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Johnson-Neyman Plot of the Indirect Effect of HRV Reactivity X Callous-Unemotional Traits on Drug Use Problems. Note. ΔHRV = Residualized change score of heart rate variability. The shadowed region indicates that for participants with higher levels of HRV reactivity (i.e. lower ΔHRV scores), the indirect effect of child maltreatment on drug use problems through callous-unemotional traits is significant
