Objective: This study examined the growth pattern in physical aggression over a five-year period among South Korean early adolescents and the effects of temperament (anger/frustration and emotion regulation) and parenting (harsh parenting and parental monitoring) on early adolescents' physical aggression. Design: A five-year longitudinal…

Objective: Previous studies have shown that academic achievement has a significant effect on juvenile delinquency, with the reverse reported as well. This study, therefore, examined the reciprocal causal relationships between academic achievement and juvenile delinquency. Methods: The participants were 3449 Korean adolescents (mean age 13.2 years,…

Objective: Substance use, such as alcohol and tobacco, is becoming a critical problem in the area of health promotion and preventive programme. Furthermore, the onset of alcohol use has been becoming increasingly earlier. This study examined developmental trajectories of substance use among high school students in South Korea and effects of peer…