It is crucial to develop robust methods to evaluate the efficacy of music therapy in everyday practice. This presentation aims to showcase a study employing the Jacobson-Truax Method (JT Method) to calculate the Reliable Change Index (RCI) and analyze clinical significance in pre- and post-intervention assessments. Data were collected from clinical practices linked to the Music Therapy in Mental Health project (SIEX/UFMG – 402786) involving a substance use disorder treatment center and a therapeutic residence. This study highlights the potential of the JT Method to detect reliable individual changes, even when null hypothesis tests indicate no statistically significant group changes. By presenting these findings, we aim to support the broader application of music therapy assessments in clinical practice and an intraindividual analysis of the effectiveness of music.
