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The current study used meta-regression to establish trends in bullying from 1998 to 2017, to identify factors that help explain variation in bullying trends, and to determine differences in the trends by gender and grade. This study focused on trends of face-to-face (FTF) bullying victimization and perpetration, cyberbullying victimization, relational bullying victimization, verbal bullying victimization, and physical bullying victimization, as well as characteristics of the youth involved. It also explored methodological and survey differences to help determine which factors contribute to variation from study to study. A systematic search found 91 studies reporting trends of bullying, from 1998 to 2017, that met predefined inclusion and exclusion criteria. The findings illustrate no significant time trend when looking at FTF bullying victimization, yet an increasing time trend for cyberbullying victimization. Additional trends begin to emerge when stratifying the findings by grade and gender, with FTF bullying victimization among boys declining, while FTF bullying victimization among girls is increasing. Across both FTF bullying victimization and cyberbullying victimization, younger adolescents report significantly more bullying than older adolescents, and this is consistent over time. Verbal and physical bullying victimization as well as FTF bullying perpetration have significantly declined over time. This study also identified key variables that contribute to the variation from trend study to trend study. The implications of these findings inform both policy and practice and provide insight into the overall scope of bullying within the United States.

Bully-victims are often found to be the most high-risk group involved in bullying, yet limited prior research has explored differences among bully-victims. This study aims to fill that gap by exploring within-group differences of youth involved in both bullying perpetration and victimization. In a nationally representative sample of 165 youth ages 5 to 17, four bully-victim types were created using cutoff points based on the amount of perpetration and victimization reported: high bully-victims ( n = 38), aggression predominant bully-victims ( n = 67), victimization predominant bully-victims ( n = 23), and moderate bully-victims ( n = 37). Analyses revealed distinct differences among the groups, particularly relating to traumatic symptoms, types of bullying involvement, and nonvictimization adversity. The findings confirm that there is heterogeneity among bully-victims. The most substantial difference was found between the high group and the moderate group, with the high group significantly more likely to report depression ( p < .05) and anxiety symptoms ( p < .05), and more than two times more likely to experience past-year adversity than the moderate group. The findings from this study indicate that youth involved in high amounts of both perpetration and victimization are considerably more at risk of traumatic symptoms and nonvictimization adversity than youth involved in fewer bullying behaviors. These findings can be used to inform both research and practice, particularly in regard to targeted evidence-based interventions that meet the unique needs of each type.

Despite sufficient evidence to conclude that maltreatment exposure affects the risk of crime and delinquency, we conclude that the magnitude and specificity of effects of child maltreatment on crime and delinquency and the mechanisms through which those effects operate remain poorly identified. Key challenges include insufficient attention to the overlap of child maltreatment with various forms of family dysfunction and adversity and a lack of comprehensive measurement of the multiple, often comorbid, forms of child maltreatment. We then consider the potential impacts of the child welfare system on the maltreatment–crime link. Because the child welfare system typically provides voluntary, short-term services of unknown quality, it likely neither increases nor reduces risks of delinquency and crime for most children who are referred or investigated. For the comparatively small (although nominally large and important) subset of children experiencing foster care, impacts on delinquency and crime likely vary by the quality of environments within and after their time in care—issues that, to date, have received too little attention. Expected final online publication date for the Annual Review of Criminology, Volume 5 is January 2022. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

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