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Trajectories of delinquency symptoms across middle and late childhood were examined through latent growth modeling, with a focus on the role of interactions among parental marital conflict, child sex, and multiple indices (baseline, reactivity) of either parasympathetic nervous system activity, indexed by respiratory sinus arrhythmia (RSA), or sympathetic nervous system activity, indexed by skin conductance level (SCL), as predictors of growth. At Time 1, 128 girls and 123 boys (mean age = 8.23 yrs ± 0.73) and their parents participated. The sample comprised 64% European American and 36% African American children. Families participated in second and third waves of data collection with a 1-year lag between each wave. Interactions among marital conflict, sex, baseline RSA, and RSA reactivity from baseline to a frustrating lab task were significant predictors of growth in delinquent behavior from age 8 to age 10, with overall patterns indicating increasing symptoms for boys who lived in high-conflict homes and had an RSA response profile comprising lower RSA during the baseline and RSA augmentation (increase from baseline to the frustrating task). Furthermore, increases in delinquency symptoms over time were observed for children from high-conflict homes and with an SCL profile characterized by higher baseline levels and lower reactivity (less pronounced SCL increases from baseline) to the frustrating task. Findings highlight the importance of contemporaneous assessments of resting and reactivity levels when examining relations among the environment, physiological functioning, and psychopathology. Results are discussed in the context of interactions between biology and environment as relevant to the development of psychopathology.

Developmental trajectories of delinquency symptoms in childhood: The role of marital conflict and autonomic nervous system activity.