A:\NHEFS 1992 FTP Server README File.wpd 1992 NHANES I Epidemiologic Followup Study (NHEFS) Data Files and File Documentation WARNING - DATA USE RESTRICTIONS! Read Carefully before Using 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 assure 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 dataset. 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 this dataset 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. 3. Not link this dataset with individually identifiable data from other NCHS or non-NCHS datasets. By using these data, you signify your agreement to comply with the above-stated statutorily based requirements. * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * The files listed below comprise the 1992 NHANES I Epidemiologic Followup Study (NHEFS) data files. The data files are in ASCII Format and the documentation files are in WordPerfect 5.1/5.2 format. The 1992 NHEFS datasets are located in: ftp://ftp.cdc.gov/pub/Health_Statistics/NCHS/Datasets/NHEFS/NHEFS92 The documentation files for the 1992 NHEFS datasets are located in: ftp://ftp.cdc.gov/pub/Health_Statistics/NCHS/Dataset_Documentation/NHEFS/NHEFS92 For ease of transmission, the 1992 NHEFS datasets have been converted into a self-extracting compressed format. To load and expand any of the NHEFS data files, do the following: First, copy the compressed file onto your hard drive into an appropriate subdirectory. For example, the data file INT92DAT.EXE should be copied into a subdirectory called INT92. Then, go to that directory and type INT92DAT without the EXE extension. INT92DAT.EXE will extract into the file INT92.DAT. This file can then be used for processing by PC SAS or uploaded to a mainframe computer for processing. The five datasets listed below have each been compressed into self-extracting files. To load and expand each of them, follow the steps above using the appropriate file name. WARNING: The INTERVIEW is extremely large in size, please use caution as far as disk drive capacity when extracting! Additionally, please use caution when uploading to a mainframe, transmission time is extremely long depending on hardware and software used. 1992 NHEFS Data Files Approximate Size (KILOBYTES) Filename Description of Component File Format Compressed Uncompressed INT92.DAT Interview Data File ASCII 2,609 KB 75,000 KB VITLTR92.DAT Vital and Tracing Data ASCII 640 KB 3,947 KB MORT92.DAT Mortality Data File ASCII 183 KB 1,987 KB HCF92.DAT Health Care Facility Data ASCII 44 KB 4,531 KB HCFSUP92.DAT Health Care Facility Supp Data ASCII 18 KB 30 KB For ease of transmission, the 1992 NHEFS data documentation files have been converted into a self-extracting compressed format. To load and expand any of the NHEFS data documentation files, do the following: First, copy the compressed file onto your hard drive into an appropriate subdirectory. For example, the documentation files INT92INT.EXE should be copied into a subdirectory called INT92. Then go to that directory and type INT92INT without the EXE extension. INT92INT.EXE will extract into the file INT92INT.DOC. This file can then be brought into a wordprocessor. The eleven documentation files listed below have each been compressed into self-extracting files. To load and expand each of them, follow the steps above using the appropriate file name. NOTE: Due to its size, the 1992 NHEFS Interview documentation has been divided into several portions for ease in transmission. 1992 NHEFS Documentation Files Approximate Size (KILOBYTES) Filename Description of Component File Format Compressed Uncompressed INT92INT.DOC Interview Introduction WordPerfect 5.1/5.2 16 KB 56 KB INT92FL1.DOC Interview File Layout WordPerfect 5.1/5.2 84 KB 832 KB Pages 25-509 File Positions 1-4933 INT92FL2.DOC Interview File Layout WordPerfect 5.1/5.2 11 KB 130 KB Pages 510-581 File Positions 4934-5736 INT92FL3.DOC Interview File Layout WordPerfect 5.1/5.2 14 KB 173 KB Pages 582-680 File Positions 5737-6917 INT92FL4.DOC Interview File Layout WordPerfect 5.1/5.2 7 KB 65 KB Pages 681-716 File Positions 6918-7954 INT92SUM.DOC Interview File Layout WordPerfect 5.1/5.2 7 KB 40 KB Pages 717-733 File Positions 7955-8074 INT92FIG.DOC Interview Figures WordPerfect 5.1/5.2 1 KB 5 KB VITLTR92.DOC 1992 Vital and Tracing WordPerfect 5.1/5.2 21 KB 116 KB Status - Intro/File Layout MORT92.DOC 