Lövheim Hugo, Gustafsson Maria, Isaksson Ulf, Karlsson Stig, Sandman Per-Olof
Department of Community Medicine and Rehabilitation, Geriatric Medicine, Umeå University, Umeå, Sweden.
Department of Pharmacology and Clinical Neuroscience, Clinical Pharmacology, Umeå University, Umeå, Sweden.
J Alzheimers Dis. 2019;72(4):1251-1260. doi: 10.3233/JAD-190599.
For research purposes, there is a need for tools to assess an individual's level of cognitive function. For survey-based investigations in nursing home contexts, proxy ratings allow the assessment also of individuals with severe cognitive impairment.
The aim of this study was to describe the feasibility and psychometric properties of Gottfries' cognitive scale when used in a nursing home context for proxy rating of cognitive function.
The psychometric properties of Gottfries' cognitive scale were investigated in a sample of 8,492 nursing home residents in Västerbotten County, Sweden, using item response theory and classic scale theory-based approaches.
Cognitive function could be scored in 97.1% of the assessed individuals. The scale had a negligible floor effect, it had items with a large spread in difficulties, it appeared linear, and it distributed the assessed individuals equally over the scale. Internal consistency (Cronbach's alpha) was 0.967, and an exploratory factor analysis revealed three factors of the scale - interpreted to represent orientation to time, to place, and to person.
Gottfries' cognitive scale is a feasible tool for grading cognitive function among nursing home residents using staff proxy ratings. The scale has excellent psychometric properties with a very high internal consistency, a favorable distribution of item difficulties producing an almost rectangular distribution of scores, and a negligible floor effect. The scale thus can be recommended for use in survey-based investigations in nursing home contexts.
出于研究目的，需要有工具来评估个体的认知功能水平。对于在养老院环境中基于调查的研究，代理评级也能对严重认知障碍的个体进行评估。
本研究的目的是描述在养老院环境中使用戈特弗里斯认知量表进行认知功能代理评级时的可行性和心理测量特性。
采用项目反应理论和基于经典量表理论的方法，对瑞典韦斯特博滕郡8492名养老院居民样本的戈特弗里斯认知量表的心理测量特性进行了研究。
97.1%的被评估个体能够进行认知功能评分。该量表的地板效应可忽略不计，其项目难度差异较大，呈线性，且能将被评估个体均匀分布在量表上。内部一致性（克朗巴哈系数）为0.967，探索性因素分析揭示了该量表的三个因素——解释为代表时间定向、地点定向和人物定向。
戈特弗里斯认知量表是一种可行的工具，可用于通过工作人员代理评级对养老院居民的认知功能进行分级。该量表具有出色的心理测量特性，内部一致性非常高，项目难度分布良好，得分几乎呈矩形分布，地板效应可忽略不计。因此，该量表可推荐用于养老院环境中基于调查的研究。
