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Joyce Abma, Anjani Chandra, Gladys Martinez National Center for Health Statistics

The National Survey of Family Growth. Joyce Abma, Anjani Chandra, Gladys Martinez National Center for Health Statistics. National Center for Health Statistics Data Users Conference Washington, DC July 2006. National Survey of Family Growth (NSFG) Team at NCHS. Joyce Abma Anjani Chandra

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Joyce Abma, Anjani Chandra, Gladys Martinez National Center for Health Statistics

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  1. The National Survey of Family Growth Joyce Abma, Anjani Chandra, Gladys Martinez National Center for Health Statistics National Center for Health Statistics Data Users Conference Washington, DC July 2006

  2. National Survey of Family Growth (NSFG) Team at NCHS Joyce Abma Anjani Chandra Jo Jones Gladys Martinez Brittany McGill William Mosher (Team Leader) Stephanie Ventura (Branch Chief)

  3. Overview of presentation • Background of NSFG, with focus on Cycle 6 (2002) survey • Selected data highlights to illustrate analytic potential • Nuts & bolts of data and documentation • Glimpse into Cycle 7 (now in the field)

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

  5. Collect periodic data on the “intermediate variables” “Snapshot” of U.S. fertility, family formation, and reproductive health Complement vital statistics and fulfill Section 306 of PHS Act Track national health objectives (e.g. Healthy People 2010) Evaluate health and social policies Research: demographic and public health Uses of NSFG Data

  6. NSFG Funders • CDC’s National Center for Health Statistics • National Institute for Child Health & Human Development (NICHD/NIH) • Office of Population Affairs (OPA) • CDC’s National Center for HIV, STD, and TB Prevention (DHAP & DSTDP) • CDC’s Division of Reproductive Health • CDC’s Office of Women’s Health • Office of the Assistant Secretary for Planning & Evaluation (OASPE) • Children’s Bureau, Administration for Children and Families (ACF) • Office of Planning, Research and Evaluation, ACF

  7. NSFG history in brief

  8. How the Cycle 6 (2002) NSFG data were collected • Contractor: Institute for Social Research (ISR), University of Michigan • In-person interviews using laptop computers • ACASI component for about 20 minutes • Interviews conducted in both English and Spanish • Informed consent procedures • Signed consent for adults (18-44) • Signed assent and signed parental consent for minors (15-17 years of age)

  9. Sample design for Cycle 6 • Nationally representative sample of men and women • Selected from 120 PSUs • Oversampled Blacks, Hispanics, and 15-24 year olds

  10. Cycle 6 response rates Overall response rate = 79% Hispanic (overall) = 81% Non-Hispanic Black (overall) = 82% All other (overall) = 77%

  11. Cycle 6 Sample size by subgroup

  12. NSFG - sample weights Adjust for: • Oversampling • Screener non-response • Interview non-response • Post-stratification to Census Bureau totals (age, race & ethnicity, marital status, sex) ____________________________________ USE WEIGHTED DATA to make valid national estimates.

  13. Cycle 6 (2002) NSFG - variance estimation • Complex sample design must be accounted for to make accurate inferences • Requirements for accurate estimation • Fully adjusted weight (FINALWGT) • Collapsed strata variable (SEST) • Panel identifier (SECU_R or SECU_P for female respondent & pregnancy files; SECU for male file) For reference and further details: Series 2 report (forthcoming)

  14. Female Questionnaire • Age, race, education, family & parental background B. Pregnancy history & adoption • Marital & cohabitation history; first partner; sex education; sexual partner history for last 12 months • Sterilization operations; fecundity impairments • Contraceptive history; all methods ever used, first method used, used in last 3 years, partner specific use, consistency of condom use; wantedness of births (old & new measures)

  15. Female Questionnaire (cont’d) • Use of medical services for birth control & for general health • Desires & intentions for future children • Infertility services; reproductive health conditions; HIV testing • Health insurance; religion; work; child care; attitudes on sex, parenthood & marriage J. Audio Computer-Assisted Self-Interview

  16. Male Questionnaire • Age, race, education, family & parental background; numbers of wives & cohabiting partners • Ever had sex; sex education; ever had a child; number of partners in lifetime and last 12 months; vasectomy; infertility; dates of 3 most recent partners in last 12 months or last sex ever • Current wife or cohabiting partner: characteristics; children with her; contraceptive use • 3 most recent partners in last 12 months; children with them; contraceptive use; first sexual partner ever • Former wives and first cohabiting partner; children with them; contraceptive use

  17. Male Questionnaire (cont’d) • Other births and pregnancies fathered: characteristics of their mothers • Activities with biological and adopted children respondent lives with, and does not live with • Desires and intentions for future children • Health insurance; health conditions; use of family planning, infertility, and other health care services; HIV testing • Religion; military service; work; attitudes on sex, marriage, parenthood • Audio Computer-Assisted Self-Interview

  18. Types of Variables provided on the data files • “Raw”: most variables. Usually not edited. Not imputed. May have some missing data. • “Blaise-computed”: defined in instrument during interview to help with routing, etc • “Recode”: Best to use recodes if available. • Specs provided in User’s Guide. All missing cases imputed (expected value generated by multiple regression). • Raw variable and a recode could have some inconsistent cases because recode is edited and imputed. • Imputation flags indicate whether & how imputation was done

  19. Types of data collected in Audio CASI • Height and weight • Pregnancies had or fathered • Alcohol, smoking (females only), and drug use in last 12 months • Vaginal, oral, and anal sex with opposite-sex partners • Same-sex sexual experience (greater detail for males) • Non-voluntary sex (18-44 only) • HIV/STI risk behaviors • Sexual orientation and attraction • STI history • Income and public assistance received

