Preliminary Evaluation of a Six-Day Outpatient Psychotherapeutic Training (DIAT) for Anxiety, Depression, and Stress in Adults: A Three-Month Follow-Up

<b>Background:</b> This study presents a preliminary evaluation of a six-day outpatient psychotherapeutic training based on the Duc in Altum Therapy (DIAT) approach, examining its effectiveness in reducing symptoms of anxiety, depression, and stress among adults. Given the growing demand for brief, effective mental health interventions, this format aims to provide intensive support within a condensed timeframe. <b>Methods</b>: The intervention consisted of supportive and experiential group therapy delivered over six days and included 109 participants. Outcomes were assessed at three time points-pre-intervention, post-intervention, and three-month follow-up-using the Direct Behavior Rating Scale Items, the Brief Screen for Depression (BSD), and the Perceived Stress Scale (PSS-10). <b>Results</b>: Participants reported lower levels of anxiety (B = -1.435, <i>p</i> < 0.0001), depression (B = -0.717, <i>p</i> < 0.001), and stress (B = -1.882, <i>p</i> < 0.001) after training, reflecting statistically significant within-group changes. These improvements were maintained at the three-month follow-up. <b>Conclusions</b>: Although the absence of a control group limits causal inference, the findings provide preliminary support for the effectiveness of DIAT as a brief psychotherapeutic intervention. Participants reported lower levels of anxiety, depression, and stress after the training, reflecting statistically significant within-group changes. These improvements were maintained at the three-month follow-up.