EPOCH questionnaire for the study of psychological well-being of Russian adolescents: psychometric characteristics and possibilities for use

<p><strong>Context and relevance.</strong> The EPOCH questionnaire is an instrument for assessing the psychological well-being of adolescents. The results of the validation of the questionnaire and international studies have shown its good measurement ability and construct validity. The 20-item version of the questionnaire is widely used in English-speaking countries as well as in China. <strong>Objective.</strong> The purpose of this article is to evaluate the psychometric parameters of the EPOCH questionnaire and to determine the possibilities of using it to study the psychological well-being of Russian adolescents. <strong>Methods and materials.</strong> To analyze the psychometric characteristics of the questionnaire, we used the results obtained from 230 respondents aged 13 to 16 years (M = 14,65, SD = 1,04), 36,1% were boys and 63,9% were girls. The respondents were students in grades 7-9 of general education schools in a large industrial metropolis. The Success and Difficulties Questionnaire (SDQ) and the Satisfaction of Basic Psychological Needs Questionnaire were used to test construct validity. The analysis was performed using R (version 4.3.2), psych and Bifactor Indices Calculator packages. <strong>The results</strong> of the study showed that the Russian version of the questionnaire is similar to the original version in structure and includes 20 statements of self-assessment type, which allow us to assess the expression of five components of the model of psychological well-being five scales: teenager's engagement; perseverance; optimism; connectedness; happiness. The integral index of psychological well-being is determined on the basis of summarizing the values of the scales. <strong>Conclusions.</strong> The questionnaire is a reliable, convenient and compact instrument. It can be used in the research of adolescents’ psychological well-being and in practical activities in the field of developmental and educational psychology.</p>