Residential Treatment for Children & Youth, 31:80-88, 2014 Copyright Co Taylor & Francis Group, LLC ISSN: 0886-571X print/1541-0358 online DOI: 10.1080/0886571X.2014.880275 Routledge Taylor &Francis Group Understanding Bad Girls: The Role of Trauma in Antisocial Behavior Among Female Youth IRENA PODGURSKI, BA and JOHN S. LYONS, PhD School of Psychology, University of Ottawa, Ottawa, Ontario, Canada CASSANDRA KISIEL, PhD and GENE GRIFFIN, JD, PhD Department of Psychiatry, Northwestern Unitmity Feinberg School of Medicine, Chicago, Illinois, USA There is a substantial body of research on delinquent behavior and symptoms of conduct disorder among young males; however, less attention has been dedicated to understanding the female popu- lation. The aim of this study is to examine young girls' severity of needs related to conduct disorder and delinquent behavior in rela- tion to various past traumatic experiences. We hypothesized that for girls the presence of these needs will be correlated with phys- ical and sexual abuse. Furthermore, we propose the relationship of trauma to conduct-related needs will be higher among females as compared to males. Data were collected on 1,479 girls ages 12-18 who entered into state child welfare custody. Each partic- ipant has been assessed using the Child and Adolescent Needs and Strengths (CANS), which helps identify mental health needs and strengths of every youth. Results show partial support for the hypoth- esis that sexual abuse has a significant correlation with conduct disorder symptoms; however, physical abuse showed no significant correlation with severe conduct disorder symptoms. Surprisingly, school and community violence had the highest correlation with conduct disorder symptoms. The results clearly establish a relation- ship between lifetime trauma experiences and the presentation of symptoms of conduct disorder among adolescent females. These results were not replicated among comparison sample of adolescent males. Address correspondence to John S. Lyons, PhD, School of Psychology, University of Ottawa, Vanier Hall, 4085, Ottawa, ON, Canada K1N 6N5v. E-mail: John.Lyons@uottawa.ca 80