Abstract
While the link between low self-control and several behavioral and social problems is widely supported, debate remains regarding the stability of and the genetic and environmental sources of variation in self-control. Using data from the Early Childhood Longitudinal Study, Kindergarten Class 1998–1999 restricted data set, a sample of 360 twins was compared to a sample of 423 non-twins in order to examine the stability in self-control. The twin sample was also used to examine the genetic and environmental sources of stability in self-control. Findings indicated two stable classes for both the twin and singleton samples, and substantial stability in average self-control from kindergarten through fifth grade in both samples. The ACE decomposition model indicated strong genetic contributions to self-control (76%) with the remaining variation attributed to non-shared environment. Overall, the data suggest that self-control is identifiable early in life, stable across childhood, increasingly influenced by genes, and thus, is a critical focus for early intervention.
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