Obesity Research Center, Research Institute for Endocrine Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
J Epidemiol. 2010;20(2):150-8. doi: 10.2188/jea.je20090083. Epub 2010 Feb 13.
To examine the validity and reproducibility of food groups in the semi-quantitative food frequency questionnaire (FFQ) developed for the Tehran Lipid and Glucose Study (TLGS).
To evaluate the reproducibility of food groups included in the FFQ, 132 subjects (61 men and 71 women) aged 20 years or older twice completed a 168-item FFQ (FFQ1, FFQ2), with a 14-month interval between FFQ1 and FFQ2. Over the 1-year interval, 12 dietary recalls (DRs) were collected (1 each month) to assess the validity of the FFQ. Seventeen food groups were derived from the FFQ based on methods described in previous studies. Age-adjusted and deattenuated Spearman correlation coefficients were used to assess the validity of the FFQ.
The mean (SD) age and body mass index of subjects were 35.5 (16.8) years and 25.5 (5.2) kg/m(2), respectively. Validity correlation coefficients ranged from 0.03 (liquid oil) to 0.77 (simple sugars) in men (median, 0.44), and from 0.12 (snacks) to 0.79 (simple sugars) in women (median, 0.37). The energy-adjusted intraclass correlation coefficient, which reflects the reproducibility of the FFQ, was 0.51 in men and was highest for tea and coffee (0.91); in women it was 0.59 and was highest for simple sugars (0.74). The highest percentage of complete agreement and disagreement was observed for snacks and desserts (60.6%) and potatoes and dairy products (12.8%), respectively, in men, and tea and coffee (62.9%) and legumes (15.7%) in women.
The FFQ that was designed for the TLGS was found to be reliable and valid for assessing the intake of several food groups.
检验半定量食物频率问卷（FFQ）中食物组的有效性和可重复性，该问卷是为德黑兰血脂和血糖研究（TLGS）开发的。
为了评估 FFQ 中包含的食物组的可重复性，年龄在 20 岁及以上的 132 名受试者（61 名男性和 71 名女性）两次完成了 168 项的 FFQ（FFQ1、FFQ2），两次之间间隔 14 个月。在 1 年的时间间隔内，共收集了 12 份饮食记录（DR）（每月 1 份），以评估 FFQ 的有效性。根据先前研究中描述的方法，从 FFQ 中得出了 17 种食物组。采用年龄调整和去衰减 Spearman 相关系数评估 FFQ 的有效性。
受试者的平均（SD）年龄和体重指数分别为 35.5（16.8）岁和 25.5（5.2）kg/m2。男性的有效性相关系数范围为 0.03（液体油）至 0.77（简单糖）（中位数，0.44），女性为 0.12（零食）至 0.79（简单糖）（中位数，0.37）。反映 FFQ 可重复性的能量调整组内相关系数男性为 0.51，最高的是茶和咖啡（0.91）；女性为 0.59，最高的是简单糖（0.74）。男性中完全一致和不一致的最高比例出现在零食和甜点（60.6%）和土豆和乳制品（12.8%），女性中则出现在茶和咖啡（62.9%）和豆类（15.7%）。
为 TLGS 设计的 FFQ 被发现是可靠和有效的，可用于评估几种食物组的摄入量。
