Slater B, Philippi S T, Fisberg R M, Latorre M R D O
Department of Nutrition, School of Public Health, University of São Paulo, São Paulo, Brazil.
Eur J Clin Nutr. 2003 May;57(5):629-35. doi: 10.1038/sj.ejcn.1601588.
To develop a food frequency questionnaire for adolescents (AFFQ) and demonstrate its relative validity.
The final version of the AFFQ was composed of 76 food items previously identified according to their contribution in nutrients and overall importance within the eating habits of this population group. The validation study, which was undertaken during a 6 month period (June to November 1999), was administered to a sample of 79 who answered at least three 24 h dietary recalls (R24 h) applied at intervals of 45 days and one AFFQ at the end of the study. Applying the paired t-test and calculating Pearson correlation coefficients on nutrient data, differences in the mean of nutrients were obtained. Correlation coefficients between the mean energy-adjusted nutrients computed by the two methods were calculated, and correction was made for within-person variability. Agreement was evaluated by distribution of the adolescents according to quartiles of consumption. LOCUS: A public school within the metropolitan region of São Paulo city.
A high variability in the dietary intake of adolescents was observed, with high rates of variability for cholesterol, retinal and vitamin C. The Pearson correlation coefficients, after being adjusted and corrected for variability, ranged from 0.10 to 0.72 among females and from 0.16 and 0.91 among males. The mean correlation coefficient for the entire group was 0.52.
These results indicate that the AFFQ provides a potentially reliable scale for categorizing individuals by level of past intake of most nutrients, excluding retinol and iron.
编制一份青少年食物频率问卷（AFFQ）并证明其相对效度。
AFFQ的最终版本由76种食物组成，这些食物先前根据其在该人群饮食习惯中的营养贡献和总体重要性确定。验证研究在6个月期间（1999年6月至11月）进行，对79名样本进行了调查，这些样本至少回答了三次间隔45天进行的24小时膳食回顾（R24h），并在研究结束时回答了一份AFFQ。应用配对t检验并计算营养数据的Pearson相关系数，得出营养素均值的差异。计算两种方法计算的平均能量调整营养素之间的相关系数，并对个体内变异性进行校正。根据消费四分位数对青少年进行分布评估一致性。地点：圣保罗市大都市区的一所公立学校。
观察到青少年的饮食摄入量存在很大差异，胆固醇、视黄醛和维生素C的变异性很高。经调整和校正变异性后的Pearson相关系数，女性为0.10至0.72，男性为0.16至0.91。整个组的平均相关系数为0.52。
这些结果表明，AFFQ为根据大多数营养素（不包括视黄醇和铁）的过去摄入量水平对个体进行分类提供了一个潜在可靠的量表。
