Anyone heard of
The Dunedin Study
They studied a cohort of 1073 babies born at Dunedin in 1972 and followed and studied hem for now over 45 years.
Surprisingly the cohort remaining in the study is just under 1000 or 92%
The study looked at wide ranging questions.
One study was on child self control:
Early child self control predicts positive health at age 32 (when they looked at the results), wealth and criminality.
Differences between particip[ants in self control are predictive of health, wealth and crime across 32 years in both genders - even if controlled for variations in IQ, socioeconomic status and home envorinment. While low self control in childhood predicts poor outcomes in adulthood, children with low self control can exceed their higher self control cohorts by learning or gaining self control through intervention.
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