  20. Definition of Sex in CAPI vs. ACASI • Cycle 5, ACASI same definition as CAPI: • Heterosexual vaginal intercourse Sex  Babies • New in Cycle 6, ACASI asks about: • Opposite sex and same sex partners • All types of sexual activities (vaginal, oral & anal) Sex  risks for STDs and HIV

  21. Risk Measures for STI/HIV – Cycle 6 (2002) NSFG Focus on behaviors in last year Drug-related risk: • Injection of illicit drugs • Use of marijuana, cocaine, crack cocaine Sex-related risk: • If male: sexual contact with other males;If female: sex with men who have had sex with men • Sex with an HIV-positive partner • Sex with an IV drug user • Number of sexual partners in last year • Exchange of sex for drugs or money • Testing or treatment for sexually transmitted infection

  22. Cycle 6 (2002) NSFG data files • Public use files • Female respondent file • Female pregnancy file • Male respondent file • ACASI files • Female ACASI • Male ACASI • Contextual files (through NCHS RDC) • Interviewer Observations (circumstances surrounding interview)

  23. Percent of women aged 22-44 who are childless and percent who have 3 or more children ever born, by education: US, 2002 Percent childless Percent with 3 or more children Highest education attained Female respondent file

  24. Percent of males who have ever fathered a child, by age: US, 2002 Percent Male file

  25. Percentage of fathers 15-44 years of age who did the specified activity every day in the last 4 weeks with their children under 5 years old, by whether or not they lived with their children: United States, 2002 Male file

  26. Percent sexually experienced, by age: never-married teens 1995 and 2002 Females Males Female respondent & Male files

  27. Pregnancy rates for teenagers by age: US, 1976-2000 Pregnancies per thousand 149 18-19 years 130 101 15-19 years 85 15-17 years 69 54 Trend analysis based on NSFG, natality, and AGI data

  28. Percentage of men and women 15-44 years of age who agree or strongly agree with the statement, “It is all right for unmarried 18 year olds / 16 year olds to have sexual relations if they have strong affection for each other”: United States, 2002 Male file and female respondent file

  29. Percent of males and females 18-24 who had their first intercourse before age 20 by how much they wanted it to happen when it did: US, 2002 Percent Percent ACASI file

  30. Percentage of men 22-44 years of age who have ever cohabited or are currently cohabiting, by education: United States, 2002 Male file

  31. Probability of first marriage for men and women 15-44 years of age, by age : United States, 2002 Female respondent & male files

  32. Percent of women who used a method of contraception at their first premarital intercourse, by year of first intercourse: US, 2002. Percent Year of first intercourse Female respondent file

  33. Current Contraceptive Users by Method Percent 1995 2002 Other Male Condom Injectable (Depo) Calendar Rhythm & NFP Implant, Patch, Lunelle Withdrawal IUD/ Diaphram Female Sterilization Male Sterilization OC Pill Female respondent file

  34. Percent of women 22-44 years of age who are currently using a specified method of contraception, by education: US, 2002 Percent Female Sterilization Pill Female respondent file

  35. Percent distribution of births in the last 5 years to men and women 15-44 years of age, by wantedness of the child at the time of conception: United States, 2002 Female pregnancy file and Male file

  36. Percent distribution of first births to women 15-44 years of age at interview by marital and cohabiting status of mother at first birth, according to Hispanic origin and race: United States, 2002 Female respondent file or pregnancy file

  37. Percent of women who smoked during their most recent pregnancy ending in 1997-2002: US, 2002 Pregnancy outcome Wantedness at time of conception Female pregnancy file

  38. Percent of women who paid for their most recent live birth delivery (1997-2002) with Medicaid or government assistance Age at birth Marital status at birth Female pregnancy file

  39. Percent of babies breastfed at all: single births 1990-93 and 1997-2000 Female pregnancy file

  40. Use of Family Planning or Medical Services in Past Year: US, 2002 Percent Female respondent file

  41. Percent of women 15-44 who received 1 or more family planning services from a medical care provider in the last 12 months, by age: US, 2002 Percent Age at Interview Female respondent file

  42. Males who have ever gone to a family planning clinic with a female partner: US, 2002 Percent Total 15-24 years 22-24 years 15-17 years 20-21 years 18-19 years Note: Data are for unmarried males who reported ever having sexual intercourse. Male file

  43. Impaired fecundity compared with 12 month infertility among married women 15-44: US, 1982-2002 Percent Trend analysis using female respondent files

  44. Percent Distribution of Childless Women aged 35 - 44, by Childless Status: 1982, 1988, 1995, and 2002 Trend analysis using female respondent files

  45. Percent of males and females 25-44 years of age who have had each type of sexual contact: US, 2002 ACASI file

  46. Percent tested for HIV in last year, by risk status and sex: US, 2002 Percent Any risk=Drug-related, sex-related, recent STI testing or treatment ACASI file

  47. Obtaining public-use data files from Cycle 6 Available Free on CD-ROM or download from webpage

  48. Obtaining ACASI files for Cycle 6 • The ACASI file data and documentation are available upon request and without charge. • Provide a brief summary, on your organization’s letterhead, of how you propose to use the data. • Submit a signed User Agreement • Available on the NSFG website • All users must sign the agreement • A CD-ROM will be sent to you. • Omitted items files for Cycles 4 and 5 are also available

  49. Cycle 6 (2002) Contextual data files (RDC) • Use remotely or in NCHS RDC - application required (available on website) - charges vary • Community characteristics • 4 levels (county, census tract, block group) • 2 points in time (2000, 2002) • Linkage to over 1000 contextual variables • Variable list is available on the website • State of residence – only available through RDC, but enables linkage to user-provided state-based indicators

  50. NSFG website SAS program statements Public-use data files

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