University of Guelph, Guelph, Ontario, Canada.
Soc Sci Med. 2010 May;70(10):1574-80. doi: 10.1016/j.socscimed.2010.01.037. Epub 2010 Feb 12.
This study aims to measure the difficulty of healthy eating as a single latent construct and, within that, assess which dietary guidelines consumers find more or less difficult to comply with using the Rasch model approach. Participants self-reported their compliance with 12 health-promoting dietary recommendations related to cooking methods and consumption of specific food items. Data were drawn from a survey elicited using a longitudinal consumer panel established in the City of Guelph, Ontario, Canada in 2008. The panel consists of 1962 randomly-selected residents of Guelph between the age of 20 and 69 years. The response rate was equal to 68 percent. The main assumptions of the Rasch model were satisfied. However, subsequent differential item functioning analysis revealed significant scale variations by gender, education, age and household income, which reduced the validity of the Rasch scale. Conversely, these scale variations highlight the importance of socio-economic and demographic factors on the difficulty of healthy eating.
本研究旨在衡量健康饮食的难度作为单一潜在结构，并在其中评估消费者认为哪些饮食指南更难或更容易遵守，使用 Rasch 模型方法。参与者自我报告了他们对 12 项与烹饪方法和特定食物消费相关的促进健康的饮食建议的遵守情况。数据来自于 2008 年在加拿大安大略省圭尔夫市使用纵向消费者小组进行的一项调查。该小组由 1962 名年龄在 20 至 69 岁之间的圭尔夫随机居民组成。响应率等于 68%。Rasch 模型的主要假设得到满足。然而，随后的差异项目功能分析显示性别、教育、年龄和家庭收入对量表有显著的差异，降低了 Rasch 量表的有效性。相反，这些规模变化突出了社会经济和人口因素对健康饮食难度的重要性。
