QUOTE : When their subjects were between the ages of three and eleven, the researchers, led by the psychologists Avshalom Caspi and Terrie Moffitt and including Brent Roberts, used a variety of tests and questionnaires to measure the children’s self-control and then combined those results into a single self-control rating for each child. When they surveyed the subjects at age thirty-two, they found that the childhood self-control measure had predicted a wide array of outcomes. The lower a subject’s self-control in childhood, the more likely he or she was at thirty-two to smoke, to have health problems, to have a bad credit rating, and to have been in trouble with the law. In some cases, the effect sizes were huge: Adults with the lowest self-control scores in childhood were three times more likely to have been convicted of a crime than those who scored highest as kids. They were three times more likely to have multiple addictions, and they were more than twice as likely to be raising their children in a single-parent household.