DOI: https://doi.org/10.22263/2312-4156.2025.5.78
V.A. Korzun1, A.A. Lakutin2, T.A. Emelyantseva3
The psychometric assessment results of the Russian version of the Cognitive test for severe dementia
1Borisov Central District Hospital, Borisov, Republic of Belarus
2National Science and Practice Centre of Medical Assessment and Rehabilitation, village Yukhnovka, Minsk region, Republic of Belarus
3Belarusian State Medical University, Minsk, Republic of Belarus
Vestnik VGMU. 2025;24(5):78-86.
Abstract.
Objectives. To adapt the Russian version of the Cognitive Test for Severe Dementia (CTSD–Rus) using psychometric indicators (reliability, validity).
Material and methods. The CTSD scale was translated directly and back-translated with cultural adaptation and approval from the author of the original CTSD. The study involved 118 patients (mean age 66±11.2 years) with dementia of various etiologies and severity living in a nursing home. Cognitive status was assessed using neuropsychological scales: CTSD-Rus, MMSE, MoCA, CDR. To assess reliability (inter-expert and test-retest), subgroups of patients (N=54 and N=52, respectively) with CDR≥3 and MMSE<10 were selected. The following coefficients were calculated: Cronbach’s alpha, intraclass correlation coefficient (ICC), Spearman’s rank correlation coefficient. The study was approved by the biomedical ethics committee of the Republican Scientific and Practical Center for Medical Examination and Rehabilitation (No. 1/2 dated January 7, 2022).
Results. CTSD-Rus showed high internal consistency (Cronbach’s alpha = 0.94). Inter-rater and test-retest reliability for most items and the total score was excellent (ICC>0.75; r>0.9). The high validity of CTSD-Rus was established, which is confirmed by a significant correlation with the MMSE and MoCA scales (r=0.893 and r=0.856, respectively) for the entire sample and the sample with severe dementia at CDR≥3 (r=0.758 and r=0.681, respectively). With zero MMSE and MoCA values, the use of CTSD-Rus shows a spread of scores (5.9±7.1 and 8.83±6.3, respectively), which allows for a more in-depth assessment of preserved cognitive functions.
Conclusions. The study showed that CTSD-Rus is primarily focused on patients with severe and more than severe dementia and can be used by researchers and healthcare professionals for a detailed assessment of preserved cognitive functions in this category of patients.
Keywords: neuropsychological scales, dementia, validity, reliability, cognitive functions.
Sources of funding. The work was carried out as part of the research project «Develop a method of medical rehabilitation and a procedure for assessing the limitations of daily life in patients with Alzheimer’s disease» (Reg. No. NIOKTR 20220628 dated 25.04.2022); completion date 2024-2029.
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Submitted 10.06.2025
Accepted 21.10.2025
Information about authors:
V.A. Korzun – psychiatrist-narcologist, Borisov Central District Hospital, https://orcid.org/0009-0007-6625-5750;
Anton A. Lakutin – research officer of the laboratory of medical assessment and rehabilitation in psychiatric and behavioral disorders, National Science and Practice Centre of Medical Assessment and Rehabilitation, https://orcid.org/0009-0009-3694-8446, e-mail: Этот адрес электронной почты защищён от спам-ботов. У вас должен быть включен JavaScript для просмотра.
T.A. Emelyantseva – Doctor of Medical Sciences, associate professor, professor of the chair of Psychiatry, Narcology, Psychotherapy and Medical Psychology with the course of the Faculty for Advanced Training & Retraining, Belarusian State Medical University, https://orcid.org/0009-0000-2861-0829
