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Social, Behavioral, and Biological Linkages Across the Life Course

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On March 31, 2025, as a sponsor of this project, NIH requested that the following language be added to this website: This repository is under review for potential modification in compliance with Administration directives.

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The National Longitudinal Study of Adolescent to Adult Health (Add Health) is a longitudinal study of a nationally representative sample of over 20,000 adolescents who were in grades 7-12 during the 1994-95 school year and have been followed for six waves of data collection to date, most recently in 2022-25.

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Key Resources

User Guides

Detailed documentation designed to help users understand the study design, data sets, and guidelines for analyzing the data.

Codebooks

PDF codebooks for coding responses and documenting the layout and code definitions of the data files.

Add Health Navigator

Metadata discovery tool to explore and create custom codebooks, as well as provide a wave to wave variable comparison for Waves I-VI.

Public-Use Data Sets

Access and download the public use codebooks and data sets which contain a reduced sample size (Waves I-VI).

Restricted-Use Data Sets

Access the data sets available via restricted-use contract, renew contract, add researchers, and transfer or terminate contract. Data linkages are not allowable with a restricted-use contract.

Ancillary Studies

Submit an application to add new contextual or biological data to the Add Health data sets, including data linkages.

News and Announcements

Group of cheerful diverse people
July 14, 2022

2022 Add Health Users Conference Presentations

Thank you to all our amazing staff, presenters, moderators, and attendees for making the 2022 Add Health Users Conference a huge success! We had a...
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happy woman presenting
June 9, 2022

2022 Add Health Users Conference Final Agenda

The final agenda for the 2022 Add Health Users Conference is now available. The conference program features over 40 presentations by investigators who are conducting...
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childs hands reaching out and begging
April 20, 2022

Add Health Director, Dr. Robert Hummer, contributes op-ed in “The Hill”

“America’s kids are not all right — we need urgent action to save young lives,” the title of a recent op-ed in The Hill by Add...
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