Clinical Utility of the Cognitive Test for Severe Dementia: Factor Analysis, Minimal Detectable Change, and Longitudinal Changes

• Main Authors: Hiroyuki Tanaka, Yuma Nagata, Daiki Ishimaru, Yasuhiro Ogawa, Keita Fukuhara, Takashi Nishikawa
• Format: Article
• Language: English
• Published: Karger Publishers 2018-06-01
• Series: Dementia and Geriatric Cognitive Disorders Extra
• Subjects: COSMIN checklist; Severe dementia; Cognitive function test
• Online Access: https://www.karger.com/Article/FullText/488937

Aims: This study sought to conduct additional analyses of the Cognitive Test for Severe Dementia (CTSD) using the COSMIN checklist to ensure the development of adequate outcome measures. Methods: The following analyses were conducted: (1) factor analyses were used to evaluate construct validity; (2) the standard error of measurement (SEM) and minimal detectable change (MDC) were assessed to evaluate reliability and interpretability; and (3) longitudinal change was assessed to evaluate responsiveness. Results: The CTSD factor analysis yielded 2 factors, each of which was dichotomized by the passage rate of each item. We calculated a SEM and MDC of 1.6 and 3.6 points, respectively. Finally, the mean CTSD score showed a significant reduction (p < 0.001) over time, and the change in score exceeded the SEM and MDC. Conclusion: Our results indicate that the CTSD could provide a reliable outcome measure in severe dementia.