The purpose of this study was to investigate the clinical meaning and various probable external environmental factors associated with homicidal behavior committed by schizophrenic patients. The study subjects were 148 homicidal schizophrenics, who were admitted to the Forensic Psychiatric Institution from November, 1987 to August, 1988. From the analysis of the medical records and additional data of the patients, following results were obtained. 1) The m ale: female sex ratio of the patients were 3.8: 1, and 79.7% of the patients were in the age group of 20 to 39. The mean ± SD age was 29.9土 9.0 years old in male and 32.9±7.4 years old in female. 2) As to the residence, 54.1% of patients lived in rural area. As to the site of their homicidal acts, 58.8% of patients committed the act in their houses; 13.5%, on street near their ho use; 11.5%, in other person’ s house and so on. 3) As to the time of homicidal acts, the frequency of homicides peaked from 0 * 00 AM to 2 * 00 AM and from 2 : 00 PM to 4 : 00 PM. It occurred most on Monday, least on Sunday. Homicides by patients varied also according to the m o n th ; they were most common in August and September. In terms of season, it was less frequent in winter. 4) In terms of the lunar cycles, no significant differences was found between each phases, but there was tendency for homicidal acts to increase just after the full moon formation. 5) As to the weather factors, 37.2% of homicides were committed in the temperature range of 10°C to 20°C. Above 30°C and below 0°C, there was sharp decrease of homicidal acts. Relative humidity was not significantly different from that of reference level of Seoul(l9 87). Cloudiness was sidgnificantly different from that of reference level, and 52.0% of patients acted out on cloudy day(p<0.001, X2= 44.37).
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