Naska Androniki, Valanou Elisavet, Peppa Eleni, Katsoulis Michail, Barbouni Anastasia, Trichopoulou Antonia
1Department of Hygiene,Epidemiology and Medical Statistics,School of Medicine,National and Kapodistrian University of Athens,Athens,Greece.
2Hellenic Health Foundation,Kaisareias 13 & Alexandroupoleos,GR-115 27 Athens,Greece.
Public Health Nutr. 2016 Sep;19(13):2369-76. doi: 10.1017/S1368980016000227. Epub 2016 Feb 26.
To evaluate how well respondents perceive digital images of food portions commonly consumed in Greece.
The picture series was defined on the basis of usual dietary intakes assessed in earlier large-scale studies in Greece. The evaluation included 2218 pre-weighed actual portions shown to participants, who were subsequently asked to link each portion to a food picture. Mean differences between picture numbers selected and portions actually shown were compared using the Wilcoxon paired signed-rank test. The effect of personal characteristics on participants' selections was evaluated through unpaired t tests (sex and school years) or through Tukey-Kramer pairwise comparisons (age and food groups).
Testing of participants' perception of digital food images used in the Greek national nutrition survey.
Individuals (n 103, 61 % females) aged 12 years and over, selected on the basis of the target population of the Greek nutrition survey using convenience sampling.
Individuals selected the correct or adjacent image in about 90 % of the assessments and tended to overestimate small and underestimate large quantities. Photographs of Greek traditional pies and meat-based pastry dishes led participants to perceive the amounts in the photos larger than they actually were. Adolescents were more prone to underestimating food quantities through the pictures.
The digital food atlas appears generally suitable to be used for the estimation of average food intakes in large-scale dietary surveys in Greece. However, individuals who consistently consume only small or only large food portions may have biased perceptions in relation to others.
评估受访者对希腊常见食用食物份量的数字图像的认知程度。
图片系列是根据希腊早期大规模研究中评估的通常饮食摄入量确定的。评估包括向参与者展示2218份预先称重的实际份量，随后要求他们将每份份量与一张食物图片进行匹配。使用Wilcoxon配对符号秩检验比较所选图片编号与实际展示份量之间的平均差异。通过未配对t检验（性别和学年）或Tukey-Kramer两两比较（年龄和食物类别）评估个人特征对参与者选择的影响。
对希腊国家营养调查中使用的数字食物图像的参与者认知进行测试。
基于希腊营养调查的目标人群，采用便利抽样法选取12岁及以上的个体（n = 103，61%为女性）。
在大约90%的评估中，个体选择了正确或相邻的图像，并且倾向于高估小份量而低估大份量。希腊传统馅饼和肉类糕点菜肴的照片使参与者认为照片中的份量比实际份量更大。青少年更容易通过图片低估食物份量。
数字食物图谱似乎总体上适合用于希腊大规模饮食调查中平均食物摄入量的估计。然而，持续只食用小份量或大份量食物的个体与其他人相比可能存在有偏差的认知。
