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Using Data from the National Survey of Family Growth (NSFG)

Using Data from the National Survey of Family Growth (NSFG). Joyce Abma, Ph.D. Anjani Chandra, Ph.D. Stephanie Willson, Ph.D. Overview. Purpose and uses Sample design & methodology Questionnaire content. Selected findings from 1995 Using the Cycle 5 (1995) data Cycle 6 and beyond.

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Using Data from the National Survey of Family Growth (NSFG)

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  1. Using Data from the National Survey of Family Growth (NSFG) Joyce Abma, Ph.D. Anjani Chandra, Ph.D. Stephanie Willson, Ph.D.

  2. Overview • Purpose and uses • Sample design & methodology • Questionnaire content • Selected findings from 1995 • Using the Cycle 5 (1995) data • Cycle 6 and beyond

  3. Intermediate variables Intercourse variables: • Timing of first intercourse • Percent of women who • ever had intercourse • Time spent in marriage • (separation, divorce) • Frequency of intercourse Social factors • Race/ethnicity • Religion • Labor force • participation • Education • Income • Access to • health care • Family • background • Community • environment • (economic, • social, etc.) Conception variables: Fertility (live births) • Contraceptive use • Sterilization • Infertility Pregnancy outcome (gestation) variables: • Miscarriage and • stillbirth • Induced abortion

  4. Uses of NSFG data • Collect periodic data on the “intermediate variables” • “Snapshot” of U.S. fertility, family formation, and reproductive health • Complement vital statistics • Track national health objectives • Evaluate health & social policies • Research: demographic and public health

  5. Children Ever Born, by Woman’s Education, 1995 Source: Abma et al, 1997, Table 4

  6. Pregnancy, Live Birth, Induced Abortion & Fetal Loss Rates, 1990 & 1995 Rate per 1,000 Women 1995 1990 Source: Ventura et al, 2000

  7. Percent of Women 18-29 Who Had a Birth Before 18 Percent Median Family Income at Block Level Source: 1995 National Survey of Family Growth, Contextual Data Files

  8. Percent Living with Father at Time of Most Recent Delivery Percent Mother’s Age at Delivery Wantedness at Conception Source: Chandra, poster presented at PAA 1998

  9. NSFG sample (Cycles 1-5) • Nationally representative sample of women • Civilian non-institutionalized population of women 15-44 • Probability sample • Multistage, stratified, cluster design

  10. NSFG sample (Cycles 1-5) • Oversample black women and starting in 1995, Hispanic women • Never-married women included starting in 1982 (Cycle 3) • 1988 & 1995 (Cycles 4-5) based on NHIS sample

  11. NSFG Cycles 1-5 Cycle Year N Women 15-44 1 19739,797Ever-married 219768,611 Ever-married 319827,969All 419888,450All 4 (Tel)19905,686Reintv of ‘88 & new teens 5199510,847All

  12. Innovations in 1995 NSFG, Cycle 5 • Major changes in questionnaire content and format • Changed mode of data collection to CAPI and Audio CASI • $20 token of appreciation paid to respondents -- maintain response rates with longer, more sensitive interview

  13. Summary of Questionnaire Content in 1995 NSFG and Selected Findings

  14. Section A • Education history • Childhood & young adult living arrangements • Work history • Smoking

  15. Father Figure During Adolescence: U.S. women 15-44 in 1995 Percent Type of Father Figure: Source: Peterson, poster presented at PAA 1998

  16. Section B Pregnancy history, including: • Date, outcome, gestational length of each • Smoking in each recent pregnancy • Prenatal care for each recent pregnancy • All births: birth weight, payment for delivery, breastfeeding, maternity leave Adoption, stepchildren, foster children

  17. Payment for Delivery for Women’s Most Recent Birth, 1991-5 Mother’s Age at Delivery Source: Abma et al, 1997, Table 69

  18. Percent Breastfed among Babies Born 1990-1993 Percent Wantedness of Pregnancy at Conception Source: Abma et al, 1997, Table 57

  19. Section C • Marriage history • Cohabitation history • First intercourse; first partner • Partner history (last 5 years)

  20. Percent Likelihood that 1st Marriage Dissolves Within Ten Years Percent Age at marriage Source: Bramlett & Mosher, forthcoming in Series 23, #22

  21. Cumulative percent of females aged 15-19 who have had sex before reaching selected ages, 1988 and 1995 Percent 77 70 19 11 1 3 Age in years Source: Abma and Sonenstein, 2000

  22. Section D • Current menstrual status • Sterilization operations: type, date, reasons, reversals • Impaired fecundity • Nonsurgical sterility • Subfecundity

  23. Source: Chandra et al, poster presented at PAA 2002

  24. Impaired Fecundity vs. 12 month Infertility among Married Women 15-44: U.S., 1982-1995 Percent Source: Chandra & Stephen, 1998

