Previous research has suggested that adolescents involved in bullying are more likely to carry weapons than peers who are not involved in bullying.
Mitch van Geel of Leiden University, the Netherlands, and colleagues reviewed medical literature and analysed 22 studies for victims, 15 studies for bullies and eight studies for bully-victims.
The studies indicated that bullies, victims and bully-victims were more likely to carry weapons.
Studies conducted in the US found stronger associations between being a bully-victim and weapon-carrying than studies in other countries.
"Given the wide range of negative implications bullying may have, it is important that schools endeavour to reduce bullying among their students, preferably by using evidence-based methods," they said.