Hendrie Gilly A, Rebuli Megan A, Golley Rebecca K
CSIRO Food and Nutrition Flagship, Adelaide, South Australia, Australia.
Department of Nutrition and Dietetics, Flinders University, Adelaide, South Australia, Australia.
Nutr Diet. 2017 Jul;74(3):291-297. doi: 10.1111/1747-0080.12303. Epub 2016 Sep 14.
Assess the reliability and relative validity of a diet index score for adults derived using a 38-item online survey.
The short food survey (SFS) measured 'usual' intake of seven food groups, three food choice indicators and variety; and was completed by 61 adults aged 19-50 years from Adelaide, Australia. A score was applied to assess compliance with the 2013 Australian Dietary Guidelines. Reliability of the survey was measured between two administrations one week apart; and validity by comparing the first administration to the average of three 24-hour dietary recalls. Statistical analyses included paired samples t-tests, intra-class correlation coefficient (ICC), percentage agreement, Cohen's kappa coefficients and Bland-Altman plots.
Estimates of daily food group servings were reliable (within 0.3 servings, P > 0.05) but not valid for all foods groups. The mean total index score was approximately 70 points (out of 100) on both SFS administrations (ICC = 0.71 (95% CI 0.56:0.81). Relative validity analysis showed moderate correlation between SFS#1 and 24-hour recalls (ICC = 0.43 (0.21:0.62, P < 0.001)), with 51% agreement in allocation to tertiles of diet quality between methods (k = 0.262, P = 0.004). The survey overestimated the diet index score by an average of 12.7 points out of 100 [-20.11:42.94] in comparison to recalls.
The survey overestimated compliance with guidelines relative to dietary recalls. It demonstrated good reliability; however, the validity of estimating intake of some food groups needs improvement. Future refinement will provide a valuable online tool to assess compliance with the Australian dietary recommendations.
评估通过一项包含38个项目的在线调查得出的成人饮食指数评分的可靠性和相对有效性。
简短食物调查（SFS）测量了七个食物组的“通常”摄入量、三个食物选择指标和食物种类多样性；由来自澳大利亚阿德莱德的61名年龄在19至50岁的成年人完成。应用一个评分来评估对2013年澳大利亚膳食指南的遵守情况。在相隔一周的两次调查中测量该调查的可靠性；通过将第一次调查结果与三次24小时饮食回顾的平均值进行比较来评估有效性。统计分析包括配对样本t检验、组内相关系数（ICC）、百分比一致性、科恩kappa系数和布兰德 - 奥特曼图。
每日食物组份数的估计是可靠的（相差在0.3份以内，P>0.05），但并非对所有食物组都有效。在两次SFS调查中，总指数评分的平均值约为70分（满分100分）（ICC = 0.71（95%CI 0.56:0.81））。相对有效性分析显示SFS#1与24小时饮食回顾之间存在中度相关性（ICC = 0.43（0.21:0.62，P<0.001）），两种方法在饮食质量三分位数分配上的一致性为51%（k = 0.2,62，P = 0.004）。与饮食回顾相比，该调查高估了饮食指数评分，平均高出100分中的12.7分[-20.11:42.94]。
相对于饮食回顾，该调查高估了对指南的遵守情况。它显示出良好的可靠性；然而，估计某些食物组摄入量的有效性需要改进。未来的改进将提供一个有价值的在线工具来评估对澳大利亚膳食建议的遵守情况。
