Trajectories of parental harshness and exposure to community violence differentially predict externalizing and internalizing mental health problems in legal system-involved youth.

Youth with legal system involvement are especially likely to experience parental harshness (PH) and exposure to community violence (ETV), two common forms of life stress. However, most studies examine these stressors separately or collapse across them in ways that preclude examination of their co-occurrence. Consequently, it is unclear 1) how PH and ETV simultaneously fluctuate across development and 2) how these fluctuations predict future mental health problems in legal system-involved youth. We used group-based multi-trajectory modeling to estimate simultaneous trajectories of PH and ETV in 1027 legal system-involved youth and regression analyses to understand how trajectory membership predicted mental health problems three years later. Four trajectories of co-occurrence were identified (1: ; 2: ; 3: ; 4: ). Compared to the trajectory, all trajectories with PH/ETV elevations predicted violent crime and substance problems; trajectory 3 () predicted nonviolent crime and depression/anxiety symptoms; trajectory 4 ( predicted depression diagnosis. These results elucidate PH and ETV typically co-occur across adolescence for legal system-involved youth. They also reveal important commonalities and dissociations among types of mental health problems.