National Longitudinal Study of Adolescent HealthCopyrighted by the data's author. "...longitudinal study of a nationally representative sample of adolescents in grades 7-12 in the United States during the 1994-95 school year. The Add Health cohort has been followed into young adulthood with four in-home interviews... social, economic, psychological and physical well-being with contextual data on the family, neighborhood, community, school, friendships, peer groups, and romantic relationships...linked to health and achievement outcomes in young adulthood..."