RESUMEN
The Life Style Index (LSI) was designed to assess defense mechanisms, assuming that their use is related to specific emotional states and diagnostic concepts. Aiming to further investigate the psychometric properties of the Greek version of the LSI, the aim of the present study was to investigate the relationship of specific defense mechanisms with dimensions of psychological distress and hostility features in three different populations. The sample comprised 1261 adults (410 healthy participants, 723 medical patients and 128 psychiatric patients). Along with defense mechanisms (LSI), Psychological Distress (General Health Questionnaire, GHQ-28) and Hostility features (Hostility and Direction of Hostility Questionnaire, HDHQ) were also assessed. The results showed that increased psychological distress is related with increased use of all defenses except Denial, with which psychological distress is negatively associated. Regression is constantly related with psychological distress and differentiates psychiatric patients from the other groups of participants, while Compensation and Reaction Formation are related to depressive symptomatology. In medical patients, Repression was found to increase the physical dimension of psychological distress and the social dysfunction. On the contrary,Denial was negatively associated with these dimensions of psychological distress. In the psychiatric patient and healthy participant samples, Projection plays the most detrimental role. Regarding hostility and direction of hostility, those who were found to introvert their hostility presented with higher scores in Denial, indicating that they possibly 'deny' their hostility, and the degree of the Denial was found to be negatively associated with the degree of Introverted Hostility. Those who directed their hostility towards the others, presented with higher rates of Projection, while neither Denial nor Reaction Formation seemed sufficient enough to temper the degree of Extroverted Hostility. In conclusion,the present results strengthen further the validity of the Greek version of the LSI and provide additional evidence about the relation of defence mechanisms with dimensions of psychological distress and the direction of hostility in different populations, indicating that the empirical assessment of defense mechanisms can contribute significantly in the study of the factors that mediate or moderate the course or the outcome of medical or psychiatric disorders.