Effectiveness and micro-costing of the KiVa school-based bullying prevention programme in Wales: study protocol for a pragmatic definitive parallel group cluster randomised controlled trial.

BMC Public Health · 2016 · PMC4736131 · PMID 26832736

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highly significantno p-value reported

This categorisation is conceptual (bullying concerns repeated acts), but it is supported by empirical research showing that there are large and highly significant differences between these groups on internalising problems (for victims) and externalising problems (for bullies) [ 47 ].

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