de Assis M A A, Kupek E, Guimarães D, Calvo M C M, de Andrade D F, Bellisle F
Post-Graduate Program in Nutrition, Centro de Ciências da Saúde, Universidade Federal de Santa Catarina, Campus Universitário - Trindade, Florianópolis 88040-900, Santa Catarina, Brazil.
Appetite. 2008 Jul;51(1):187-93. doi: 10.1016/j.appet.2008.02.014. Epub 2008 Mar 10.
The aim of this study was to assess the reliability and external validity of the Previous Day Food Questionnaire (PDFQ) designed to obtain a report of the foods eaten on the previous day by schoolchildren. Participants were 7-10-year-old school children of the first four grades of a public school in Southern Brazil (N=227). Test-retest reliability was evaluated by kappa coefficient for two administrations of the PDFQ on the same day to the same children. External validity of the PDFQ was evaluated via sensitivity, specificity, and positive and negative predictive values (PPV and NPV, respectively) using trained observers of the food eaten on the previous day as gold standard. The association between responses from observed food intake with those from reported food intake on PDFQ was evaluated by multivariate logistic regression, controlled for school grade, gender, time of the eating, and the variation between first and second PDFQ applications. For the reliability study, the analyses stratified by school eating occasions (3 a day) indicated that agreement level was moderate or better for all food categories. PDFQ's sensitivity ranged from 57.1% (vegetables) to 93.3% (rice), whereas its specificity ranged from 77.8% (bread/pasta) to 98% (meats). Both, PPV and NPV were reasonably high. PDFQ was highly associated with observed food intake, with effect magnitude several times larger than any other factor analyzed for all foods. PDFQ also showed good test-retest reliability, suggesting that it may generate reliable and valid data for assessing food intake at the group (school) level.
本研究的目的是评估前一日食物问卷（PDFQ）的可靠性和外部有效性，该问卷旨在获取学童前一日所吃食物的报告。参与者为巴西南部一所公立学校一至四年级7至10岁的学童（N = 227）。通过对同一批儿童在同一天进行两次PDFQ测试的kappa系数来评估重测信度。以经过培训的前一日食物摄入观察者作为金标准，通过敏感性、特异性以及阳性和阴性预测值（分别为PPV和NPV）来评估PDFQ的外部有效性。通过多因素逻辑回归评估观察到的食物摄入量与PDFQ上报的食物摄入量之间的关联，并对学校年级、性别、进食时间以及首次和第二次PDFQ应用之间的差异进行了控制。对于信度研究，按学校进食次数（一天3次）分层的分析表明，所有食物类别的一致性水平为中等或更好。PDFQ的敏感性范围为57.1%（蔬菜）至93.3%（米饭），而其特异性范围为77.8%（面包/面食）至98%（肉类）。PPV和NPV都相当高。PDFQ与观察到的食物摄入量高度相关，其效应大小比所有食物分析的任何其他因素都大几倍。PDFQ还显示出良好的重测信度，表明它可能为评估群体（学校）层面的食物摄入量生成可靠有效的数据。
