Journal article

The Effectiveness of the KiVa Bullying Prevention Program in Wales, UK: Results from a Pragmatic Cluster Randomized Controlled Trial

Nick Axford, Gretchen Bjornstad, Suzy Clarkson, Obioha C Ukoumunne, Zoe Wrigley, Justin Matthews, Vashti Berry, Judy Hutchings



The study evaluated the implementation fidelity and effectiveness of KiVa, an evidence-based program that aims to prevent and address bullying in schools, with a particular emphasis on changing the role of bystanders. The study was a two-arm waitlist control cluster randomized controlled trial in which 22 primary schools (clusters) (N = 3214 students aged 7-11) were allocated using a 1:1 ratio to intervention (KiVa; 11 clusters, n = 1588 students) and a waitlist control (usual school provision; 11 clusters, n = 1892 children)). The trial statistician (but not schools or researchers) remained blind to allocation status. The outcomes were as follows: student-reported victimization (primary out..

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Awarded by Big Lottery Wales

Funding Acknowledgements

Big Lottery Wales (Award Number B/1/1/010430196) funded the costs of the trial, including recruitment conferences, provision of program resources for schools, translation of resources into Welsh, support and feedback sessions, and central organizational meetings. The design, management, statistical analysis, and dissemination of the trial were fully independent of the Big Lottery and KiVa Finland. The program was delivered by teachers and other school staff during school hours and no supply costs were provided to schools for staff training.