Mohammadifard Noushin, Omidvar Nasrin, Houshiarrad Anahita, Neyestani Tirang, Naderi Gholam-Ali, Soleymani Bahram
MSc in Nutrition, Department of Nutrition, Isfahan Cardiovascular Research Institute, Isfahan University of Medical Sciences, Isfahan, Iran.
J Res Med Sci. 2011 Oct;16(10):1286-97.
This study's aim was to design and validate a semi-quantitative food frequency questionnaire (FFQ) for assessment of fruits and vegetables (FV) consumption in adults of Isfahan by comparing the FFQ with dietary reference method and blood plasma levels of beta-carotene, vitamin C, and retinol.
This validation study was performed on 123 healthy adults of Isfahan. FV intake was assessed using a 110-item FFQ. Data collection was performed during two different time periods to control for seasonal effects, fall/winter (cold season) and spring/summer (warm season). In each phase a FFQ and 1 day recall, and 2 days of food records as the dietary reference method were completed and plasma vitamin C, beta-carotene and retinol were measured. Data was analyzed by Pearson or Spearman and intraclass correlations.
Serum Lipids, sex, age, body mass index (BMI) and educational level adjusted Pearson correlation coefficient of FV with plasma vitamin C, beta-carotene and retinol were 0.55, 0.47 and 0.28 in the cold season (p < 0.05) and 0.52, 0.45 and 0.35 in the warm season (p < 0.001), respectively. Energy and fat intake, sex, age, BMI and educational level adjusted Pearson correlation coefficient for FV with dietary reference method in the cold and warm seasons were 0.62 and 0.60, respectively (p < 0.001). Intraclass correlation for reproducibility of FFQ in FV was 0.65 (p<0.001).
The designed FFQ had a good criterion validity and reproducibility for assessment of FV intake. Thus, it can serve as a valid tool in epidemiological studies to assess fruit and vegetable intake.
本研究旨在设计并验证一份半定量食物频率问卷（FFQ），通过将该问卷与膳食参考方法以及血浆中β-胡萝卜素、维生素C和视黄醇水平进行比较，来评估伊斯法罕成年人的水果和蔬菜（FV）摄入量。
本验证研究在123名伊斯法罕健康成年人中进行。使用一份包含110个条目的FFQ评估FV摄入量。在两个不同时间段进行数据收集，以控制季节效应，即秋冬（寒冷季节）和春夏（温暖季节）。在每个阶段，均完成一份FFQ、1天的饮食回顾以及作为膳食参考方法的2天食物记录，并测量血浆维生素C、β-胡萝卜素和视黄醇。通过Pearson或Spearman相关性分析以及组内相关性分析数据。
在寒冷季节，经血清脂质、性别、年龄、体重指数（BMI）和教育水平调整后，FV与血浆维生素C、β-胡萝卜素和视黄醇的Pearson相关系数分别为0.55、0.47和0.28（p<0.05）；在温暖季节，相应的相关系数分别为0.52、0.45和0.35（p<0.001）。在寒冷和温暖季节，经能量和脂肪摄入量、性别、年龄、BMI和教育水平调整后，FV与膳食参考方法的Pearson相关系数分别为0.62和0.60（p<0.001）。FFQ在FV摄入量方面的可重复性组内相关系数为0.65（p<0.001）。
所设计的FFQ在评估FV摄入量方面具有良好的标准效度和可重复性。因此，它可作为流行病学研究中评估水果和蔬菜摄入量的有效工具。
