Psychometric Properties of the Adolescent Identity Instability Questionnaire
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Objective: The present study was conducted to examine the psychometric properties of the Identity Instability Questionnaire in adolescents with self-injurious behavior.
Methods and Materials: The present study was fundamental (basic) in purpose, developmental in its methodological approach, and psychometric in nature. The statistical population in the present study consisted of all male and female students of the second grade of public schools with self-injurious behavior in Gonbad-Kavos city in the academic year 2024-25. Of which 315 people (200 girls and 115 boys) were selected non-randomly and purposefully. The Lechner Identity Hyperstability Questionnaire (2023) was used to collect data. Data analysis included mean, standard deviation, confirmatory factor analysis, and convergent validity and reliability using SPSS 28 and SMART PLS 3 statistical software.
Findings: Confirmatory factor analysis showed that the measurement model of the Identity Instability Scale with 20 items had a good fit. The factor loading of all items was higher than 0.50, the composite reliability and Cronbach's alpha were higher than 0.70, and the convergent validity was higher than 0.50. The results of the item analysis method showed that the items had an appropriate degree of difficulty and had a normal distribution.
Conclusion: The results of this study indicated the suitability of the psychometric properties of the Identity Instability Questionnaire for use in adolescents with self-injurious behavior. Future research can use this tool for diagnostic and therapeutic purposes in adolescents with self-injurious behavior.
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