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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

June 2, 2026

Volunteering and Cardiometabolic Outcomes: Evidence from the Add Health Study

Research shows that social determinants of health significantly impact disparities in cardiometabolic diseases, like diabetes, but most of this research does not examine positive determinants....
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May 29, 2026

New Wave VI Bio Data Available

Add Health is excited to announce the following data are now available: Wave VI Inflammation and Immune Function: This file contains constructed measures designed to...
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May 13, 2026

Peer Influence on Smoking Behaviors Across Social Networks: Evidence from the Add Health Study

Smoking behavior among adolescents is influenced by their social networks. Using data from two high schools with different network structures in Add Health, Wang et...
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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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