National Longitudinal Study of Adolescent Health (Add Health), 1994-2008: Core Files [Restricted Use]

The National Longitudinal Study of Adolescent Health (Add Health) is a longitudinal study of a nationally representative sample of adolescents in grades 7-12 in the United States during the 1994-1995 school year. The Add Health cohort has been followed into young adulthood with four in-home interviews, the most recent in 2008, when the sample was aged 24-32. Add Health combines longitudinal survey data on respondents' social, economic, psychological, and physical well-being with contextual data on the family, neighborhood, community, school, friendships, peer groups, and romantic relationships, providing unique opportunities to study how social environments and behaviors in adolescence are linked to health and achievement outcomes in young adulthood. The fourth wave of interviews expanded biological linkages in health trajectories as the Add Health cohort ages through adulthood. The Add Health core data files are comprised of the Waves I-IV In-Home Interview data and corresponding In-Home Interview section detail data; Wave I In-School Questionnaire data, Wave I and II School Administrator data; School Information data; and six Add Health Weights file data. For more information, please see the study website.