From Early Stress to Adolescent Struggles: How Maternal Parenting Stress Shapes the Trajectories of Internalizing, Externalizing, and ADHD Symptoms.

Background/objectives: Parenting stress, the emotional strain resulting from the demands of child-rearing, can profoundly affect both parental well-being and children's emotional and behavioral development. This study examined the impact of maternal parenting stress during early childhood on the longitudinal progression of children's internalizing, externalizing, and attention deficit hyperactivity disorder (ADHD) symptoms, from early childhood through adolescence.

Methods: The study included 406 mother-child pairs from the Rhea mother-child cohort in Crete, Greece. Maternal parenting stress was assessed at age 4 using the Parental Stress Scale (PSS). Children's symptoms were evaluated at ages 4 (Strengths and Difficulties Questionnaire, ADHD Test), 6, 11, and 15 years (Child Behavior Checklist, Conners' Parent Rating Scale) through maternal reports. Multivariate mixed regression models, incorporating a random intercept for each child and a random slope for age at follow-up, were used to analyze the trajectories of symptoms from ages 4 to 15. Group-based trajectory modeling was applied to identify trajectory groups from 4 to 15 years, and multinomial logistic regression models were implemented to examine the associations between parental stress and group trajectories.

Results: The results revealed that higher parental stress at age 4 was significantly associated with increased internalizing (b = 0.94, 95% CI: 0.68, 1.21), externalizing (b = 1.03, 95% CI: 0.75, 1.30), and ADHD symptoms (b = 0.86, 95% CI: 0.58, 1.14) over the study period. Notably, the impact of parenting stress on behavioral problems decreased with age (interaction with age, p = 0.032). Additionally, higher parenting stress at age 4 was linked to a greater likelihood of belonging to adverse symptom trajectories, including high decreasing, low increasing, and stable high trajectories for both internalizing and externalizing problems.

Conclusions: These findings underscore the importance of early maternal parenting stress as a predictor of long-term emotional and behavioral difficulties in children, emphasizing the need for early intervention programs that support maternal mental health and children's emotional development.