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Data Access

Public-Use Data Files and Documentation

The National Center for Health Statistics (NCHS) is pleased to offer downloadable public-use data files through the Centers for Disease Control and Prevention's (CDC) FTP file server. Users of this service have access to data sets, documentation, and questionnaires from NCHS surveys and data collection systems. Downloading instructions are available in "readme" files.

Public-use data files are prepared and disseminated to provide access to the full scope of the data. This allows researchers to manipulate the data in a format appropriate for their analyses. NCHS makes every effort to release data collected through its surveys and data systems in a timely manner.

Users of NCHS public-use data files must comply with data use restrictions to ensure that the information will be used solely for statistical analysis or reporting purposes.


National Health and Nutrition Examination Survey (NHANES)


National Health Care Surveys


National Vital Statistics System (NVSS)


National Survey of Family Growth (NSFG)


National Health Interview Survey (NHIS)


National Immunization Survey (NIS)


Longitudinal Studies of Aging (LSOA)


State and Local Area Integrated Telephone Survey (SLAITS)


NCHS Data Linkage


Compressed Mortality File


Space Program



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