目的:使用数字图像的各种呈现来评估部分大小估计和参与者偏好的准确性。
方法:进行了两项观察性喂养研究。在两者中,每个参与者选择和食用早餐和午餐的食物,自助餐风格,为自己提供代表五种形式的九种食物的部分(例如,无定形,件)。服务容器在选择之前和之后不显眼地称重,就像板废料一样。第二天,参与者使用计算机软件程序选择代表前一天食用食物份量的照片.还收集了偏好信息。在研究1中(n=29),向参与者展示了四种不同类型的图像(航拍照片,倾斜的照片,土丘的图像,和家庭措施)和两种类型的屏幕演示(同时显示的图像与单击时充满食物部分图像的空盘子)。在研究2(n=20)中,图像以两种方式呈现,其大小(大vs小)和数量(4vs8)不同.
方法:在办公室环境中不同背景的志愿者的便利样本。
方法:通过表示方法对实际和报告的部分大小之间的绝对差异进行重复测量分析。
结果:准确性结果在很大程度上没有统计学意义,表明没有一种图像类型是最准确的。准确性结果表明,使用八张图像比使用四张图像更准确。强烈的参与者偏好支持同时呈现与连续图像。
结论:这些发现支持在自动自我管理的24小时回忆中使用航拍照片。对于某些食物形式,土丘或家庭措施的图像与食物图像一样准确,因此,是一种具有成本效益的替代食品的照片。
OBJECTIVE: To assess the accuracy of portion-size estimates and participant preferences using various presentations of digital images.
METHODS: Two observational feeding studies were conducted. In both, each participant selected and consumed foods for breakfast and lunch, buffet style, serving themselves portions of nine foods representing five forms (eg, amorphous, pieces). Serving containers were weighed unobtrusively before and after selection as was plate waste. The next day, participants used a computer software program to select photographs representing portion sizes of foods consumed the previous day. Preference information was also collected. In Study 1 (n=29), participants were presented with four different types of images (aerial photographs, angled photographs, images of mounds, and household measures) and two types of screen presentations (simultaneous images vs an empty plate that filled with images of food portions when clicked). In Study 2 (n=20), images were presented in two ways that varied by size (large vs small) and number (4 vs 8).
METHODS: Convenience sample of volunteers of varying background in an office setting.
METHODS: Repeated-measures analysis of variance of absolute differences between actual and reported portions sizes by presentation methods.
RESULTS: Accuracy results were largely not statistically significant, indicating that no one image type was most accurate. Accuracy results indicated the use of eight vs four images was more accurate. Strong participant preferences supported presenting simultaneous vs sequential images.
CONCLUSIONS: These findings support the use of aerial photographs in the automated self-administered 24-hour recall. For some food forms, images of mounds or household measures are as accurate as images of food and, therefore, are a cost-effective alternative to photographs of foods.