You are here: Home / Data / Restricted-Use Data

About Restricted-Use Contractual Data

The more extensive restricted-use data, available by contractual agreement, will be distributed only to certified researchers who commit themselves to maintaining limited access. To be eligible to enter into a contract, researchers must have an IRB-approved security plan for handling and storing sensitive data and sign a data-use contract agreeing to keep the data confidential. Contractual data are provided in separate, linkable datasets and contain a hidden signature identifying the purchaser.

For detailed descriptions of the restricted-use datasets, go to Dataset Descriptions.


Use this guide for navigating the index and codebook resources available on the website.

Please note public-use pdf codebook frequencies will not match Add Health Codebook Explorer (ACE) or restricted-use pdf codebook frequencies, as the ACE tool contains restricted-use data frequencies and public data is only a subset of the data.


Getting Restricted-Use Contractual Data

To apply for restricted-use data, please download the contract application and return to the .  Please see our Contracts Homepage or FAQ about contracts if you have any questions.