How many 24-hour recalls or food records are required to estimate usual energy and nutrient intake?
How many 24-hour recalls or food records are required to estimate usual energy and nutrient intake?
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DOI：
10.1590/s0102-311x2010001100011
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发表时间：
2010-11-01
期刊：
影响因子：
--
通讯作者：
Yokoo, Edna Massae
中科院分区：
文献类型：
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作者：
Pereira, Rosângela Alves;Araujo, Marina Campos;Yokoo, Edna Massae
对于膳食摄入评估，人们需要知道最小24小时回忆或食物记录重复，以估计通常的能量和营养摄入量，并根据他们的营养摄入量正确地对受试者进行分类。研究人员分析了来自两项不同的饮食摄入研究的数据，研究对象是巴西里约热内卢大都会地区的300名成年人和169名青少年。为了估计重复数，采用了两种方法：一种基于方差比，另一种仅基于受试者内方差。最重要的结果是男孩和男人需要重复14次，女孩15次，女性23次才能以90%的精度估计能量摄入。同样，男孩需要4次重复，男人需要7次重复，女孩和女人需要对个人的能量摄入进行分类，相关系数为0.9。由于食物摄入量存在内方差，要获得通常摄入量的估计值，所需的重复次数要多于根据饮食摄入水平对受试者进行分类所需的重复次数。
For dietary intake assessments, one needs to know the minimum 24-hour recall or food record replications that are required to estimate usual energy and nutrient intake and to classify subjects correctly according to their nutrient intake. Data from two different studies on dietary intake that were carried out with 300 adults and 169 adolescents in the Rio de Janeiro Metropolitan area, Brazil, were analyzed. To estimate the number of replications two methods were applied: one based on the variances ratio, the other based on the within-subject variance alone. The most important results found were the requirement for 14 replications for boys and men, 15 for girls, and 23 for women in order to estimate energy intake with a precision of 90%. Also four replications for boys and seven for men, girls and women are required to classify individuals' energy intake with a correlation coefficient of 0.9. Due to the within variance in food intake, a larger number of replications is required to obtain estimates of usual intakes than is needed to classify subjects according to levels of dietary intake.