费对参与者（四分位数）进行排序，包括加权 kappa 系数。还评估了相对体重和社会经济地位亚组的相关性。
在整个研究人群中，Spearman 相关系数的范围从意大利面/米饭的 0.22 到人造黄油的 0.69；大多数值为 0.50 及以上。均值差异范围在牛奶的 1.4%和意大利面/米饭的 100.3%之间。2.5%和 97.5%的百分位数表示差异范围很广。在同一和相邻四分位数中的分类在意大利面/米饭的 70.1%和咖啡的 90.8%之间变化。对于大多数组，Cohen 的加权 kappa 显示值在 0.21 和 0.60 之间。只有白面包和意大利面/米饭的数值小于 0.20。在所有调查的年龄、性别、体重和社会经济地位亚组中，40 个食物组中的大多数都表现出可接受到良好的相关性。
KiGGS FFQ 除了意大利面/米饭和白面包外，具有良好的中等排名有效性。然而，评估绝对摄入量的能力是有限的。对于正常体重和超重以及不同社会经济地位组，大多数食物项目的相关系数相似。总体而言，相对有效性的结果与当前文献中的 FFQ 相当。
