Russell Joanna C, Flood Victoria M, Sadeghpour Ali, Gopinath Bamini, Mitchell Paul
School of Health and Society, Faculty of Social Sciences, University of Wollongong, Wollongong, NSW, Australia.
Faculty of Health Sciences, University of Sydney, Lidcombe, NSW, Australia. Email:
Asia Pac J Clin Nutr. 2017 Mar;26(2):212-219. doi: 10.6133/apjcn.122015.08.
This study aimed to determine the accuracy of a diet quality measurement tool, the Total Diet Score (TDS) using two validation methods; firstly the TDS calculated from a food frequency questionnaire (FFQ) was compared to the TDS calculated from weighed food records (WFRs); secondly the TDS was compared to a number of dietary biomarkers.
Data were collected from a population based cohort study located in the Blue Mountains region of Sydney, Australia. To compare dietary assessment tools, a sub sample of 75 subjects (aged 63 to 83 years) completed the FFQ and three, four-day WFRs at baseline. Fasting blood samples were collected from 2897 subjects at the first follow up in 1997-1999. TDS scores were calculated from both WFRs and FFQs. Methods to compare FFQ TDS scores to WFR TDS scores included paired t-tests, Pearson correlations, Bland-Altman plots, joint classification quartiles and weighted kappa scores. Linear regression analyses were used to assess the relationship between TDS and biomarkers.
No significant mean difference was found between FFQ TDS and WFRs TDS (p=0.63) with a significant positive correlation seen between the two methods (r=0.75, p<0001). The Bland-Altman method found no linear trend between the differences and means of TDS scores between the FFQ and WFR (p=0.38). A significant trend for higher serum vitamin B-12, serum folate, homocysteine and lower total cholesterol was found with increasing TDS.
These findings suggest that the TDS is a useful tool for assessing diet quality in an older population.
本研究旨在通过两种验证方法确定一种饮食质量测量工具——总饮食评分（TDS）的准确性；首先，将根据食物频率问卷（FFQ）计算得出的TDS与根据称重食物记录（WFR）计算得出的TDS进行比较；其次，将TDS与多种膳食生物标志物进行比较。
数据收集自澳大利亚悉尼蓝山地区的一项基于人群的队列研究。为比较膳食评估工具，75名受试者（年龄在63至83岁之间）的子样本在基线时完成了FFQ和三份为期四天的WFR。1997 - 1999年首次随访时，从2897名受试者中采集了空腹血样。TDS分数通过WFR和FFQ计算得出。将FFQ TDS分数与WFR TDS分数进行比较的方法包括配对t检验、Pearson相关性分析、Bland - Altman图、联合分类四分位数和加权kappa分数。采用线性回归分析评估TDS与生物标志物之间的关系。
FFQ TDS与WFR TDS之间未发现显著的平均差异（p = 0.63），两种方法之间存在显著的正相关（r = 0.75，p < 0.001）。Bland - Altman方法发现FFQ和WFR之间TDS分数的差异与均值之间无线性趋势（p = 0.38）。随着TDS升高，血清维生素B - 12、血清叶酸、同型半胱氨酸升高以及总胆固醇降低存在显著趋势。
这些发现表明TDS是评估老年人群饮食质量的有用工具。
