Kato Erika, Takachi Ribeka, Ishihara Junko, Ishii Yuri, Sasazuki Shizuka, Sawada Norie, Iwasaki Motoki, Shinozawa Yurie, Umezawa Jun, Tanaka Junta, Yokoyama Yuta, Kitamura Kaori, Nakamura Kazutoshi, Tsugane Shoichiro
Department of Community Preventive Medicine, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan.
Department of Community Preventive Medicine, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan; Department of Food Science and Nutrition, Faculty of Human Life and Environment, Nara Women's University, Nara, Japan.
J Epidemiol. 2017 Sep;27(9):435-446. doi: 10.1016/j.je.2016.08.021. Epub 2017 Jun 30.
Online dietary assessment tools offer advantages over printed questionnaires, such as the automatic and direct data storage of answers, and have the potential to become valuable research methods. We developed an online survey system (web-FFQ) for the existing printed FFQ used in the JPHC-NEXT protocol, the platform of a large-scale genetic cohort study. Here, we examined the validity of ranking individuals according to dietary intake using this web-FFQ and its usability compared with the printed questionnaire (print-FFQ) for combined usage.
We included 237 men and women aged 40-74 years from five areas specified in the JPHC-NEXT protocol. From 2012 to 2013, participants were asked to provide 12-day weighed food records (12d-WFR) as the reference intake and to respond to the print- and web-FFQs. Spearman's correlation coefficients (CCs) between estimates using the web-FFQ and 12d-WFR were calculated. Cross-classification of intakes was compared with those using the print-FFQ.
Most participants (83%) answered that completing the web-FFQ was comparable to or easier than completing the printed questionnaire. The median value of CCs across energy and 53 nutrients for men and women was 0.47 (range, 0.10-0.86) and 0.46 (range, 0.16-0.69), respectively. CCs for individual nutrient intakes were closely similar to those based on the print-FFQ, irrespective of response location. Cross-classification by quintile of intake based on two FFQs was reasonably accurate for many nutrients and food groups.
This online survey system is a reasonably valid measure for ranking individuals by intake for many nutrients, like the printed FFQ. Mixing of two FFQs for exposure assessments in epidemiological studies appears acceptable.
在线饮食评估工具相较于纸质问卷具有诸多优势，例如答案可自动直接存储，有潜力成为有价值的研究方法。我们为大规模基因队列研究平台JPHC-NEXT方案中使用的现有纸质食物频率问卷（FFQ）开发了一个在线调查系统（网络FFQ）。在此，我们检验了使用该网络FFQ根据饮食摄入量对个体进行排名的有效性，以及与纸质问卷（纸质FFQ）联合使用时的可用性。
我们纳入了JPHC-NEXT方案指定的五个地区的237名年龄在40 - 74岁之间的男性和女性。在2012年至2013年期间，要求参与者提供12天的称重食物记录（12d-WFR）作为参考摄入量，并回答纸质和网络FFQ。计算了使用网络FFQ和12d-WFR估计值之间的斯皮尔曼相关系数（CCs）。将摄入量的交叉分类与使用纸质FFQ的情况进行了比较。
大多数参与者（83%）表示完成网络FFQ与完成纸质问卷相当或更容易。男性和女性能量及53种营养素的CCs中位数分别为0.47（范围0.10 - 0.86）和0.46（范围0.16 - 0.69）。无论回答地点如何，个体营养素摄入量的CCs与基于纸质FFQ的情况非常相似。基于两种FFQ按摄入量五分位数进行的交叉分类对于许多营养素和食物组来说相当准确。
这个在线调查系统是一种对许多营养素按摄入量对个体进行排名的合理有效的测量方法，类似于纸质FFQ。在流行病学研究中混合使用两种FFQ进行暴露评估似乎是可以接受的。