1992 Mortality WordPerfect 5.1/5.2 20 KB 81 KB Intro/File Layout HCF92.DOC 1992 Health Care Facility WordPerfect 5.1/5.2 31 KB 117 KB Stay - Intro/File Layout HCFSUP92.DOC 1992 Health Care Facility WordPerfect 5.1/5.2 23 KB 84 KB Supplemental - Intro/File Layout CAUTION - Public use data tapes are available for each of the four completed waves of NHEFS. However, at this time only the five public use data tapes released for the 1992 NHEFS are available via the FTP server. The 1982-84, 1986, and 1987 Interview and Health Care Facility Stay Public Use Data Tapes must still be purchased through NTIS. The 1992 NHEFS Vital and Tracing Status Public Use Data Tape contains vital status, tracing and demographic information on all examined subjects 25 years or older at NHANES I (n=14,407). It also provides users with information on the availability of different survey components for each of the four followup periods for each subject. The 1992 Mortality Data tape contains death certificate information collected for each followup period (1982-84, 1986, 1987, and 1992) coded according to ICD-9 multiple-cause-of-death procedures for all 4,497 NHEFS decedents identified through 1992. A survey period identifier variable is provided to allow the researcher to select mortality information for each of the four followup periods. The 1992 Interview data tapes contain information collected from the subject and proxy interviews conducted during the 1992 NHEFS data collection period. The 1982-84, 1986, and 1987 Interview tapes (available from NTIS) contain the interview information collected during each of these earlier NHEFS survey periods. When merged together, these files provide a complete followup health history for each subject from baseline through the last completed interview. The 1992 Health Care Facility Stay tape contains information collected regarding overnight stays in health care facilities reported during the 1992 NHEFS survey period. The Supplemental Health Care Facility Stay data tape has been created to provide information which was received during the 1992 followup period but which describes overnight facility stays that occurred prior to the 1992 followup period. The 1982-84, 1986, and 1987 Health Care Facility tapes (available from NTIS) contain information collected for overnight health care facility stays reported during the previous NHEFS data collection periods. When all five Health Care Facility Stay data files are merged together, they provide a history of all reported hospitalizations and institutionalizations from baseline through 1992. Data from the 1992 NHEFS public use data tapes should be linked to the 1982-84, 1986, and 1987 NHEFS and NHANES I public-use data files for the proper analysis of longitudinal data. Data users are directed to consult the Vital and Statistics Series 1 Reports Nos. 22, 25, 27 and 35 for information regarding the plan and operation of the NHEFS surveys. A Vital and Health Statistics Series 2, Report No. 121 has been issued to assist data users with resolving statistical issues and the proper use of sample weights when analyzing the NHEFS data. Please refer to http://www.cdc.gov/nchswww/products/products.htm for additional information on these Reports. The data collected in the NHEFS surveys is longitudinal by design and therefore should, in most cases, not be used to provide prevalence estimates. For questions, suggestions, or comments concerning NHEFS data, please contact: Christine S. Cox Population Epidemiology Branch Office of Analysis, Epidemiology, and Health Promotion National Center for Health Statistics Centers for Disease Control and Prevention 6525 Belcrest Road, Room 730 Hyattsville, MD 20782 Email: csc3@cdc.gov For additional information on NCHS data products, contact the: Data Dissemination Branch, NCHS 6525 Belcrest Rd. Hyattsville, MD 20782 Tel: (301) 436-8500 E-mail: nchsquery@cdc.gov Internet: http://www.cdc.gov/nchswww/nchshome.htm Statement of Authenticity This material has been cleared for public distribution by CDC/ATSDR and will be authentic if obtained directly from ftp.cdc.gov. CDC/ATSDR takes all effort to assure the authenticity of electronically distributed documents. However, in all instances where the electronic and official agency record differ, the authenticity of the official agency record is controlling.