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Data Access

Data Files and Data Dictionaries

Except for the NHEFS and the NHANES II, the NCHS Linked Mortality Files are available as both public-use and restricted-use data sets. The NHEFS and the NHANES II Linked Mortality Files are only available as restricted data sets.


2011 Restricted-use Data - Updated data now available

Includes detailed mortality information and mortality follow-up for children. Additional death certificate data are also available. The restricted-use versions of the Linked Mortality Files were not ssubjected to data perturbation techniques.

Data Availability

Due to confidentiality requirements, the Restricted-use Linked Mortality Files are accessible only through the NCHS Research Data Center (RDC). All interested researchers must submit a research proposalto the RDC. Please see the RDC web page for instructions on submitting a proposal (RDC website.) Researchers will not be allowed to use Public-use and Restricted-use Linked Mortality Files together in the RDC.

Restricted-use Linked Mortality File Documentation.


2006 Public-use Data – Updated 2011 data available in 2014

Includes a limited set of mortality variables for adult participants only. The public-use versions of the NCHS Linked Mortality Files were subjected to data perturbation techniques to reduce the risk of participant re-identification. Synthetic data was substituted for the actual date and underlying cause of death for selected decedent records. Information regarding vital status was not perturbed.


Comparability of 2006 Public-use and Restricted-use Data Files [PDF - 136 KB]


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