Psychophysiological activity and reactivity in children and adolescents with conduct problems: A systematic review and meta-analysis

•Meta-analysis on conduct problems and Autonomic Nervous System activity at baseline or reactivity during tasks.•Co-inhibition of parasympathetic and sympathetic reactivity to emotional tasks is associated with high levels of CP.•Correlational studies point to reduced baseline heart rate and heart rate activity in relation to CP. The aim of this study was to conduct a systematic review of the literature and meta-analysis to estimate the association between psychophysiological activity and reactivity at baseline or after a psychological task with conduct problems (CP) among children and adolescents. We systematically reviewed published studies reporting autonomic nervous system activity in youth with CP and meta-analyzed the relationship between CP and autonomic baseline as well as task-related reactivity in 66 studies (N = 10,227). Across 34 included case-control studies that were based on CP cut-off scores, we found a significant pooled effect for task related Skin-Conductance, Respiratory Sinus Arrhythmia, and cardiac Pre-Ejection Period, but no significant group differences for Heart Rate nor for any baseline measures. Findings suggested reduced parasympathetic and sympathetic reactivity to emotional tasks, pointing to co-inhibition of the two systems. However, across 32 studies with correlational design we only found a significant negative correlation of baseline and task-related heart rate with CP. The present meta-analysis derived several conclusions that have the potential to inform biological vulnerability models and biologically driven interventions.