ORIGINAL RESEARCH article
Front. Psychiatry
Sec. Schizophrenia
Adaptation of "Osnabrück Scale for Therapy Adjustment and Identification of Psychological Complaints in Schizophrenia-OSSTI-TR" into Turkish Culture and Investigation of Its Psychometric Characteristics
Provisionally accepted
- 1Üsküdar University, Üsküdar, Türkiye
- 2Saglik Bilimleri Universitesi, Istanbul, Türkiye
- 3Artvin Coruh Universitesi, Artvin, Türkiye
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ABSTRACT Aim: This study aims to adapt the "Osnabrück Scale for Therapy Adjustment and Identification of Psychological Complaints in Schizophrenia" (OSSTI) into Turkish and evaluate its psychometric properties. The study addresses the need for a practical self-report tool to simultaneously assess metacognitive awareness and treatment adherence in Turkish patients with schizophrenia. Methods: Data were collected from 335 patients diagnosed with schizophrenia. Following translation and back-translation, content validity was confirmed via expert panel. Construct validity was tested using Exploratory Factor Analysis (EFA) and Confirmatory Factor Analysis (CFA). Reliability was assessed through Cronbach's alpha and split-half coefficients. Results: EFA identified a three-factor structure—Awareness, Denial, and Adjustment— explaining 58.03% of the total variance. While initial single-factor CFA was rejected, the final model demonstrated acceptable alignment with the theoretical framework. The scale's overall internal consistency was Cronbach's α = .73, with subscale coefficients ranging from .70 to .78. Convergent validity was supported by a significant moderate correlation with the Morisky Medication Adherence Scale (r = -.418, p < .001). Conclusion: The OSSTI-TR is a valid and reliable instrument for assessing therapy adjustment in schizophrenia. Its strong psychometric indices and metacognitive focus provide a robust framework for clinical evaluation and research in the Turkish context.
Keywords: Insight, Reliability, Schizophrenia, Therapy adjustment, validity
Received: 03 Aug 2025; Accepted: 22 Jan 2026.
Copyright: © 2026 Babaoğlu, Akkurt Yalçıntürk and Kanbay. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence: Elçin Babaoğlu
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