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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

DNA Code
July 28, 2021

Data Release: Polygenic Index Inventories

The following data are now available to Add Health contract researchers. Polygenic Index Inventories Polygenic scores computed by the SSGAC consortium for anthropometric traits, cognition/education,...
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pedestrians on city crosswalk
June 7, 2021

New Data Release

The following data are now available to Add Health contract researchers.  Wave I State Demographic Characteristics, Exclusionary Indices, and Inclusionary Indices These data provide measures...
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Woman at a virtual conference.
May 6, 2021

Register for the 2021 Add Health Virtual Workshop

Registration is now open for the 2021 Add Health Virtual Workshop. Join us on Monday, July 26, 2021, from 1:00 PM to 4:30 PM for...
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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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