Calibration of the dietary questionnaire for the Canadian Study of Diet, Lifestyle and Health cohort
Calibration of the dietary questionnaire for the Canadian Study of Diet, Lifestyle and Health cohort
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DOI：
10.1079/phn2002362
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发表时间：
2003-02-01
影响因子：
3.2
通讯作者：
Kreiger, N
中科院分区：
文献类型：
--
作者：
Jain, MG;Rohan, TE;Kreiger, N
目的：为了正确解释使用食物频率问卷（FFQ）的流行病学研究结果，有必要了解从FFQ中报告的摄入量与真实的日常摄入量之间的关系。在本文中，我们报告了一项校准研究，以调查FFQ在加拿大饮食、生活方式和健康研究队列研究中的表现。方法：在1年的时间里，151名男性和159名女性完成了一套完整的问卷调查，包括自我管理的基线FFQ，三次通过电话进行的24小时饮食回忆，以及随后自我管理的第二次FFQ。通过计算去衰减的Pearson相关系数来评估FFQs得出的营养估计值与饮食召回之间的关联。结果：FFQs估计的平均每日营养摄入量高于饮食回忆。当将3次24小时回忆的平均对数转换和能量调整后的营养摄入量与基线FFQ进行比较时，分别在男性和女性中获得了以下去衰减相关性：总能量0.44和0.32，总脂肪0.64和0.68，饱和脂肪0.68和0.70，膳食纤维0.65和0.44，维生素E 0.32和0.37，维生素C 0.40和0.37，β -胡萝卜素0.34和0.29，酒精0.74和0.67，咖啡因0.81和0.76，相关系数中位数分别为0.49和0.53。第二次FFQ和饮食回忆之间的相关性相似。两种ffq之间的相关性作为可靠性测试，在选定的营养素中，男性的中位数为0.64，女性的中位数为0.63。结论：研究表明，当限于能量调整值和去衰减值时，FFQ方法给出了可接受的营养水平或食品成分估计值，正如这项针对饮食召回的校准研究所评估的那样。
Objective: For proper interpretation of results from epidemiological studies that use food-frequency questionnaires (FFQs), it is necessary to know the relationship between reported intakes from the FFQ and true usual intake. In this paper, we report a calibration study conducted to investigate the performance of the FFQ used in a cohort study, the Canadian Study of Diet, Lifestyle and Health.Methods: Over a 1-year period, 151 men and 159 women completed a full set of questionnaires including a self-administered baseline FFQ, three 24-hour diet recalls administered by telephone, and a second FFQ self-administered subsequently. The association between the nutrient estimates derived from the FFQs and the diet recalls was evaluated by calculating deattenuated Pearson's correlation coefficients.Results: The FFQs estimated mean daily nutrient intakes higher than the diet recalls. When the log-transformed and energy-adjusted nutrient intakes from the average of three 24-hour recalls were compared against the baseline FFQ, the following deattenuated correlations were obtained in men and women, respectively: total energy 0.44 and 0.32, total fat 0.64 and 0.68, saturated fat 0.68 and 0.70, dietary fibre 0.65 and 0.44, vitamin E 0.32 and 0.37, vitamin C 0.40 and 0.37, beta-carotene 0.34 and 0.29, alcohol 0.74 and 0.67, caffeine 0.81 and 0.76, with a median correlation of 0.49 and 0.53. Correlations between the second FFQ and diet recalls were similar. The correlations between the two FFQs as a test of reliability had a median value 0.64 for men and 0.63 for women for selected nutrients.Conclusions: The study suggests that the FFQ method gives acceptable levels of nutrients or food component estimates, as assessed by this calibration study against diet recalls, when limited to energy-adjusted and deattenuated values.