Postgraduate Program in Food and Nutrition, Department of Nutrition, Federal University of Paraná (UFPR), Curitiba 80240-110, Brazil.
Postgraduate Program in Epidemiology, Department of Statistics, Federal University of Rio Grande do Sul (UFRGS), Porto Alegre 91509-900, Brazil.
Nutrients. 2019 Feb 27;11(3):501. doi: 10.3390/nu11030501.
Although digital photos have the potential to improve the precision of reported portions in dietary assessment, there are few studies investigating its accuracy in comparison to printed photos. The aim of this study was to evaluate the perception of adults in quantifying food portion sizes using printed and digital photos, displayed on computer-screens and tablets. In total, 1165 evaluations were performed for 60 photos of portion sizes in Brazil. Each participant ( = 58) attended two sessions in the study center, with an interval of at least one week. In each session, twelve food portions were prepared and randomly evaluated by each participant in its printed and digital forms. The mean error (difference between the estimated and true portions) was not significantly different between the printed photos (2.1 g ± 47.2) and the digital ones (-6.4 g ± 53.7). The agreement on using the printed and digital photos was 91% and 90%, respectively. Furthermore, the use of the tablet was more prone to underestimation when compared to printed and computer-screen photos ( < 0.001). Overall, participants did not present major difficulties in perceiving the portion sizes using the printed and digital photos, but the use of tablets led to less accurate results, indicating that this needs to be further evaluated.
尽管数字照片有可能提高膳食评估中报告份量的精度，但很少有研究将其与打印照片的准确性进行比较。本研究的目的是评估成年人使用计算机屏幕和平板电脑上显示的打印和数字照片来量化食物份量的感知能力。总共对巴西 60 张份量照片进行了 1165 次评估。每位参与者（n=58）在研究中心参加了两次会议，两次会议之间至少间隔一周。在每次会议中，准备了十二种食物份量，并由每位参与者以打印和数字形式随机进行评估。打印照片（2.1 克±47.2）和数字照片（-6.4 克±53.7）之间的平均误差（估计和真实份量之间的差异）没有显著差异。使用打印和数字照片的一致性分别为 91%和 90%。此外，与打印和计算机屏幕照片相比，平板电脑的使用更容易出现低估（<0.001）。总体而言，参与者在使用打印和数字照片感知份量方面没有遇到重大困难，但平板电脑的使用导致结果不够准确，这需要进一步评估。
