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Objective. To examine adverse childhood experiences (ACEs) as a prospective predictor of the day-to-day associations between worries and positive thinking among late adolescents. Method. Cumulative ACEs were measured from parent and youth reports between the ages of 9.9 and 18.1. Late adolescents (N = 103) reported daily worries and positive thoughts across ten days. Results. Adverse childhood experiences predicted higher and more variable levels of day-to-day worry. Increases in positive thinking on one day predicted less next-day worry for adolescents with low, but not high, ACE scores. Conclusions. Daily worry during late adolescence may be an important consequence of earlier exposure to ACEs. Early interventions focused on worry reduction and improved emotion regulation might mitigate worry among high-ACE youth. 

Abstract This study investigates bidirectional associations between adolescents’ daily experiences of victimization and aggression perpetration within friendships. We investigated (a) across‐day associations between victimization and aggression perpetration; (b) morning cortisol activity as a moderator of cross‐day victimization and aggression links; and (c) potential sex differences in these patterns. For 4 consecutive days, 99 adolescents (M_age = 18.06,SD = 1.09, 46 females) reported whether they were victimized by or aggressive toward their friends. On three of these days, adolescents provided three morning saliva samples. Multilevel path analyses showed that across days, victimization and aggression were bidirectionally linked, but only for male adolescents. Additionally, for male adolescents, morning cortisol output (but not morning cortisol increase) moderated the association between victimization and next‐day aggression; victimization predicted greater next‐day aggression for boys with low, but not high, morning cortisol output. Findings implicate a physiological factor that may modify daily links between victimization and aggression in male adolescent friendships.