Block G, Woods M, Potosky A, Clifford C
Division of Cancer Prevention and Control, National Cancer Institute, Bethesda, MD 20892.
J Clin Epidemiol. 1990;43(12):1327-35. doi: 10.1016/0895-4356(90)90099-b.
The validity of a self-administered diet history questionnaire has been estimated using as the reference data the mean of three 4-day diet records collected over the year prior to the administration of the questionnaire, in 1985-1986. Subjects were women ages 45-70 years, participants in the Women's Health Trial Feasibility Study, a multi-center clinical trial in which some women were randomized to be taught to adopt and maintain a low-fat diet, while others maintained their usual diet. The questionnaire produced group mean nutrient estimates closely approximating the values obtained by three 4-day records, e.g. in the usual-diet group, 37.7% of calories from fat by both food records and by questionnaire, and in the low-fat group, 21.3% of calories from fat by food records and 23.7% of calories from fat by questionnaire. Correlations between questionnaire and diet records for per cent of calories from fat were 0.67 and 0.65 respectively in the two groups; most correlations were in the 0.5-0.6 range, and were similar to those achievable by a single 4-day food record.
1985 - 1986年，通过将一份自行填写的饮食史问卷的有效性与在该问卷发放前一年收集的三份为期4天的饮食记录的均值作为参考数据进行评估。研究对象为45 - 70岁的女性，她们是女性健康试验可行性研究的参与者，这是一项多中心临床试验，其中一些女性被随机分配去学习采用并维持低脂饮食，而其他女性则保持她们的日常饮食。该问卷得出的组平均营养素估计值与通过三份为期4天的记录所获得的值非常接近，例如，在日常饮食组中，饮食记录和问卷得出的来自脂肪的热量占比均为37.7%；在低脂组中，饮食记录得出的来自脂肪的热量占比为21.3%，问卷得出的为23.7%。两组中问卷与饮食记录在来自脂肪的热量占比方面的相关性分别为0.67和0.65；大多数相关性在0.5 - 0.6范围内，并且与通过一份为期4天的饮食记录所能达到的相关性相似。
