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 Despite increased abilities across developmental realms, including the maturation of pain systems involving self-regulation and the coordination of affect and cognition, the transition to young adulthood is accompanied by higher rates of mortality, greater engagement in health-damaging behaviors, and an increase in chronic conditions.  Rates of motor vehicle fatality and homicide peak during young adulthood, as do mental health problems, substance abuse, unintentional pregnancies, and sexually transmitted infections.