Voci Silvia Maria, Slater Betzabeth, da Silva Marina Vieira, Marchioni Dirce Maria Lobo, Latorre Maria do Rosário Dias de Oliveira
Departamento de Nutrição, Faculdade de Saúde Pública, Universidade de São Paulo, São Paulo, SP, 01246-904, Brazil.
Cien Saude Colet. 2011 Apr;16(4):2335-43. doi: 10.1590/s1413-81232011000400033.
In order to establish calibration factors of the Adolescent Food Frequency Questionnaire (AFFQ), 74 boys and girls from Piracicaba (SP, Brazil) with ages ranging from 10 to 14 took part in the study. Dietary intake (assessed by the food frequency questionnaire and 24-hour recall) was assessed and adjusted for energy intake. Descriptive statistics, variance analysis using one classification factor, Pearson's correlation coefficients and linear regression were performed. The average of two 24-hour recalls was used as a reference for calibration of data. Calibration coefficients (λ) ranged from -0.07 (iron) to 0.40 (vitamin C) revealing substantial error in the dietary method tested, albeit similar to those observed in the literature. As these coefficients were low, they indicate the need for reformulating the instrument regarding some nutrients, though application was not considered advisable for correcting information on iron and retinol. The methodology used to calibrate dietary data can consider measurement error in the assessment when its assumptions are respected, since violations of these assumptions may lead to other errors that are difficult to predict.
为了确定青少年食物频率问卷（AFFQ）的校准系数，来自巴西圣保罗州皮拉西卡巴的74名年龄在10至14岁之间的男孩和女孩参与了这项研究。评估了饮食摄入量（通过食物频率问卷和24小时回顾法进行评估），并根据能量摄入量进行了调整。进行了描述性统计、使用单分类因素的方差分析、皮尔逊相关系数和线性回归分析。将两次24小时回顾的平均值用作数据校准的参考。校准系数（λ）范围从-0.07（铁）到0.40（维生素C），这表明所测试的饮食方法存在较大误差，尽管与文献中观察到的误差相似。由于这些系数较低，表明需要针对某些营养素重新制定该工具，不过不建议应用该工具来校正铁和视黄醇的信息。当校准饮食数据所使用的方法的假设得到遵守时，该方法可以考虑评估中的测量误差，因为违反这些假设可能会导致其他难以预测的误差。
