2018 National Immunization Survey - Child (NIS-Child)
Public-Use Data File (PUF)
WARNING - DATA USE RESTRICTIONS - READ CAREFULLY BEFORE USE!
The Public Health Service Act (Section 308(d)) provides that the
data collected by the National Center for Immunization and
Respiratory Diseases (NCIRD), Centers for Disease Control and
Prevention (CDC), may be used only for the purpose of health
statistical reporting and analysis.
Any effort to determine the identity of any reported case is
prohibited by this law.
NCIRD does all it can to ensure that the identity of data subjects
cannot be disclosed. All direct identifiers, as well as any
characteristics that might lead to identification, are omitted
from the data files. Any intentional identification
or disclosure of a person or establishment violates the assurances
of confidentiality given to the providers of the information.
Therefore, users will:
1. Use the data in these data files for statistical reporting and
analysis only.
2. Make no use of the identity of any person or establishment
discovered inadvertently and advise the Director, NCIRD, of
any such discovery (1 (800) 232-4636).
3. Not link these data files with individually identifiable data
from other NCIRD or non-NCIRD data files.
By using these data, you signify your agreement to comply with
the above requirements.
INTRODUCTION
The National Immunization Survey - Child (NIS-Child) is sponsored and
conducted by the National Center for Immunization and Respiratory Diseases
(NCIRD). The NIS-Child is a list-assisted random-digit-dialing telephone
survey of households followed by a mailed survey to children�s immunization
providers that began data collection in April 1994 to monitor childhood
immunization coverage.
The target population for the NIS-Child is children between the ages of
19 and 35 months living in the United States at the time of the interview.
Data from the NIS-Child are used to produce timely estimates of vaccination
coverage rates for all childhood vaccinations recommended by the Advisory
Committee on Immunization Practices (ACIP). A public-use data file (PUF) is
available for each year beginning with 1995.
See this website for more information:
http://www.cdc.gov/vaccines/imz-managers/nis/about.html
CONTENT OF THE 2018 NIS-CHILD PUF
The files listed below can be found at this location:
http://www.cdc.gov/vaccines/imz-managers/nis/datasets.html
The overall package consists of eight computer files, as follows:
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NAME.TYPE File Description
Size (KB)
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NISPUF18README.TXT 9 2018 Readme File (this text)
NISPUF18DUG.PDF 2,327 2018 NIS-Child PUF Data User's Guide
(Adobe Acrobat format)
NISPUF18CODEBOOK.PDF 3,301 2018 NIS-Child PUF Data Documentation,
Codebook, and Frequencies
(Adobe Acrobat format)
NISPUF18.DAT 23,653 2018 NIS-Child PUF Dataset (ASCII format)
NISPUF18.SAS 69 2018 SAS Input Statements (ASCII format)
NISPUF18.R 83 2018 R Input Statements (ASCII format)
NISPUF18HHQUEX.PDF 518 2018 NIS-Child Household Questionnaire
(Adobe Acrobat format)
NISPUF18IHQ.PDF 896 2018 NIS-Child Immunization History Questionnaire
(Adobe Acrobat format)
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The 2018 NIS-Child public-use data file is available in ASCII format.
A SAS program (in ASCII format) is provided to facilitate reading
the ASCII data file and creating a SAS dataset. The SAS program
contains, for each variable in the ASCII file, the variable name,
its starting position and end position, labels, and formats.
An R program (in ASCII format) is also provided to facilitate
reading the ASCII data file and creating an R dataset. The R
program contains, for each variable in the ASCII file, the
variable name, its starting position and end position, labels,
and formats.
The data file NISPUF18.DAT can be used for processing by
statistical software packages that accept ASCII-formatted input,
or it can be transferred to another computer for processing.
For more information about the 2018 NIS-Child PUF, data users should
consult the 2018 NIS-Child PUF Data User's Guide and the 2018 NIS-Child
PUF Data Documentation, Codebook, and Frequencies. Users of these
data must review that descriptive and explanatory documentation to
analyze the data correctly. These documents are available in PDF
format.
The 2018 NIS-Child PUF Data User's Guide provides detailed information
about the design of the 2018 NIS-Child sample, the questionnaires, the
weighting and estimation procedures, and other important
information needed for analyzing these data.
The 2018 NIS-Child PUF Data Documentation, Codebook and Frequencies
contains indexes of the variables (in both data-file-position
order and alphabetical order), the variable responses, and
either unweighted frequencies of categorical variables or
unweighted summary statistics for continuous variables.
The 2018 NIS-Child files are large. Please use caution and check the
capacity of your disk drive before downloading them.
Documents in PDF format can be viewed with Adobe Acrobat software.
The Adobe Acrobat Reader can be downloaded from the Adobe Acrobat
website at:
http://get.adobe.com/reader
UNIQUE IDENTIFIERS AND WEIGHTING
The unique household identification number is SEQNUMHH.
The unique child identification number is SEQNUMC.
SEQNUMC consists of 6 digits: the first five digits are
SEQNUMHH and the sixth digit uniquely
identifies the child within the household.
In 2018, the NIS-Child PUF contains interviews collected by cell phones only.
To produce estimates for the U.S. proper, the RDD-phase sampling weight is
called RDDWT_C, and the provider-phase sampling weight for children with
adequate provider data is called PROVWT_C. Data for the U.S. territories
are not included on the 2018 NIS-Child PUF.
IMMUNIZATION COVERAGE RATES
Estimates of vaccination coverage rates from the 2018 NIS-Child are
available at:
http://www.cdc.gov/vaccines/imz-managers/coverage/childvaxview/index.html
GUIDELINES FOR CITATION OF DATA
With the goal of mutual benefit, the National Center for Immunization and
Respiratory Diseases (NCIRD) requests that recipients of data files
cooperate in certain actions related to their use. Any published
material derived from these data should acknowledge CDC (NCIRD)
as the original data source and use "NIS-Child" in the title or as a
keyword in the abstract. The suggested citation to appear at the
bottom of all tables is as follows:
Source: CDC, NCIRD (2020), 2018 National Immunization
Survey - Child.
The reference for the 2018 NIS-Child data file is:
U.S. Department of Health and Human Services (DHHS).
National Center for Immunization and Respiratory Diseases.
The 2018 National Immunization Survey - Child.
Atlanta, GA: Centers for Disease Control and Prevention, 2020.
http://www.cdc.gov/vaccines/imz-managers/nis/datasets.html
Published material should also include a disclaimer that
attributes any analyses, interpretations, or conclusions reached
to the author (recipient of the data file) and not to NCIRD,
which is responsible only for the initial data. Consumers who
wish to publish a technical description of the data should
ensure that the description is consistent with that published
by NCIRD.
Although the data files have been edited carefully, errors may be
detected. Please notify NCIRD staff (1 (800) 232-4636) of any errors
in the 2018 NIS-Child data or documentation and refer to the NCIRD
website at http://www.cdc.gov/vaccines/imz-managers/nis/index.html
for updates to the NIS data files.
For additional information on the NIS-Child public-use data file, please
contact the NCIRD Information Dissemination staff:
Information Dissemination Staff, NCIRD
1600 Clifton Road
Atlanta, GA 30333
Phone: 1 (800) 232-4636
Email: cdcinfo@cdc.gov
Internet: http://www.cdc.gov/vaccines/imz-managers/nis/index.html