Instituto de Saúde e Sociedade, Universidade Federal de São Paulo, Av. Ana Costa 95, Santos, São Paulo, Brazil.
Cad Saude Publica. 2011 Nov;27(11):2197-206. doi: 10.1590/s0102-311x2011001100013.
This study aimed to assess the relative validity of a food frequency questionnaire (FFQ) developed to assess food intake of schoolchildren from the Brazilian Western Amazon. The dietary intakes of 61 schoolchildren, aged between six and nine 9 years, were measured using two 24-hour dietary recalls and one FFQ, conducted with the children's, mother or guardians. Validity of the FFQ compared to the mean of the two dietary recalls was assessed using Pearson's correlation coefficient adjusted for attenuation and energy intake, Bland & Altman plots and evaluation of agreement levels between the two assessment methods. Energy-adjusted and deattenuated correlation coefficients ranged from -0.03 for vitamin C, to 0.93 for calcium. The mean coefficient was 0.46. The mean proportion of subjects classified within one quintile by the two methods was 66%. The Bland & Altman plots indicated good agreement for almost all nutrients, with a mean limit of agreement of 108%. These results indicate that, although there was a lack of accuracy for certain nutrients, such as vitamins A and C, the FFQ ensures reliable estimates of intake of most nutrients.
本研究旨在评估为评估巴西西部亚马逊地区学童食物摄入量而开发的食物频率问卷（FFQ）的相对有效性。通过对 61 名 6 至 9 岁儿童进行两次 24 小时膳食回忆和一次 FFQ 调查（由儿童、母亲或监护人完成），测量了儿童的膳食摄入量。使用 Pearson 相关系数（经能量调整和衰减校正）、Bland-Altman 图以及两种评估方法之间的一致性水平评估 FFQ 与两次膳食回忆平均值的有效性。经能量调整和去衰减的相关系数范围从维生素 C 的-0.03 到钙的 0.93。平均系数为 0.46。两种方法分类在同一五分位数的受试者的平均比例为 66%。Bland-Altman 图表明，对于几乎所有营养素，都具有良好的一致性，平均差异界限为 108%。这些结果表明，尽管某些营养素（如维生素 A 和 C）的准确性存在不足，但 FFQ 可以确保对大多数营养素的摄入量进行可靠估计。
