Study design This randomized controlled trial was conducted at the Mental Health Center of Peristeri, department of the Psychiatric Hospital of Attica, Greece, from December 2018 to January 2020. The study protocol was approved by the School of Medicine, National and Kapodistrian University of Athens (Protocol n. 1718038002/30/07/2018) and the center's directorate and was consistent with the Declaration of Helsinki. All participants were enlisted in the study only after being fully informed by the researcher about the aims and procedures of the research and submitting written consent.~Procedures Patients eligible for the above mentioned criteria were randomized in two groups: the intervention group, receiving PSAI, and the control group, receiving the usual care provided by the center for patients with MDD, namely medical treatment and counselling. Randomization was conducted based on random numbers generated by an online random number generator (https://www.sealedenvelope.com/simple-randomiser/v1/lists). This study was non-blinded, as patients and researchers were aware of the group assignment.
The present study explored the effects of the implementation of the Pythagorean Self Awarenes Intervention (PSAI) on patients diagnosed with major depressive disorder. The primary aim was to evaluate the effectiveness of PSAI compared to the usual care provided for adults with major depressive disorder with respect to the reduction of depressive symptoms. Secondary aims of this study included reduction of stress and anxiety, enhancement of healthy lifestyle and improvement of affect, sleep quality and cognitive functions of patients.