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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

July 16, 2026

Society for Prevention Research data challenge competition features Add Health

Each year at their annual meeting, the Society for Prevention Research (SPR) sponsors a friendly competition among teams of early-career researchers. Named for two of...
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July 7, 2026

Persistent Infections and Biological Aging: Evidence from the Add Health Study

Widespread persistent infections have been found to elicit chronic immune activation, with implications for the body’s immune system and biological functions as people age. Using...
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June 8, 2026

Former Add Health Director, Kathleen Mullan Harris, this year’s recipient of the American Sociological Association’s Sociology of Population Section Distinguished Career Award

Few scholars have shaped the sociology of population as profoundly as Kathleen Mullan Harris. As Director and Principal Investigator of the National Longitudinal Study of...
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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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