Treating bullying as everyone's problem reduces incidence in primary schools

> The results from the UK trial of 13% reduction in bullying are less compelling than those from earlier studies in other European countries. However, the U.K. trial took place during the COVID-19 pandemic, which involved major classroom disruption for pupils and considerably higher levels of absenteeism, and researchers believe this may have affected the results.

1) 13% just doesn't seem like a lot to me

2) I wonder what those other studies showed.

I think the bigger question, since it apparently involves reported bullying incidents rather than teacher-observed ones, is whether the change in policy results in underreporting or overreporting of bullying. Plausibly it could be a lot more than a 13% fall if kids feel much more incentivised to report it, or a negligible effect if there's a 13% chance of it not being reported because bullied kids don't want to get their bystander classmates into trouble...