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Social, Behavioral, and Biological Linkages Across the Life Course

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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. Wave VII began in fall 2026.

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News and Announcements

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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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Key Resources

Study Documentation

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

Data Documentation

A comprehensive resource that catalogs all available datasets, including file details, access information, data user guides and codebooks defining variables and data layout.

Add Health Codebook Explorer

Use the Add Health Codebook Explorer (ACE) to view questions asked of respondents, parents, and interviewers during the In-School and In-Home interviews in Waves I through V.

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.

Study Design

Documentation detailing the study design of each wave of data collection, including sampling and fieldwork information.

NIH Message

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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