| Summary: | 碩士 === 中國醫藥大學 === 環境醫學研究所 === 93 === This study examined the relative impact of the social, psychological and biological factors on the occurrence of violent behaviors, especially physical violence for male adolescents. The subjects consisted of 94 juvenile delinquents recruited from Taichung District Court and 205 school students recruited from two high schools at the north of Taichung city.
A self-reported survey questionnaire was used to collect data on the occurrence of physical violence and its correlates. The data of social and psychological correlates were on family backgrounds, family protection, parental monitoring, teachers’ caring, learning achievement, peer delinquency, substance use, mental health, and personality traits. The data of biological correlate was on the experience of head injury. Blood samples were collected for other biological data on the levels of serotonine, testosterone, lead, cadmium and manganese. Multiple logistic regression analysis was conducted to examine the relative impact of bio-psycho-social factors for each group.
The results were as follows: 1) For school adolescents, drinking experience, the symptoms of oppositional defiant disorder, and the experience of head injury were significantly associated with the occurrence of physical violence; and the odds ratios were 1.86 (95% C.I.=1.00~3.43), 1.10 (95% C.I.=1.02~1.17) and 2.83 (95% C.I.=1.31~6.14), respectively. 2) For court delinquents, the symptoms of oppositional defiant disorder and the level of manganese were significantly associated with the outcome, and the odds ratios were 1.13 (95% C.I.=1.01~1.19) and 0.44 (95% of C.I.=0.20~0.98), respectively. In this study, for both groups of teens, the effects of biological factors remained significant while controlling the effects of social and psychological factors. This suggested that one should not neglect the relative importance of biological factors when one wants to explore the etiology of physical violence.
Key words: violence behavior, head injury
oppositional defiant disorder, manganese
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