Objectives:
In the literature, there is no research that would indicate how a change in specific personality elements may affect the therapeutic effect of short-term group psychodynamic psychotherapy (STGP). The aim of the study was to evaluate the effect of short-term group psychodynamic psychotherapy on personality traits in apopulation of patients with neurotic and personality disorders in a day ward of neurosis treatment.

Methods:
The study involved 139 people with anxiety and personality disorders, including 110 who participated in the control measurements. The dimensions of personality (neuroticism, extraversion, psychoticism, lie) were assessed on the basis of the Eysenck Personality Questionnaire (EPQ) adapted to the Polish conditions. The measurements were made at two time points: (1) before treatment, (2) after 12 weeks of treatment.

Results:
During therapy the level of neuroticism, extraversion, psychoticism and lie did not change significantly in the group of neurotic patients. In the group of people with personality disorders, the level of neuroticism significantly decreased (p = 0.0008), whereas the level of extraversion increased (p = 0.037). The values for psychoticism and lie did not change significantly in the course of psychotherapy in any group of patients.

Conclusions:
The dynamics of changes in neuroticism and extraversion under the influence of short-term group psychodynamic psychotherapy (STGP) in a day ward of neurosis treatment seems to be an important marker for assessing the effectiveness of the treatment in people suffering from personality disorders. There is a need to develop more precise parameters for the assessment of recovery in the group of people with anxiety disorders.