Emotional reactivity mediates and moderates the longitudinal associations between mothers' depressive symptoms and behavioral problems in youth.

Despite the well-established link between mothers' depressive symptoms and youth behavioral problems, it remains unclear whether the mechanism by which mothers' depressive symptoms promote behavioral problems may also be related to individual differences in this relation. Following the three-variable system integrating mediation and moderation, this study used an integrative model to simultaneously examine the mediating and moderating role of emotional reactivity in the longitudinal associations between maternal depressive symptoms and internalizing and externalizing problems in youth. Participants were 1060 youth and their mothers from the NICHD Study of Early Child Care and Youth Development (49.7% boys, 81.6% white). Mothers reported their own depressive symptoms at nine waves from infancy through the fifth grade. They also rated adolescents' emotional reactivity in the fifth grade and behavioral problems in the fifth and sixth grades. The results showed that emotional reactivity mediated the longitudinal relations between maternal depressive symptoms and internalizing and externalizing problems in youth. The results also supported the moderation of emotional reactivity. That is, mothers' depressive symptoms were associated with high levels of internalizing and externalizing problems, particularly among youth who were high in emotional reactivity. The findings highlight the dual role of emotional reactivity to better understand the associations between mothers' depressive symptoms and offspring behavioral problems, and emphasize the need to target emotional reactivity to alleviate the adverse impacts of maternal depressive symptoms on behavioral adjustment in early adolescence.