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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

September 11, 2024

New Data Format for Add Health Restricted-Use Data

Add Health is excited to announce that beginning in September 2024, we will  release restricted-use data in SAS7BDAT format instead of SAS Transport XPT format....
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August 2, 2024

Add Health Study featured in The Guardian

A recent article published by The Guardian references a study conducted by Add Health Deputy Director, Dr. Allison Aiello, and fellow researchers exploring the impacts...
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June 18, 2024

2024 Users Conference On-site Information

Check in: Beginning at 8:00AM on June 17th, you can sign in at the registration desk to receive your name badge and conference materials. The...
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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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