ANALYSIS OF PSYCHOMETRIC PROPERTIES OF METHODS "ESSENTIAL FEATURES", "SIMPLE ANALOGIES", "DIFFICULT ANALOGIES" USED TO ASSESS THOUGHT DISORDER IN PATIENTS WITH SCHIZOPHRENIA

Background. Psychometric standardization of diagnostic methods is an actual trend in modern medical psychology. The purpose of this study was to carry out the Rasch analysis of psychometric properties of the methods "Essential features", "Simple analogies", "Difficult analogies" used to assess thought disorder in patients with schizophrenia. Material and methods. The study involved 122 patients. All the patients met criteria for schizophrenia. The difficulty of questions was considered, construct validity was estimated, reliability coefficients and discriminative index were calculated. Results. The method "Essential features" was regenerated into 9-items, as a result an optimal combination of psychometric indices was obtained. All the stages of the analysis of the "Simple analogy" and "Difficult analogy" methods revealed a discrepancy between some indicators and psychometric requirements. Conclusion. The possibility of using these techniques will be determined by the results of evaluation of their consistency with clinical data.