Abstract
Meta-analyses on the effectiveness of antibullying interventions show that average effects tend to be significant but small. Informed by the vantage sensitivity framework, the current study aimed to test in a large randomized controlled trial whether individual differences in environmental sensitivity predict treatment response to an antibullying intervention. A total of 2,042 pupils (Grades 4 and 6) were randomly assigned to a treatment or control condition. Significant intervention effects on victimization and internalizing symptoms were moderated by both environmental sensitivity and gender: Boys who scored high on sensitivity benefited significantly more than did less sensitive boys from the effects of the intervention regarding reduced victimization and internalizing symptoms. The findings are consistent with the notion of vantage sensitivity, suggesting that some individuals are disproportionately likely to respond to treatment and others are more resistant as a function of individual differences in environmental sensitivity.