Lee H, et al. - Given a significant impact of adverse childhood experiences (ACEs) on mental health outcomes, researchers here investigated underlying ACE classes including exposure to community violence and examined the associations of ACE classes with mental disorders in adulthood: depression, anxiety, and posttraumatic stress disorder (PTSD). Observations suggest exposure to community violence as a distinct ACE class. Latent class analysis of the data from the National Longitudinal Study of Adolescent and Adult Health (Add Health; N = 10,784) led to recognition of four heterogeneous ACE classes: (1) child maltreatment (17.47%), (2) household dysfunction (14.39%), (3) community violence (5.36%), and (4) low adversity (62.79%). Three logistic analyses showed that the child maltreatment class is at a higher likelihood of depression, anxiety, and PTSD. A significant association was observed between the community violence class and PTSD in adulthood. Findings thereby emphasize the significance of considering types of ACEs exposure for improving the mental health of young adults.