Looking for some information I came upon this information I thought was interesting:
According to a 1994 study by the Search Institute, a Minneapolis-based public policy research organization providing leadership, knowledge and resources to promote healthy children, youth and communities. This study, the largest examination of adopted adolescents yet undertaken, concludes:
* Adopted children score higher than their middle-class counterparts on indicators of school performance, social competency, optimism and volunteerism.
* Adopted adolescents generally are less depressed than children of single parents and less involved in alcohol abuse, vandalism, group fighting, police trouble, weapon use and theft.
* Adopted adolescents score higher than children of single parents on self-esteem, confidence in their own judgment, self-directedness, positive view of others and feelings of security within their families.
* On health measures, adopted children and children of intact families share similarly high scores, and both those groups score significantly higher than children raised by single parents.
* Seven percent of children adopted in infancy repeated a grade, while 12 percent of children living with both biological parents repeated a grade.
* Compared with the general child population, children placed with adoptive couples are better off economically.