Validation of Web-based Multimedia Dietary Assessment Tools

在流行病学研究中，人们越来越需要低成本和准确的方法来测量膳食摄入量和身体活动。该提案要求资金用于检查两种新的饮食评估工具的精确性，计算机辅助自我访谈饮食历史（CASI-DH），其模仿饮食历史的优势，最强大的饮食评估方法之一，以及全自动多媒体24小时回忆：DIETDAY。CASI-DH是一种基于网络的自我访谈方法，以膳食音频和食物图片为基础;生成营养和食物摄入量估计;具有广泛的组件来评估膳食补充剂的使用，并提供反馈，以帮助人们采取更健康的饮食习惯，它在许多重要方面不同于食物频率问卷，因为它是完全定量的，包括数千种食物，是基于膳食的，并且不减少食物或消耗频率。本文提出的验证研究的目的是通过比较通过CASI-DH获得的自我报告的营养素和食物摄入量，并使用DIETDA在150名非洲裔美国人和150名白人成年人的样本中客观验证生物标志物，来测试这些新工具捕获日常死亡的准确性。（总能量、蛋白质和钾）、蔬菜和水果以及补充剂使用，通过使用双标记水来测定总能量、蛋白质的24小时尿氮;膳食钾的尿钾;以及水果、蔬菜和营养补充剂使用的营养素（类胡萝卜素和生育酚）的血液水平。还将追求一些次要目标，包括验证两个身体活动问卷和两个DLW的加速计方法。为了研究CASI-DH、DIETDAY和DLW的重现性，将对100人的子集进行重复测量，间隔6个月。由于其成本低，系统的语言独立性，以及依赖图像进行准确的交流，CASI-DH和DIETDAY为各种人群的流行病学研究提供了独特的机会，以评估复杂的饮食暴露。成功验证CASI-DH或DIETDAY将代表营养流行病学的重要方法学进展。这项研究也将有助于我们在多种族人群中对这些饮食和活动评估工具的信心。

There is an increasing demand for low cost and accurate methods to measure dietary intake and physica activity in epidemiologic studies. This proposal requests funds to examine the precision of two new dietar assessment tool, the Computer-Assisted Self-Interview Diet History (CASI-DH), which is modeled after th strengths of the diet history, one of the strongest dietary assessment approaches and ana fully automate multimedia 24 hour recall: DIETDAY. The CASI-DH is a web-based, self-interview approach that is meal- audio-, and food picture-based; generates nutrient and food intake estimates; has an extensive componen to assess dietary supplement use and provides feedback to help people adopt more healthful dietary habits It differs in many significant ways from food frequency questionnaires in that it is fully quantitative, include thousands of foods, is meal-based, and does not truncate foods or frequencies of consumption. Th objective of the validation study proposed here is to test how accurately these new tools capture usual die by comparing self-reported nutrient and food intakes obtained through the CASI-DH and using the DIETDA to objective validation biomarkers in a sample of 150 African American and 150 Caucasian adults Specifically, we aim to examine the validity of both instruments for intakes of nutrients (total energy, protein and potassium), vegetables and fruits and supplement use by using doubly labeled water for total energy 24-hour urinary nitrogen for protein; urinary potassium for dietary potassium; and blood levels of nutrient (carotenoids and tocopherols) for fruits, vegetables, and nutritional supplement use. A number of secondar aims will also be pursued, including validation of two physical activity questionnaires and two differen accelerometry approaches to DLW. To study the reproducibility of the CASI-DH, DIETDAY and DLW, repea measures will be conducted on a subset of 100 persons 6 months apart. Due to its low cost, the languag independence of the system, and the reliance on images for accurate communication, the CASI-DH an DIETDAY present unique opportunities for epidemiologic research in various populations for assessment o complex dietary exposures. Successful validation of either the CASI-DH or the DIETDAY will represen important methodological advances in nutritional epidemiology.Theepidemiology. The study will als contribute to our confidence in these dietary and activity assessment instruments in multiracial populations.