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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

Crowd of people walking street - decorative
January 15, 2026

New Data Available from Add Health

Add Health is excited to announce the release of three new biomarker datasets: Wave VI Biomarker Weights Wave VI Renal Function Wave VI Neurodegeneration In...
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January 9, 2026

Loneliness During Adolescence and Subsequent Health and Well-Being in Adulthood: An Outcome-Wide Longitudinal Approach

Using nationally representative data from Waves I, II, IV, and V of the National Longitudinal Study of Adolescent to Adult Health (Add Health), Dr. Kim...
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December 19, 2025

Wave V Epigenetic Clocks Data Now Available

Add Health is excited to announce the following data are now available: Wave V Epigenetic Clocks: Biological aging measures were derived from DNA methylation data...
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