Aggressiveness is one of the most stigmatization symptoms of paranoid schizophrenia with its possible roots in personality and/or acute psychopathology of schizophrenia.

To explore general and personality differences among suicidal, homicidal and non-aggressive male subjects with paranoid schizophrenia.

We recruited all consecutive inpatients fulfilling the ICD-10 criteria of paranoid schizophrenia during 2009-2011. Personality traits were determined by the NEO Five-Factor Inventory (NEO-FFI) scale which measures the five major personality traits: emotional stability, extraversion, openness to experience, agreeableness and conscientiousness).

The study included 359 male subjects diagnosed with paranoid schizophrenia. Their mean age was 37,8 yrs (SD 11,9) and duration of illness 13,77 yrs (SD 12,1). Majority were single (N=271, 75,5%), with 8-12 yrs of education (N=266, 75%) and unemployed (N=193, 53,8%). In an attempt to assess their auto and heteroagressivness, subjects were divided into three groups: subjects with suicide ideation (N=66, 18.4%), subjects with suicide attempt (N=67, 18,7%) and subjects with homicidal behavior (N= 86, 24%). These groups were compared against the comparative group of subjects without suicidal ideation, suicide or homicide behavior (N=140, 39%). Subjects with homicide behavior were significantly older, with longer duration of illness, majority were diagnosed with comorbid alcohol addiction and these participants scored higher on the emotional stability subscale (ANOVA F=7.8, df= 3, P=0.001).

These findings might contribute to discussion of the role of personality characteristics in paranoid schizophrenia.