Cycle 6 (2002): Other Data Files
When the National Center for Health Statistics (NCHS) collected the data from respondents to the National Survey of Family Growth (NSFG), those respondents were promised that the information they provided would be held “strictly confidential.” The NCHS is legally required to keep that promise. In order to do so, some variables could not be included on Public Use Files, either because they pose additional risk of disclosure or they contain data that would increase the consequences of disclosure. These items are made available to the research community in the following data files:
The three other Cycle 6 NSFG data files are:
The ACASI files include most of the items from the ACASI portion of the NSFG Cycle 6 interview (female section J and male section K). The series on income and sources of income were collected in ACASI, but they are included on the Cycle 6 Public Use Files.
The questions included
in ACASI were largely the same for male and female respondents.
Both male and female respondents were given an opportunity to re-report their experience with pregnancies or fathering pregnancies that were previously reported directly to the interviewer.
All adult respondents (18-44) were asked about non-voluntary sexual intercourse and types of force they may have experienced, if they reported non-voluntary intercourse.
While the main interviewer-administered portion of the NSFG interview was limited to heterosexual vaginal intercourse, in ACASI all respondents were asked about other types of sexual activity, including oral and anal sex and same-sex partners.
The ACASI file data and documentation are available upon request, and without charge. Please make your request by email (email@example.com) or regular mail and provide:
a brief summary, on your organization’s letterhead, of the proposed use of the ACASI data. (If you are a student, a faculty advisor should also provide a letter of support for the proposed research.)
a signed User Agreement, which describes the specific protections in place at your institution that meet the NCHS standards for data users. Each user, including research assistants, should sign the agreement, and these signed agreements should be mailed back to NSFG staff at the address provided below.
For additional information or questions about these files, researchers may contact the NSFG staff directly via mail, e-mail or telephone at:
National Survey of Family Growth
When the NSFG staff has received your signed user agreement(s), you will be sent the ACASI data and documentation on CD-ROM.
The 2000 Census Summary Files are the source of some contextual data, and many of these variables are available at the County, Census Tract, and Block Group levels.
The second source is the County and City Data Book. This information is available only at the county level.
The third source is a file of variables relating to family planning services and the need for services, all at the county level.
The fourth source is a file of rates of selected sexually transmitted diseases (STD’s), also at the county level.
Most of these variables are available for the respondent’s residence at 2 points in time – the date of interview in 2002, and at the date of the census, on April 1, 2000.
The Cycle 6 Contextual Data File Codebook and a list of variables contained on the NSFG Cycle 6 Contextual Data Files, are available for viewing or downloading. Variables with large numbers of missing values are not included in the contextual data files. We also have available for viewing a complete list of variables with missing values for 6,000 or more cases.
Researchers can see the Cycle 5 contextual variable list in a previous NSFG report published by NCHS in April 2003 (see Vital and Health Statistics Series 23, Number 23, by Mosher, Deang, and Bramlett, particularly Appendix II).
Researchers may also request that other variables be added to existing NSFG files in the NCHS Research Data Center. For example, a researcher might add state-level variables indicating provisions of a welfare law or a law relating to health care coverage. (Please contact the NSFG staff for specific instructions). There are charges for the use of the RDC, which are explained at the RDC website.
Researchers may also find useful information for working with NSFG data through the RDC in the Series 23, Number 23 report mentioned above or contact firstname.lastname@example.org. For more information about using the RDC,visit http://www.cdc.gov/nchs/r&d/rdc.htm.
October 15, 2008