Certain aspects of using Z-score to assess cognitive disorders
https://doi.org/10.21292/2078-5658-2020-17-5-25-30
Abstract
Detailed psychological testing is needed to identify cognitive impairments after anesthesia and surgery. This problem can be solved by development of the program of combination psychological tests with their assessment based on the Z-score, also known as the standard deviation test.
The objective: to determine reference values of psychological tests to assess the results of Z-score.
Subjects and methods. The study was included 30 healthy volunteers and 43 patients who underwent surgery. The panel of psychological tests consisted of the clock drawing test, oral counting test, assessment of short-term memory, sequence set, Digit Symbol Substitution Test, and the classic Stroop test. The mean values and standard deviations were calculated for each of the groups to evaluate the test results by Z-score.
Results. It was found that using standard deviations obtained in the group of healthy volunteers as reference values for Z-score resulted in a higher percentage of deterioration in the result of repeated tests compared to using reference values obtained in group of patients.
Conclusion: When using Z-score for cognitive tests, it is better to use the means and SD obtained in a group of healthy volunteers taking into account the possibility of finding differences where there are none (type I error).
About the Authors
V. V. Subbotin
A. S. Loginov Moscow Clinical Scientific Center
Russian Federation
Russian Federation
Valery V. Subbotin Doctor of Mathematical Sciences, Head of Anesthesiology and Intensive Care Center
86, Entuziastov Highway, Moscow, 111123
Phone: +7 (495) 304‒30‒39
I. N. Dushin
A. S. Loginov Moscow Clinical Scientific Center
Russian Federation
Russian Federation
Ivan N. Dushin Anesthesiologist and Emergency Physician of Anesthesiology and Intensive Care Department no. 1
86, Entuziastov Highway, Moscow, 111123
S. A. Kamnev
A. S. Loginov Moscow Clinical Scientific Center
Russian Federation
Russian Federation
Sergey A. Kamnev Anesthesiologist and Emergency Physician of Anesthesiology and Intensive Care Department no. 1
86, Entuziastov Highway, Moscow, 111123
A. Yu. Аntipov
A. S. Loginov Moscow Clinical Scientific Center
Russian Federation
Russian Federation
Artem Yu. Аntipov Anesthesiologist and Emergency Physician of Anesthesiology and Intensive Care Department no. 1
86, Entuziastov Highway, Moscow, 111123
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Review
For citations:
Subbotin V.V., Dushin I.N., Kamnev S.A., Аntipov A.Yu. Certain aspects of using Z-score to assess cognitive disorders. Messenger of ANESTHESIOLOGY AND RESUSCITATION. 2020;17(5):25-30. (In Russ.) https://doi.org/10.21292/2078-5658-2020-17-5-25-30
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