  25. Section E Contraceptive history • Ever used • First used • Month-by-month method calendar for last 5 years • Consistency of recent use • Method use at last (recent) sex Wantedness status of each pregnancy • Wanted / mistimed / unwanted • Ambivalence measure

  26. Type of Contraceptive Used Among Women 15-44 Who Currently Use Contraception: U.S., 1995 Method: Source: Piccinino & Mosher, 1998

  27. Percent of Women 15-29 Currently Using Condom Percent Age in years Source: Piccinino & Mosher, 1998

  28. Percent of Births 1991-95 Unwanted by Mother at Time of Conception Percent Source: Abma et al, 1997, Table 15

  29. Sections F & G • Family planning services • Other medical services • Focus on use of Title X Clinics • Focus on last 12 months • Birth expectations in future

  30. Use of Family Planning or Medical Services in Past Year Among Women 15-44: U.S., 1995 Percent Source: Abma et al, 1997, Table 74

  31. Ever-Married Childless Women Age 35-44: Childbearing Expectations and Fecundity 1988 1995 1982 (Expect 1 or more) (Expect 0, fecund) (Expect 0, impaired fecundity) Source: Abma & Martinez, Paper Presented at PAA, 2002

  32. Section H • Infertility services • Pelvic Inflammatory Disease • Sexually transmitted infections • Other reproductive health-related conditions & behaviors • HIV testing

  33. Percent of Women 15-44 Ever Treated for PID Percent Age at first sex Source: Abma et al, 1997, Table 89

  34. Section I • Residence (current, 1990, at birth) • Religion – affiliation, attendance • Race and Hispanic origin • Attitudes toward family and gender roles • Occupation & income • Health insurance coverage • Child care

  35. Percent Uninsured Among Women 15-44 Percent Source: 1995 National Survey of Family Growth

  36. Section J (Audio CASI) • Abortion re-reporting • Forced sexual intercourse • Family violence (teens only) • Numbers of sexual partners (re-reported) • Other sensitive items related to sexual behavior & STD/HIV risk

  37. Percent of Unmarried Women Reporting 4 or More Male Sexual Partners in Past Year, Interviewer versus Self-administered mode Percent Source: Abma et al, 1997, Table 27

  38. Using the 1995 NSFG • Several data files available • Common CASEID allows linkage of information across files • Access procedures vary due to confidentiality and sensitivity of data • Summary of all files and access procedures in your handout

  39. 1995 NSFG data files available • Public Use Files • Respondent file • Pregnancy (interval) file • Omitted Items File • Fieldwork File • Contextual Data Files

  40. 1995 NSFG - sample weights Adjust for: • Differential probability of selection • Location rates • Nonresponse rates • Post-stratification (age, race, marital status, parity); noncoverage Further details: Consult Series 2, #124

  41. 1995 NSFG - variance estimation • Complex sample design must be accounted for to make accurate inferences • Requirements for accurate estimation • Fully adjusted weight (POST_WT) • Collapsed strata variable (COL_STR) • Panel identifier (PANEL) For reference and further details: Series 2, #124

  42. NSFG Public Use Data Files • Available on cartridge tape • Cycles 1, 2, 4, 5 available on CD-ROM (3 soon) • 1995: extensive documentation (also on web) • User’s Guide • Codebook • CAPI Reference Questionnaire

  43. 1995 NSFG - Contextual data files • Restricted use • Several access options, including NCHS RDC • Community characteristics • 4 levels of aggregation (state, county, census tract, block group) • 3 points in time (1990, 1993, 1995)

  44. 1995 NSFG - Contextual data files • 10,847 woman-records with linkage to over 1000 contextual variables including geocoding variables. • Access restricted due to confidentiality & disclosure concerns. • Rich potential for descriptive as well as detailed multilevel analyses.

  45. NCHS Research Data Center • Contextual data files • State level indicators (user-supplied) • NHIS linked analyses (1988 & 1995) RDC Contact: Kenneth Harris Email: rdca@cdc.gov

  46. NSFG - limitations • Limited ability to make reliable sub-national estimates • Health information not verified • Complex to analyze

  47. NFSG - strengths • Large, representative sample • High response rates and low item nonresponse • Broad range of data spanning proximate and more distal factors affecting fertility • Analytic depth • Event history data • Contextual data

  48. Cycle 6 and beyond • Shorter intervals between Cycles • Cycle 6 in 2002 • Cycle 7 in 2005 • Sample independent from NHIS • Contextual data • Inclusion of males 15-44 • Other design options possible

  49. Inclusion of males 15-44 • Other half of fertility and family formation equation • 1996 Welfare Reform Act • Fatherhood Initiative (federal interagency effort) • Information collected directly

  50. Cycle 6 Pretest • March-August 2001 • About 600 completed interviews • Females 15-44; Males 15-44 • 4 primary areas: 3 MSAs; 1 rural area

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