Universidade de São Paulo, Brasil.
Cad Saude Publica. 2010 Nov;26(11):2059-67. doi: 10.1590/s0102-311x2010001100007.
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 São 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.
本研究描述了一种食物频率问卷（FFQ）在 93 名低收入女性（20-65 岁）中的有效性，这些女性参与了巴西圣保罗的一项病例对照研究。在 2003 年至 2004 年期间进行了两次 FFQ（FFQ1 和 FFQ2，相隔 12 个月）和三次 24 小时膳食回忆（24hR），以估计过去一年的饮食摄入量。皮尔逊相关系数（原始、能量调整和去衰减）用于比较 FFQ 和 24hR。通过 Bland-Altman 分析进一步检查了方法之间的一致性。为了评估长期可靠性，能量调整后的组内相关系数大多在 0.40 左右，但对于维生素 A 和叶酸则更高（0.50-0.56）。能量调整后，FFQ 和 DR 之间的 Pearson 有效性相关系数在宏量营养素方面从 0.30-0.54 不等，在微量营养素方面从 0.20-0.48 不等，钙的相关系数更高（0.75）。存在大量营养素摄入严重分类错误的比例较小，而 Bland-Altman 图表明，FFQ 在评估群体水平的营养素摄入方面是准确的。
