1 University of Maryland School of Nursing, Baltimore, MD, USA.
2 Pennsylvania State University, State College, PA, USA.
Am J Alzheimers Dis Other Demen. 2018 Aug;33(5):277-283. doi: 10.1177/1533317518765133. Epub 2018 Mar 25.
BACKGROUND/RATIONALE: This study tested the psychometric properties of the Quality of Life in Late-Stage Dementia (QUALID) Scale using Rasch analysis. The QUALID includes 11 items with a 5-point response scale. Scores range from 11 to 55, and lower scores indicate higher quality of life (QoL).
Baseline data from a randomized clinical trial including 137 residents from 14 nursing homes were used. Psychometric testing included item mapping, evaluation of response categories, item reliability, construct validity based on INFIT and OUTFIT statistics, and convergent validity based on correlations between QoL and pain, agitation, depression, and function.
The Cronbach α was .89. All the items except "appears physically uncomfortable" fit the model. There was a significant relationship between QoL and depressive symptoms ( r = .71, P = .001), pain ( r = .26, P = .01), physical function ( r = -.19, P = .03), and agitation ( r = .56, P = .001). The categories were appropriately used. Item mapping suggested a need for easier items.
背景/原理：本研究使用 Rasch 分析测试了晚期痴呆患者生活质量（QUALID）量表的心理计量学特性。QUALID 包括 11 个项目，采用 5 点反应量表。分数范围为 11 至 55，分数越低表示生活质量越高（QoL）。
使用了一项随机临床试验的基线数据，该试验纳入了来自 14 家养老院的 137 名居民。心理计量学测试包括项目映射、反应类别评估、项目可靠性、基于 INFIT 和 OUTFT 统计的结构有效性，以及基于 QoL 与疼痛、激越、抑郁和功能之间相关性的收敛有效性。
Cronbach α 为.89。除了“看起来身体不适”之外，所有项目都符合模型。生活质量与抑郁症状（r =.71，P =.001）、疼痛（r =.26，P =.01）、身体功能（r = -.19，P =.03）和激越（r =.56，P =.001）之间存在显著关系。类别得到了适当的使用。项目映射表明需要更简单的项目。
