Health and Retirement Study (HRS)

California Health Interview Survey (CHIS)

Vaccine Safety Datalink (VSD)b

The University of Michigan HRS surveys more than 22,000 Americans over the age of 50 every two years. The survey collects data on Americans’ physical and mental health, insurance coverage, financial status, family support systems, labor-market status, and retirement planning.

Registered users can download HRS public data products free.

Restricted-release files contain sensitive information that can be made available only under specified conditions.

CHIS is a telephone survey of adults, adolescents, and children from all parts of the state of California. The survey is conducted every two years.

Some of the data collected are prepared for public release as free public-use files. The files are designed to minimize the risk of respondent identification yet preserve the broadest range of descriptive demographic data.

Restricted-use files at CHIS are available at the Data Access Center (DAC) and contain detailed geographic identifiers and full demographic descriptions for the survey respondents from the 2001 survey. The files also include responses to sensitive questions that are excluded from the public-use data files.

The VSD is a large linked database that was developed in 1991 by the collaborative efforts of CDC and several private MCOs.

The VSD currently includes data from administrative records for more than 7 million members of eight MCOs. In the VSD, vaccination records, patient characteristics, and health outcomes are linked, allowing the VSD to serve as a unique and potentially powerful resource for the continuing evaluation of vaccine safety.

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