The Centre for Activity and Eating Research,Bangor University,School of Psychology,Brigantia,Penrallt Road,Bangor,Gwynedd,LL57 2AS,UK.
Public Health Nutr. 2019 Jul;22(10):1745-1754. doi: 10.1017/S136898001900048X. Epub 2019 Apr 4.
The present study tested the validity of a digital image-capture measure of food consumption suitable for use in busy school cafeterias.
Lunches were photographed pre- and post-consumption, and food items were weighed pre- and post-consumption for comparison.
A small research team recorded children's lunchtime consumption in one primary and one secondary school over seven working days.ParticipantsA primary-school sample of 121 children from North Wales and a secondary-school sample of 124 children from the West Midlands, UK, were utilised. Nineteen children were excluded because of incomplete data, leaving a final sample of 239 participants.
Results indicated that (i) consumption estimates based on images were accurate, yielding only small differences between the weight- and image-based judgements (median bias=0·15-1·64 g, equating to 0·45-3·42 % of consumed weight) and (ii) good levels of inter-rater agreement were achieved, ranging from moderate to near perfect (Cohen's κ=0·535-0·819). This confirmed that consumption estimates derived from digital images were accurate and could be used in lieu of objective weighed measures.
Our protocol minimised disruption to daily lunchtime routine, kept the attrition low, and enabled better agreement between measures and raters than was the case in the existing literature. Accurate measurements are a necessary tool for all those engaged in nutrition research, intervention evaluation, prevention and public health work. We conclude that our simple and practical method of assessment could be used with children across a range of settings, ages and lunch types.
本研究旨在验证一种适用于繁忙学校自助餐厅的食物摄入量数字图像采集测量方法的有效性。
在进食前后拍摄午餐照片，并对食物进行称重，以作比较。
一个由北威尔士的一所小学和英国西米德兰兹的一所中学组成的小型研究团队在七个工作日内记录了孩子们的午餐时间摄入量。
北威尔士一所小学的 121 名儿童和西米德兰兹一所中学的 124 名儿童被纳入研究。有 19 名儿童因数据不完整而被排除在外，最终共有 239 名参与者进入分析。
结果表明：（i）基于图像的消费估计值是准确的，仅在重量和图像判断之间存在微小差异（中位数偏差=0.15-1.64 克，相当于所消耗重量的 0.45-3.42%）；（ii）实现了良好的评分者间一致性，范围从中度到近乎完美（Cohen's κ=0.535-0.819）。这证实了从数字图像得出的消费估计值是准确的，可以替代客观的称重测量。
我们的方案最大限度地减少了对日常午餐时间的干扰，降低了失访率，并使测量值和评分者之间的一致性优于现有文献中的情况。准确的测量值是从事营养研究、干预评估、预防和公共卫生工作的必要工具。我们得出结论，我们简单实用的评估方法可用于不同环境、年龄和午餐类型的儿童。
