2015 Restricted-Use Linked Mortality Files
NCHS survey data have been linked to the NDI data containing information on mortality status, date of death, and cause of death. Unlike the public-use files the restricted-use files have information on adults and children and the data were not subjected to perturbation techniques. The restricted-use Linked Mortality File (LMF) has been updated with mortality follow-up data through December 31, 2015.
Descriptions of the NDI mortality data that have been linked to NCHS survey data can be found in the following online report:
NCHS-NDI Matching Methodology and Analytic Considerations pdf icon[PDF – 2 MB]
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 proposal to the RDC. Please see the RDC web site for instructions on submitting a proposal (RDC website).
To avoid risk of participant re-identification researchers are not allowed to use Public-use and Restricted-use Linked Mortality Files, together, in the RDC.
Restricted-Use Data Dictionaries:
- Mortality Variables pdf icon[PDF – 282 KB]
- Death Certificate and NDI Match Variables pdf icon[PDF – 171 KB]