Adolescents' Internet use is increasingly mobile, private, and unsupervised, which raises concerns given that the Internet increasingly serves as a medium for experiencing victimization. Although it is widely recognized that in-person victimization has a deleterious effect on adolescents' educational outcomes, the extent to which…

The main aim of this article is to investigate whether there is a significant long-term association between bullying at school and drug use later in life. A meta-analysis is presented based on results from major prospective longitudinal studies with available unadjusted and adjusted effect sizes. Results are based on thorough systematic searches…

Background: Bullying research has gained a substantial amount of interest in recent years because of the implications for child and adolescent development. Aim and sample: We conducted a meta-analysis of traditional and cyberbullying studies in the Republic and North of Ireland to gain an understanding of prevalence rates and associated issues…

This meta-analysis synthesized results about the association between empathy and defending in bullying. A total of 20 studies were included, with 22 effect sizes from 6 studies that separated findings by the defender's gender, and 31 effect sizes from 18 studies that provided effects for the total sample were included in the analysis. The weighted…

School bullying and delinquent behaviors are persistent and pervasive problems for schools, and have lasting effects for all individuals involved (Copeland et al., "JAMA Psychiatry" 70:419-426, 2013; Espelage et al., "J Res Adolesc" 24(2):337-349, 2013a). As a result, policymakers and practitioners have attempted to thwart…

This paper presents a meta-analytic review of 33 studies, with a total of 29,552 participants, that examined the concurrent association between peer victimization and academic achievement. The results revealed a small but significant negative correlation between peer victimization and academic achievement under both the random-effects model (r =…

This chapter presents the results from two systematic/meta-analytic reviews of longitudinal studies on the association of school bullying (perpetration and victimization) with adverse health and criminal outcomes later in life. Significant associations between the two predictors and the outcomes are found even after controlling for other major…

Objective: A recent meta-analytic review of cross-sectional studies examining correlations between peer victimization and indices of internalizing problems indicates that victims of bullying are highly distressed. However, the reliance on cross-sectional studies precludes interpretation of the direction of effects. The present study was designed…

Objective: The effects of school-based antibullying programs have typically been examined on small samples, with number of schools ranging from 1 to 78 (Farrington & Ttofi, 2009). This study investigated the effectiveness of the KiVa antibullying program in the beginning of its nationwide implementation in Finland. Method: At each time point,…