Psychology and Psychotherapy: Theory, Research and Practice Validation of the Lithuanian version of the Clinical Outcomes in Routine Evaluation Outcome Measure (CORE-OM) --Manuscript Draft-- Article Type: Research article Manuscript Number: Full Title: Validation of the Lithuanian version of the Clinical Outcomes in Routine Evaluation Outcome Measure (CORE-OM) All Authors: Rima Viliuniene, M.D. Chris Evans Jan Hilbig Vilmantė Pakalniškienė Vita Danilevičiūtė Eugenijus Laurinaitis Corresponding Author: Rima Viliuniene, M.D. Vilnius University Vilnius, LITHUANIA Corresponding Author E-Mail: rima.viliuniene@gmail.com;rima.viliuniene@mf.vu.lt Keywords: Outcome Measures; CORE-OM; Validation; Psychotherapy; Transcultural Psychology Abstract: Objectives: To determine reliability, validity and sensitivity of the Lithuanian translation of CORE-OM questionnaire. Design: A validation study of the CORE-OM was conducted in the psychiatric clinic attached to Vilnius University (VU). A Lithuanian translation of the English original of the CORE-OM was prepared by a team of translators and one of the original authors. Thirty-nine psychotherapy outpatients and 187 students were asked to complete the Lithuanian version of the CORE-OM, 66 were tested a second time after an interval of one week to determine retest stability. Methods: Analysis included both internal and test-retest reliability, acceptability, influence of gender, principal component analysis and criteria for reliable and clinically significant change. Results: Internal and test-retest reliability were good (0.61-0.94), except for somewhat lower parameters of the risk domain (α: 0.57 - 0.79, spearman's rho 0.25-0.60). Differences between scores of the clinical and non-clinical samples were large and significant (p<0.001) with lower scores in the clinical sample. Some of the Lithuanian criteria for clinically significant change were a bit lower than those of the original (e.g. well-being), others a bit higher (symptoms, functioning, overall score). Conclusions: As expected, there are some differences in psychometric properties for the Lithuanian translation with Lithuanian samples compared with the original UK data from the English version. However, the Lithuanian version of the CORE-OM was reliable and sensitive in both clinical and non-clinical settings. It seems to have the potential to become a practical, sensitive and reliable diagnostic tool for psychotherapists in Lithuania. Powered by Editorial Manager® and Preprint Manager® from Aries Systems Corporation