The association between number of siblings and delinquent behaviour

This study examines the association between number of siblings and delinquency, adjusting for family relations and demographic variables. Data is based on a nationally representative school survey in Sweden consisting of approximately 25,000 youths. The results show a positive association for those having five or more siblings (IRR = 1.533, p = < .001), whereas one or two siblings is negatively associated with delinquency compared to those having no siblings. These results remain stable after adjusting for family relations. This study underscores the importance of further exploring the variation and direction of the association between the number of siblings and delinquency, as well as deepening our understanding of the various theoretical mechanisms through which the number of siblings is associated with delinquent behaviour.