Abstract
Background: Personality is considered as an important aspect that can affect symptoms and social function in persons with schizophrenia. The personality questionnaire Swedish universities Scales of Personality (SSP) has not previously been used in psychotic disorder.Aims: To investigate if SSP has a similar internal consistency and factor structure in a psychosis population as among healthy controls and if patients with psychotic disorders differ from non-psychotic individuals in their responses to the SSP.Methods: Patients with psychotic disorders (n = 107) and healthy controls (n = 119) completed SSP. SSP scores were analyzed for internal consistency and case-control differences by Cronbach’s alfa and multiple analysis of covariance, respectively.Results: Internal consistencies among patients were overall similar to that of controls. The patients scored significantly higher in seven (Somatic trait anxiety, Psychic trait anxiety, Stress susceptibility, Lack of assertiveness, Detachment, Embitterment, Mistrust) and lower in three (Physical trait aggression, Verbal trait aggression, Adventure seeking) of the 13 scales of the inventory. In three scales (Impulsiveness, Social desirability and Trait irritability) there was no significant difference between the scoring of patients and healthy controls.Conclusion: The reliability estimates suggest that SSP can be used by patients with psychotic disorders in stable remission. Patients score higher on neuroticism-related scales and lower on aggression-related scales than controls, which is in accordance with earlier studies where other personality inventories were used.
Highlights
Personality is considered as an important aspect that can affect symptoms and social function in persons with schizophrenia
Scales of Personality (SSP) is composed of 13 different scales, i.e. Somatic trait anxiety (STA), Psychic trait anxiety (PsTA), Stress susceptibility (SS), Lack of assertiveness (LA), Detachment (D), Embitterment (E), Mistrust (M), Physical trait aggression (PhTA), Verbal trait aggression (VTA), Adventure seeking (AS), Impulsiveness (I), Social desirability (SD), and Trait irritability (TI) [11]
We aimed to investigate if SSP is possible to use in a psychosis population and if patients with psychotic disorders differ in their responses to the SSP form from people without psychosis disorder
Summary
Personality is considered as an important aspect that can affect symptoms and social function in persons with schizophrenia. The patients scored significantly higher in seven (Somatic trait anxiety, Psychic trait anxiety, Stress susceptibility, Lack of assertiveness, Detachment, Embitterment, Mistrust) and lower in three (Physical trait aggression, Verbal trait aggression, Adventure seeking) of the 13 scales of the inventory. In three scales (Impulsiveness, Social desirability and Trait irritability) there was no significant difference between the scoring of patients and healthy controls. The most consistent finding of these studies is a higher degree of Harm avoidance in the TPQ and TCI and Neuroticism in NEO questionnaires among patients with schizophrenia. SSP is composed of 13 different scales, i.e. Somatic trait anxiety (STA), Psychic trait anxiety (PsTA), Stress susceptibility (SS), Lack of assertiveness (LA), Detachment (D), Embitterment (E), Mistrust (M), Physical trait aggression (PhTA), Verbal trait aggression (VTA), Adventure seeking (AS), Impulsiveness (I), Social desirability (SD), and Trait irritability (TI) [11]. Subjects scoring high in these scales are characterized by autonomic disturbances, restlessness and tense (STA), worrying, anticipating, and lack of self-confidence (PsTA), being fatigued and feeling uneasy when urged to speed up (SS), lack of ability to speak up and to be self-assertive in social situations (LA), avoiding involvement in others, being withdrawn and schizoid (D), un-satisfaction, blaming and envying others (E), suspiciousness and distrusting people’s motives (M), getting
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