Related Experiment Video
Updated: Jun 4, 2026

Chronic Social Defeat Stress in Early Adolescent Male Mice
Published on: January 24, 2025
Bullying at school and later criminality: findings from three Swedish community samples of males
1Uni Health, University of Bergen. Olweus@psyhp.uib.no
Aim:
To examine whether being a bully at school predicts later criminality.
Method:
Longitudinal, prospective associations are reported between bullying and later criminality over the 8-year period from age 16 to 24.
Results:
Bullying in early adolescence strongly predicted later criminality. The former school bullies were heavily overrepresented in the crime registers. Some 55% of them had been convicted of one or more crimes and as much as 36% had been convicted of at least three crimes in the studied period. Effect sizes in the form of Odds Ratios were substantial for both general crimes and violent crimes, varying between 3.47 and 7.79.
Related Concept Videos
Bullying
Conduct Disorder
Causes of Social Behavior III: Biological and Environmental Influences
Aggression
Influence of Parents and Peers on Identity
Parental Influence on Identity Development
Parents serve as primary guides and managers in an adolescent's life, offering support instrumental in decision-making and personal growth. This guiding role...
Secondary Motives: Affiliation Motivation and Aggression Motivation

