2005 National Immunization Survey (NIS) 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 Health Statistics (NCHS), 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. NCHS 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, NCHS, of any such discovery (301-458-4500). 3. Not link these data files with individually identifiable data from other NCHS or non-NCHS data files. By using these data, you signify your agreement to comply with the above requirements. INTRODUCTION The National Immunization Survey (NIS) is sponsored by the National Center for Immunization and Respiratory Diseases (pending, NCIRD) and conducted jointly by NCIRD and the National Center for Health Statistics (NCHS), Centers for Disease Control and Prevention. The NIS 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 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 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/nis CONTENT OF THE 2005 NIS PUF The files listed below can be found at this location: http://www.cdc.gov/nis/datafiles.htm The overall package consists of five computer files, as follows: --------------------------------------------------------------------------------- NAME.TYPE File Description Size (KB) --------------------------------------------------------------------------------- NISPUF05_README.TXT 8 2005 Readme File (this text) NISPUF05_DUG.PDF 3,698 2005 NIS PUF Data User's Guide (Adobe Acrobat format) NISPUF05_CODEBOOK.PDF 595 2005 NIS PUF Data Documentation, Codebook, and Frequencies (Adobe Acrobat format) NISPUF05.DAT 19,507 2005 NIS PUF Dataset (ASCII format) NISPUF05.SAS 57 2005 SAS Input Statements (ASCII format) --------------------------------------------------------------------------------- The 2005 NIS public-use data file is available in ASCII format. The actual file is in a compressed format and can be expanded using WinZip or other software. 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 width, labels, and formats. The data file NISPUF05.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 2005 NIS PUF, data users should consult the 2005 NIS PUF Data User's Guide and the 2005 NIS 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 2005 NIS PUF Data User's Guide provides detailed information about the design of the 2005 NIS sample, the questionnaires, the weighting and estimation procedures, and other important information needed for analyzing these data. The 2005 NIS 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 2005 NIS files are large. Please use caution and check the capacity of your disk drive before downloading them. The 2005 NIS data files are also located at: ftp://ftp.cdc.gov/pub/Health_Statistics/NCHS/Datasets/NIS/ 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://www.adobe.com/products/acrobat/readstep2.html 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 2005, the RDD-phase sampling weights are called RDDWT, and the provider-phase sampling weights of children with adequate provider data are called PROVWT. IMMUNIZATION COVERAGE RATES Estimates of vaccination coverage rates from the 2005 NIS are available at: http://www.cdc.gov/nip/coverage/ GUIDELINES FOR CITATION OF DATA With the goal of mutual benefit, the National Center for Health Statistics (NCHS) and the National Center for Immunization and Respiratory Diesease, (pending, NCRID) request that recipients of data files cooperate in certain actions related to their use. Any published material derived from these data should acknowledge CDC (NCHS and NCIRD) as the original data source and use "NIS" 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, NCRID (proposed) and NCHS (2006), 2005 National Immunization Survey. The reference for the 2005 NIS data file is: U.S. Department of Health and Human Services (DHHS). National Center for Health Statistics. The 2005 National Immunization Survey. Hyattsville, MD: Centers for Disease Control and Prevention, 2006. http://www.cdc.gov/nis/datafiles.htm 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 NCHS, 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 NCHS. Although the data files have been edited carefully, errors may be detected. Please notify NCHS staff (301-458-4636) of any errors in the 2005 NIS data or documentation and refer to the NCHS website at www.cdc.gov/nis for updates to the NIS data files. For additional information on the NIS public-use data file, please contact the NCHS Information Dissemination staff: Information Dissemination Staff, NCHS 3311 Toledo Road Hyattsville, MD 20782 Phone: 301-458-INFO (4636), toll free 1-866-441-NCHS (6247) E-mail: nchsquery@cdc.gov Internet: http://www.cdc.gov/nchs/