Validation of the EARTH Study Diet History Questionnaire

描述（由申请人提供）：本提案的目的是验证在美国印第安人和阿拉斯加原住民的EARTH队列研究中使用的饮食史问卷（DHQ）。这项父母队列研究的主要目标是确定饮食、体育活动以及其他生活方式和文化因素与慢性疾病的发展和进展之间的关系，并以了解与癌症的关系为长期目标。因此，准确测量饮食、身体活动和其他暴露对于发现有意义的关系至关重要。DHQ提供了对所消耗的食物和营养素的全面评估，其结果可以在个人层面上进行解释。一个自我管理的计算机辅助DHQ版本已经开发出来用于EARTH研究队列。然而，在美国印第安人和阿拉斯加原住民中，使用自我管理的计算机辅助DHQ参考过去一年的摄入量的可行性和DHQ测量饮食暴露的有效性都没有得到证实。大多数关于美洲印第安人和阿拉斯加原住民饮食的信息都是基于单一的24小时回忆，不能反映“通常”的个人摄入量，也没有关于季节性变化影响该人群摄入量的可能性。该项目的目的是就过去一年的通常摄入量评估DHQ的有效性。将评估几个组成部分，包括：1)自我管理的计算机辅助DHQ在营养摄入（蔗糖、能量、脂肪、纤维等）、食物消耗（水果、蔬菜和自给食品）和饮食模式（西方与传统）方面的相对有效性；2) DHQ在营养摄入（蔗糖、能量、脂肪、纤维等）、食物消耗（水果、蔬菜和自给食品）和饮食模式（西方与传统）方面的可重复性（可靠性）；3)计算机自我管理和自我管理的纸笔管理DHQ在营养摄入（蔗糖、能量、脂肪、纤维等）、食物消耗（水果、蔬菜和自给食品）和饮食模式（西方与传统）估计方面的差异。

DESCRIPTION (provided by applicant): The goal of this proposal is to validate a dietary history questionnaire (DHQ) used in the EARTH cohort study of American Indians and Alaska Natives. The major goal of this parent cohort study is to determine how diet, physical activity, and other lifestyle and cultural factors relate to the development and progression of chronic disease with a long-term goal of understanding relationships with cancer. Therefore, accurate measurement of diet, physical activity and other exposures is essential to the ability to detect meaningful relationships. The DHQ provides a comprehensive assessment of foods and nutrients consumed and the results can be interpreted at the individual level. A self-administered computer-assisted version of the DHQ has been developed for use in the EARTH study Cohort. However, neither the feasibility of using the self- administered computer-assisted DHQ referring to intake over the pas year nor the validity of the DHQ for measuring dietary exposures has been established in American Indians and Alaska Natives. Most information about diet of American Indians and Alaska Natives are based on a single 24-hour recall that does not reflect "usual" individual intake and none about the potential for seasonal variability to influence intake in this population. The aim of this project is to assess the validity of the DHQ with regard to usual intake over the past year. Several components will be evaluated including :1) the relative validity of the self- administered computer-assisted DHQ with regards to nutrient intake (sucrose, energy, fat, fiber, and others), food consumption (fruits, vegetables, and subsistence foods), and dietary patterns (western vs. traditional); 2) reproducibility (reliability) of the DHQ with regards to nutrient intake (sucrose, energy, fat, fiber, and others), food consumption (fruits, vegetables, and subsistence foods), and dietary patterns (western vs. traditional); and 3) differences between computerized-self-administration and self-administered paper and pencil administration of the DHQ on the estimates of nutrient intake (sucrose, energy, fat, fiber, and others), food consumption (fruits, vegetables, and subsistence foods), and dietary patterns (western vs. traditional).