Validation and calibration of food-frequency questionnaire measurements in the Northern Sweden Health and Disease cohort
Validation and calibration of food-frequency questionnaire measurements in the Northern Sweden Health and Disease cohort
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DOI：
10.1079/phn2001315
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发表时间：
2002-06-01
影响因子：
3.2
通讯作者：
Kaaks, R
中科院分区：
文献类型：
--
作者：
Johansson, I;Hallmans, G;Kaaks, R
目的：评估再现性，并比较和校准，饮食措施的北方瑞典84项食物频率问卷（FFQ）与措施，从24小时饮食回忆（24-HDR）。设计：从EPIC中随机选择的受访者（n = 246）（饮食癌）和莫妮卡在瑞典北方的一个饮食-心血管疾病研究队列中，（FFQ 1和FFQ 2），并在两个月之间完成10次24小时召回（参考方法）。血浆β-胡萝卜素浓度测定从一个子集的47 participants.Setting：Vasterbotten和Norrbotten，北方Sweden.Participants：96名男性和99名女性，谁完成了study.Results：的重现性FFQ是高的平均能量和营养摄入量和相对排名的参与者的摄入水平（中位数皮尔逊相关系数为0.68）。与24小时召回相比，FFQ 1记录的乳制品、面包/谷物、蔬菜、水果和土豆/米饭/面食的食物摄入频率略高，而肉类、鱼类、甜食和酒精饮料的摄入量较低。FFQ 1与10次24-HDR测量平均值之间的中位斯皮尔曼相关系数为0.50。FFQ 1和24-HDR测量的每日能量和营养素摄入量相似，除了纤维、维生素C、β-胡萝卜素和视黄醇（FFQ 1> 24-HDR）以及蔗糖和胆固醇（FFQ 1 < 24-HDR）。FFQ 1和24-HDR之间的Pearson相关系数校正了由于24-HDR测量值中的残留日间变化引起的衰减，范围为0.36至0.79（中位数为0.54）。调整能源只有非常温和的相关估计的影响。校准系数估计的线性回归的24-HDR的FFQ 1测量值之间变化的0.30和0.59之间的所有营养素，除了酒精，其校准系数接近1.0。这些较低的校正系数表明，与FFQ测量的膳食摄入水平的绝对差异相对应的相对风险估计值通常偏向1.0。血浆β-胡萝卜素水平的皮尔逊相关系数为0.47与24-HDR测量，和0.23与FFQ 1 measurements.Conclusions：北方瑞典FFQ测量具有良好的重现性和估计水平的有效性类似的FFQ测量在其他前瞻性队列研究。本研究的结果将成为校正相对风险估计中衰减和回归稀释偏倚的基础，在未来将FFQ测量与疾病结局相关的研究中。
Objectives: To evaluate the reproducibility of, and to compare and calibrate, diet measures by the Northern Sweden 84-item food-frequency questionnaire (FFQ) with measures from 24-hour diet recalls (24-HDR).Design: Randomly selected respondents (n = 246) from the EPIC (diet-cancer) and MONICA (diet-cardiovascular disease) study cohort in Northern Sweden were invited to answer the FFQ twice over a one-year interval (FFQ1 and FFQ2), and to complete ten 24-hour recalls (reference method) in the months between. Plasma beta-carotene concentrations were determined from a subset of 47 participants.Setting: Vasterbotten and Norrbotten, Northern Sweden.Participants: Ninety-six men and 99 women, who completed the study.Results: The reproducibility of the FFQ was high in terms of both mean energy and nutrient intakes and relative ranking of participants by intake levels (median Pearson correlation of 0.68). Moderately higher food intake frequencies were recorded by FFQ1 compared with 24-hour recalls for dairy products, bread/cereals, vegetables, fruits and potato/rice/pasta, whereas meat, fish, sweet snacks and alcoholic beverage intakes were lower. The median Spearman coefficient of correlation between FFQ1 and the average of ten 24-HDR measurements was 0.50. Daily energy and nutrient intakes were similar for FFQ1 and 24-HDR measurements, except for fibre, vitamin C, beta-carotene and retinol (FFQ1 > 24-HDR) and sucrose and cholesterol (FFQ1 < 24-HDR). Pearson coefficients of correlation between FFQ1 and 24-HDR corrected for attenuation due to residual day-to-day variation in the 24-HDR measurements ranged from 0.36 to 0.79 (median 0.54). Adjustment for energy had only very moderate effects on the correlation estimates. Calibration coefficients estimated by linear regression of the 24-HDR on the FFQ1 measurements varied between 0.30 and 0.59 for all nutrients except alcohol, which had calibration coefficients close to 1.0. These low calibration coefficients indicate that relative risk estimates corresponding to an absolute difference in dietary intake levels measured by the FFQ will generally be biased towards 1.0. Plasma beta-carotene levels had a Pearson coefficient of correlation of 0.47 with the 24-HDR measurements, and of 0.23 with FFQ1 measurements.Conclusions: The Northern Sweden FFQ measurements have good reproducibility and an estimated level of validity similar to that of FFQ measurements in other prospective cohort studies. The results from this study will form the basis for the correction of attenuation and regression dilution biases in relative risk estimates, in future studies relating FFQ measurements to disease outcomes.