Assessing the validity of a food frequency questionnaire among low-income women in São Paulo, southeastern Brazil
Assessing the validity of a food frequency questionnaire among low-income women in São Paulo, southeastern Brazil
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DOI：
10.1590/s0102-311x2010001100007
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发表时间：
2010-11-01
期刊：
影响因子：
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通讯作者：
Laguna, Elaine Cristina
中科院分区：
文献类型：
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作者：
Cardoso, Marly Augusto;Tomita, Luciana Yuki;Laguna, Elaine Cristina
这项研究描述了食物频率问卷(FFQ)在93名低收入妇女(20-65岁)中的有效性，她们参加了巴西圣保罗的一项病例对照研究。在2003至2004年间，进行了两次FFQ(FFQ1和FFQ2，相隔12个月)和三次24小时饮食召回(24小时)，以估计过去一年的饮食摄入量。皮尔逊相关系数(粗略的、能量调整的和去衰减的)用于FFQ和24小时之间的比较。通过Bland-Altman分析进一步检验了方法之间的一致性。对于长期可靠性的评估，能量调整的类内相关系数大多在0.40左右，但维生素A和叶酸的相关性更高(0.50-0.56)。能量调整、衰减校正的FFQ和DR之间的皮尔逊效度相关范围为0.30-0.54(常量营养素)到0.20-0.48(微量营养素)，钙的效度较高(0.75)。有一小部分营养摄入量被严重分类错误，而Bland-Altman曲线图表明，FFQ在评估群体水平的营养摄入量方面是准确的。
This study describes the validity of a food frequency questionnaire (FFQ) in 93 low-income women (20-65 years), participating in a case-control study in Sao Paulo, Brazil. Two FFQ (FFQ1 and FFQ2, 12 months apart) and three 24-hour dietary recalls (24hR) were conducted between 2003 and 2004 to estimate dietary intake during the past year. The Pearson correlation coefficients (crude, energy-adjusted and de-attenuated) were used for comparisons between FFQ and 24hR. The agreement between the methods was further examined by the Bland-Altman analysis. For the assessment of long-term reliability, the energy-adjusted intra-class correlation coefficients were mostly around 0.40, but higher for vitamin A and folate (0.50-0.56). Energy-adjusted, attenuation-corrected Pearson validity correlations between FFQ and DR ranged from 0.30-0.54 for macronutrients to 0.20-0.48 for micronutrients, with higher value for calcium (0.75). There were small proportions of grossly misclassified nutrient intakes, while Bland-Altman plots indicated that the FFQ is accurate in assessing nutrient intake at a group level.