目標：霸凌事件是值得研究的公共衛生議題。本文目的乃描述台灣地區公立國中學生之霸凌角色的分佈，並探討與其相關之個人及家庭因素。方法：為獲得台灣地區具代表性之公立國中生樣本，因此先自台灣北、中、南、東各區，以系統抽樣的方式抽出五間學校，每校每年級選兩班作為研究樣本。最後共20間學校，120個班級參加調查，於2010年9至12月完訪3,441人。為考量設計效果，以抽取率的倒數作為權值，並以SAS 9.1.3之Proc Survey模組進行描述統計及多項式邏輯斯迴歸分析。結果：台灣地區國中生有8.71%為霸凌者、7.01%為被霸凌者，2.91%為雙重身份者，共18.63%為霸凌事件的涉入者。性別、衝動人格、自覺受歡迎程度、父母最高教育程度、家庭衝突頻率、口語責罵頻率及體罰頻率分別與霸凌角色有不同的關連性。結論：霸凌事件在國中盛行，建議在國中之前即可發展預防介入計畫。不同霸凌角色之相關因素不同，應針對不同角色設計介入方案。整體而言，建議家庭增加良性互動和減少衝突及過度責罰。

Objectives: Bullying is an important public health issue. The aims of this study were to demonstrate the prevalence of bullying roles and to investigate individual and family correlates of these roles among 7th to 9th graders in Taiwan. Methods: Participants included 3,441 students from 120 classes in 20 schools via stratified, multistage, random cluster sampling. To estimate the prevalence of roles in bullying, the weighting index was calculated from the inverse of the sampling rates. Descriptive analysis and multinomial logistic regression were performed using SAS Survey Analysis PROCs software. Results: Our survey revealed that 18.63% of the students were involved in bullying with 8.71% as bullies, 7.01% as victims, and 2.91% in both roles. Gender, level of impulsiveness, self-perceived popularity, parental educational attainment, the frequency of family conflict, scolding, and corporal punishment were significantly related to the probability of being classified in one bullying role or another. Conclusions: School bullying is not uncommon in Taiwan. Our results suggested that individual characteristics and family factors associated with bullying roles should be taken into account in the development of programs to prevent bullying.