Study Design

Add Health is a school-based longitudinal study of a nationally-representative sample of adolescents in grades 7-12 in the United States in 1994-95. Over more than 20 years of data collection, data have been collected from adolescents, their fellow students, school administrators, parents, siblings, friends, and romantic partners through multiple data collection components. In addition, existing databases with information about respondents’ neighborhoods and communities have been merged with Add Health data, including variables on income and poverty, unemployment, availability and utilization of health services, crime, church membership, and social programs and policies.

The Add Health Research Design PowerPoint (Waves I-V) and the Add Health Study: Design and Accomplishments paper (Waves I-IV) provide detailed information about the study design.