Evaluation of Temperament and Character Traits and Their Subscale Dimensions Associated with Major Depressive Disorder.

Objectives: The relationship between major depressive disorder (MDD) and, especially harm avoidance, self-directedness, and cooperativeness has been determined based on Cloninger's psychobiological personality model; there are not enough studies in the literature on the role of the subdimensions. Therefore, the aim of this study was to compare the patients with MDD and healthy controls in terms of temperament and character traits and especially subdimensions and thus to determine the role and predictive value of temperament and character subdimensions in major depression patients.

Methods: The sample of this cross-sectional study consisted of 105 participants, 65 of whom were MDD patients, and 40 healthy controls, who voluntarily agreed to participate in the study. Sociodemographic data form, temperament and character inventory, and Hamilton depression rating scale were administered to the participants.

Results: Compared with healthy controls, patients with MDD had lower self-directedness (p<0.001), cooperativeness (p=0.017), persistence (p<0.001), self-transcendence (p=0.001), and higher harm avoidance (p<0.001) scores. While there was no significant difference in novelty seeking (p=0.774); it was determined that MDD patients got higher scores in "Impulsiveness" (p=0.013) and lower scores in "Exploratory excitability" (p=0.001) subscales. Reward dependence has been identified as the only personality trait that there was no significant difference between major depression patients and healthy controls (p=0.511). As a result of the logistic regression analysis performed to determine the predictors of temperament and character subdimensions in major depression patients, only three temperament and character traits "Fatigability, Purposefulness, and Spiritual Acceptance" were determined as significant predictors (p<0.001). Fatigability was determined to be a serious risk factor, increasing the probability of MDD 3.6 times (p<0.001); purposefulness and spiritual acceptance were found to be protective personality traits that together reduced the probability of MDD by 0.8 times (p<0.001).

Conclusion: This study shows that the risk of developing MDD is increased in individuals with low self-directedness, cooperativeness, persistence, and self-transcendence profiles, and whereas with prominent Harm avoidance personality traits. Therapeutic interventions, especially considering the temperament and character traits of "Fatigability, Purposefulness, and Spiritual Acceptance" determined in our study, may contribute positively to MDD treatment.