National Survey of Family Growth - Wave 7 (2006-2008) Pregnancy File

Data Archive > U.S. Surveys > General Population > National > National Survey of Family Growth > Summary


These surveys were based on personal interviews completed with 4,524 respondents. The main purpose of the NSFG surveys have been to provide reliable national data on marriage, divorce, contraception, infertility, and the health of women and infants in the United States. The survey contains key religion variables that may relate to these goals. Cycle 7 utilized continuous interviewing, in which interviewers gather data on a year round basis, with data exported every few years. This is the first data export from cycle 7.

The pregnancy file uses each pregnancy mentioned by a respondent as the unit of analysis and contains detailed pregnancy histories and wantedness of pregnancies, as well as selected respondent characteristics.

Using the common identification number (CASEID), and the pregnancy number (PREGORDR), the interval and respondent files can be merged to produce a file containing both respondent information and pregnancy information. The resulting file can be either respondent-based (up to 4,524 records) or interval-based (up to 12,221 records). The ARDA used the interval-based format for the data set.

Data File
Cases: 12,221
Variables: 238
Weight Variable: FNLWGT30, FNLWGT18
These are both post-stratification weights.
Data Collection
Date Collected: June 2006 - December 2008
Funded By
National Center for Health Statistics (NCHS)
Collection Procedures
Inteviews were conducted In-person by female University of Michigan interviewers using CAPI and ACASI techniques via laptops.
Sampling Procedures
This sample is a national area, probability sample of households. The NSFG cycle 7 includes oversamples for teenagers, Hispanic men and women, and non-Hispanic Black men and women. See the related methodological publications listed below, under the ARDA's related publcations section, for more information.
Principal Investigators
National Center for Health Statistics (NCHS)
Related Publications
NSFG Cycle 7 User's Guide: http://www.cdc.gov/NCHS/data/nsfg/NSFG_2006-08_UserGuide_MainText.pdf

Full list of related publications: http://www.cdc.gov/nchs/nsfg/nsfg_products.htm

Methodological publications:

Groves RM, Mosher WD, Lepkowski J, Kirgis NG. (2009) Planning and development of the continuous National Survey of Family Growth. National Center for Health Statistics. Vital Health Stat 1(48).
Full text available at: http://www.cdc.gov/nchs/data/series/sr_01/sr01_048.pdf

Lepkowski JM, Mosher WD, Davis KE, Groves RM, Van Hoewyk J. (2010) The 2006–2010 National Survey of Family Growth: Sample design and analysis of a continuous survey. National Center for Health Statistics. Vital Health Stat 2(150). .
Full text available at: http://www.cdc.gov/nchs/data/series/sr_02/sr02_150.pdf

"Appendix 5: Summary of NSFG Questionnaire Changes - Years 1, 2, and 3 of Continuous NSFG".From:2006-2008 NSFG User's Guide.http://www.cdc.gov/NCHS/data/nsfg/NSFG_2006-08_UG_App5_QuexChanges.pdf
Note 1
For the variables CSECPRIM, CSECMED1, CSECMED2, CSECMED3, CSECMED4, WHYNOUS1, WHYNOUS2, WHYNOUS3, WHYNOUS4, WHYNOUS5, and MAINOUS:

The question or possible response category wording on these variables changed over the course of this survey. For more information, please see: "Appendix 5: Summary of NSFG Questionnaire Changes - Years 1, 2, and 3 of Continuous NSFG".From:2006-2008 NSFG User's Guide.http://www.cdc.gov/nchs/nsfg/nsfg_2006_2010_puf.htm
Note 2
For the variables: KNEWPREG, PRIORSMK, POSTSMKS, GETPRENA, WORKPREG, FMAROUT5, PMARPREG, RMAROUT6, and LIVCHILD: these were applicable only if the pregnancy was completed.

For the variables LEARNPRG, PNCARWK, BIRTHPLC, PAYBRTH1, PAYBRTH2, PAYBRTH3, and PAYBRTH4: these variables were applicable only if the pregnancy was completed and miscarriage was not induced.
Note 3
For the variable, RESNOUSE, there were three possible prompts according to different situations:

1. If the respondent had not used a method: Before you became pregnant (with your (NTH) pregnancy which ended in (DATE/this time), was the reason you did not use any birth control methods because you, yourself, wanted to become pregnant?

2. If the respondent had used a method between her first time having sex/last pregnancy and the pregnancy this (nth) pregnancy: You told me you had stopped using a birth control method before you became pregnant (with your (NTH) pregnancy which ended in (DATE)/this time). Was the reason you had stopped using any methods because you yourself wanted to become pregnant?

3. If the respondent had not used a method between her first time having sex/last pregnancy and the pregnancy this (nth) pregnancy: You did not use any method of birth control from (your first intercourse/[BABY NAME’s] birth in [DATE]/your [Nth] pregnancy which ended in [DATE]) until you became pregnant (with your (NTH) pregnancy which ended in (DATE)/this time).
Note 4
For the variables COHPBEG and COHPEND:

These variables were applicable only if the respondent is not currently pregnant, and not currently married, married more than once, times married unknown, the pregnancy began before marriage, date married is unknown, or date pregnancy ended is unknown.
Note 5
For the variables WHYPREG1 and WHYPREG2:

These variables were applicable only if the pregnancy ended on or after January [YEAR OF INTERVIEW -3] or the pregnancy is current, and the respondent reported that she either became pregnant too soon, had not wanted any future children before getting pregnant, probably did not want a(nother) baby at some time in the future or resposnded "no" to the second time she was asked, whether, right before this pregnancy, she wanted to have a baby at any time in the future, and had used a method in the month the pregnancy began.

For the variables WHYNOUS1, WHYNOUS2, WHYNOUS3, WHYNOUS4, WHYNOUS5, and MAINOUS:

These variables were asked for the same condition as those listed above except that the respondent had not used a method in the month the pregnancy began.