Additive and Moderating Effect of Parents and Friends on Health and Behavior Outcomes During Emerging Adulthood

Relationships with parents and friends may work together to increase the risk of adjustment problems in emerging adulthood. However, it is still undetermined if social relationships act in an additive (i.e., serve as unique predictors) or moderating (i.e., interact with other predictors) fashion. In a cross-sectional sample of 859 female college students ( M _age = 19.53, SD = 1.49; 73.9% White) from a large university in the south-central United States, we assessed how parents and best friends impact emerging adult internalizing symptoms, risky behavior, and health problems. We found that low levels of best friend risky behavior attenuated the links between father-emerging adult relationship quality and risky behavior and internalizing symptoms, and high levels of father-emerging adult relationship quality magnified the association between mother-emerging adult relations and internalizing symptoms. Ultimately, these results indicate that relationships with parents and friends served as additive or unique predictors of emerging adult health and behavior.