Validity and systematic error in measuring carotenoid consumption with dietary self-report instruments
Validity and systematic error in measuring carotenoid consumption with dietary self-report instruments
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DOI：
10.1093/aje/kwj082
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发表时间：
2006-04-15
影响因子：
5
通讯作者：
Pierce, JP
中科院分区：
文献类型：
--
作者：
Natarajan, L;Flatt, SW;Pierce, JP
蔬菜和水果富含类胡萝卜素，这是一组被认为可以预防癌症的化合物。研究饮食与疾病的关系需要有效和可靠的工具来衡量饮食摄入量。作者提出了一个测量误差模型来评估两种自我报告膳食评估方法的有效性(定义为自我报告摄入量与“真实”摄入量之间的相关性)、系统误差和可靠性。类胡萝卜素的暴露是通过重复24小时回忆、食物频率问卷(FFQ)和血浆标志物来衡量的。该模型应用于1995年至2000年间被分配到女性健康饮食和生活研究非干预部门的1013名参与者，该研究是一项随机试验，评估低脂肪、高蔬菜/水果/纤维饮食对预防新的乳腺癌事件的影响。包括图表在内的诊断法被用来评估拟合程度。24小时召回的有效性为0.44，FFQ的有效性为0.39。对于24小时召回和FFQ，系统误差分别占测量误差方差的22%和50%以上。在饮食疾病研究中单独使用任何一种自我报告方法都可能导致严重的偏见和错误。多种饮食评估方法可能会更准确地估计真实的饮食摄入量。
Vegetables and fruits are rich in carotenoids, a group of compounds thought to protect against cancer. Studies of diet-disease associations need valid and reliable instruments for measuring dietary intake. The authors present a measurement error model to estimate the validity (defined as correlation between self-reported intake and "true" intake), systematic error, and reliability of two self-report dietary assessment methods. Carotenoid exposure is measured by repeated 24-hour recalls, a food frequency questionnaire (FFQ), and a plasma marker. The model is applied to 1,013 participants assigned between 1995 and 2000 to the nonintervention arm of the Women's Healthy Eating and Living Study, a randomized trial assessing the impact of a low-fat, high-vegetable/fruit/fiber diet on preventing new breast cancer events. Diagnostics including graphs are used to assess the goodness of fit. The validity of the instruments was 0.44 for the 24-hour recalls and 0.39 for the FFQ. Systematic error accounted for over 22% and 50% of measurement error variance for the 24-hour recalls and FFQ, respectively. The use of either self-report method alone in diet-disease studies could lead to substantial bias and error. Multiple methods of dietary assessment may provide more accurate estimates of true dietary intake.