82. Van Hulle, C.A., Corley, R., Zahn-Waxler, C., Kagan, J., & Hewitt, J.K. (2000). Early childhood heart rate does not predict behavior problems at age 7 years. Journal of the American Academy of Child and Adolescent Psychiatry, 39, 1238-1244.

It has been found in some previous studies that heart rate recorded as early as age 3 years could predict externalizing behavior at age 11 years. In this study, heart rate recorded at ages 14, 20, 24, 36 months and 7 years was used to predict parental ratings on behavior scales and composites from the Child Behavior Checklist for subjects participating in the MacArthur Longitudinal Twin Study. In contrast to those previous findings, in this sample heart rate did not predict externalizing behavior at age 7.