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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.

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News and Announcements

February 22, 2021

New Data Release from Add Health

The following data are now available to Add Health contract researchers. HUD-Assisted Housing Supplemental Data. The supplementary data-file identifies Add Health respondents who lived in...
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Gut bacteria
January 7, 2021

New study finds a link between premature aging and gut bacteria using Add Health Wave V data

Linkages between microbiota and physiologic aging and age-related disease have typically been examined in older adults.  However, recent evidence indicates biological aging likely begins as...
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student in wheelchair receives a diploma from a university. disabled girl with a diploma from school and university.
June 26, 2020

Researchers use Add Health data to discover connections between chronic medical conditions and the importance of belonging

Students with chronic medical conditions struggle with more than just their physical health. The hurdles formed from medical conditions impact their school attendance, concentration, and...
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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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