Criminal Justice and Behavior, Ahead of Print.
This study examines whether one’s own delinquency and peer delinquency are reciprocally related and how prior delinquency and bonding variables influence peer delinquency trajectories. Using data from a 6-year follow-up study of 2,351 Korean adolescents, the study incorporates a group-based model to identify subgroups, each having a unique pattern of peer delinquency trajectories. The models yielded three subgroups: the early-onset and declining, the late-onset, and the nonoffending groups. The results reveal that compared with the nonoffending group, prior delinquency was significant for both the early-onset and decreasing and late-onset groups. Membership in the early-onset and decreasing group was associated with a greater likelihood of prior delinquency compared with the late-onset group. Commitment to school rule differentiated the early-onset and decreasing group from the nonoffending group, and partially mediated the effect of prior delinquency. The late-onset group members reported the highest probability of later delinquent behavior among the three groups.