Klipstein-Grobusch K, den Breeijen J H, Goldbohm R A, Geleijnse J M, Hofman A, Grobbee D E, Witteman J C
Department of Epidemiology & Biostatistics, Erasmus University Medical School, Rotterdam, The Netherlands.
Eur J Clin Nutr. 1998 Aug;52(8):588-96. doi: 10.1038/sj.ejcn.1600611.
The study was conducted to assess the relative validity of a 170-item semiquantitative food frequency questionnaire (SFFQ) adapted for use in the elderly.
The study was carried out in a sample of 80 men and women aged 55-75 y participating in a community based prospective cohort study in Rotterdam, The Netherlands. The two-step dietary assessment comprised a simple self-administered questionnaire (20 min) followed by a structured interview with trained dietitians (20 min) based on the completed questionnaire. Multiple food records (FR) collected over a one year period served as reference method. 24 h urine urea was used as indirect marker for protein intake.
Compared with FR, the SFFQ generally overestimated nutrient intake as reflected by difference in means and the ratio of SFFQ to FR. Energy adjustment reduced the observed overestimation. Pearson's correlation coefficients varied from close to 0.5 to about 0.9 for crude data, and after adjustment for age, sex, total energy intake, and for within-person variability in daily intake for 0.4-0.8. Cross-classification into quintiles resulted in correct classification into the same or adjacent quintile of 75.8% for crude and 76.8% for energy-adjusted data. Validation of protein intake estimated by SFFQ with protein excretion from 24h urine urea indicated overestimation of protein intake by SFFQ. Spearman correlation coefficient between protein intake estimated from urea excretion and SFFQ was 0.67.
Adaptation of a SFFQ for use in the elderly resulted in a valid and time-efficient dietary assessment instrument. Its ability to adequately rank study subjects according to their dietary intake support its application in epidemiological studies in the elderly.
本研究旨在评估一份适用于老年人的包含170个条目的半定量食物频率问卷（SFFQ）的相对效度。
本研究以荷兰鹿特丹一项基于社区的前瞻性队列研究中的80名年龄在55 - 75岁的男性和女性为样本。两步饮食评估包括一份简单的自填式问卷（20分钟），随后是基于完成的问卷对经过培训的营养师进行的结构化访谈（20分钟）。在一年时间内收集的多份食物记录（FR）作为参考方法。24小时尿尿素用作蛋白质摄入量的间接标志物。
与食物记录相比，SFFQ通常高估了营养素摄入量，这体现在均值差异以及SFFQ与食物记录的比值上。能量调整减少了观察到的高估现象。原始数据的皮尔逊相关系数从接近0.5到约0.9不等，在对年龄、性别、总能量摄入量以及个体每日摄入量的变异性进行调整后，相关系数为0.4 - 0.8。交叉分类为五分位数后，原始数据中有75.8%、能量调整后的数据中有76.8%被正确分类到相同或相邻的五分位数。用24小时尿尿素排泄量对SFFQ估计的蛋白质摄入量进行验证，结果表明SFFQ高估了蛋白质摄入量。根据尿素排泄量估计的蛋白质摄入量与SFFQ之间的斯皮尔曼相关系数为0.67。
将一份SFFQ改编用于老年人，得到了一种有效且省时的饮食评估工具。它能够根据研究对象的饮食摄入量对其进行充分排序，这支持了它在老年人群流行病学研究中的应用。
