Validity and Reliability Study of the Moodist Outcome Inventory (MOI).

Background: The objective of this study is to develop an easily applicable scale to measure the course of treatment and the level of recovery for mental problems in various dimensions, which can be used in clinical practice and research. Methods: The validity and reliability test of Moodist Outcome Inventory (MOI) were conducted with 293 participants. Criterion-related validity was investigated by assessment with the Brief Psychiatric Rating Scale (BPRS), Disability Assessment Schedule (WHO-DAS-II), and Psychological Distress Scale (K10-PDS). Factor analysis was investigated by assessment with clinical and non-clinical samples. The sample was followed for six clinical assessments and evaluated by repetitive analysis of Variance (ANOVA) measurement. Results: The Cronbach's alpha coefficient of the total scale was noted to be 0.89 in the reliability analysis. In the exploratory factor analysis, the single factor explaining 75.64% of the total variance was attained, and all items were included in this factor. Forty cases completed six clinical assessments, and the change between the MOI scores during the time interval was noted to be statistically significant. The correlation of the MOI scale with the K-10, WHO-DAS-II, and BPRS scales was noted to be 0.62, 0.73, and 0.65, respectively. In six consecutive assessments, the mean scores of all scales dropped significantly. The cut-off point of the scale was recorded as 7.27, and the reliable change index (RCI) was noted as 2.5. Conclusion: MOI was assessed as a valid and reliable scale for evaluating the course of treatment. The strengths of the scale are that it assesses both symptoms and well-being, is short, and can be implemented in clinical practice.