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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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Using data from the national survey of family growth nsfg l.jpg

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

Joyce Abma, Ph.D.

Anjani Chandra, Ph.D.

Stephanie Willson, Ph.D.


Overview l.jpg

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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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


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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


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Children Ever Born, by Woman’s Education, 1995

Source: Abma et al, 1997, Table 4


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Pregnancy, Live Birth, Induced Abortion & Fetal Loss Rates, 1990 & 1995

Rate per 1,000 Women

1995

1990

Source: Ventura et al, 2000


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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


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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


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NSFG sample (Cycles 1-5)

  • Nationally representative sample of women

  • Civilian non-institutionalized population of women 15-44

  • Probability sample

  • Multistage, stratified, cluster design


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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


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NSFG Cycles 1-5

Cycle

Year

N

Women 15-44

119739,797Ever-married

219768,611 Ever-married

319827,969All

419888,450All

4 (Tel)19905,686Reintv of ‘88

& new teens

5199510,847All


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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


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Summary of

Questionnaire Content

in 1995 NSFG

and Selected Findings


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Section A

  • Education history

  • Childhood & young adult living arrangements

  • Work history

  • Smoking


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Father Figure During Adolescence: U.S. women 15-44 in 1995

Percent

Type of Father Figure:

Source: Peterson, poster presented at PAA 1998


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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


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Payment for Delivery for Women’s Most Recent Birth, 1991-5

Mother’s Age at Delivery

Source: Abma et al, 1997, Table 69


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Percent Breastfed among Babies Born 1990-1993

Percent

Wantedness of Pregnancy at Conception

Source: Abma et al, 1997, Table 57


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Section C

  • Marriage history

  • Cohabitation history

  • First intercourse; first partner

  • Partner history (last 5 years)


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Percent Likelihood that 1st Marriage Dissolves Within Ten Years

Percent

Age at marriage

Source: Bramlett & Mosher, forthcoming in Series 23, #22


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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


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Section D

  • Current menstrual status

  • Sterilization operations: type, date, reasons, reversals

  • Impaired fecundity

    • Nonsurgical sterility

    • Subfecundity


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Source: Chandra et al, poster presented at PAA 2002


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Impaired Fecundity vs. 12 month Infertility among Married Women 15-44: U.S., 1982-1995

Percent

Source: Chandra & Stephen, 1998


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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


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Type of Contraceptive Used Among Women 15-44 Who Currently Use Contraception: U.S., 1995

Method:

Source: Piccinino & Mosher, 1998


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Percent of Women 15-29 Currently Using Condom

Percent

Age in years

Source: Piccinino & Mosher, 1998


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Percent of Births 1991-95 Unwanted by Mother at Time of Conception

Percent

Source: Abma et al, 1997, Table 15


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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


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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


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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


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Section H

  • Infertility services

  • Pelvic Inflammatory Disease

  • Sexually transmitted infections

  • Other reproductive health-related conditions & behaviors

  • HIV testing


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Percent of Women 15-44 Ever Treated for PID

Percent

Age at first sex

Source: Abma et al, 1997, Table 89


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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


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Percent Uninsured Among Women 15-44

Percent

Source: 1995 National Survey of Family Growth


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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


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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


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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


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1995 NSFG data files available

  • Public Use Files

    • Respondent file

    • Pregnancy (interval) file

  • Omitted Items File

  • Fieldwork File

  • Contextual Data Files


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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


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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


Nsfg public use data files l.jpg

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


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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)


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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.


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NCHS Research Data Center

  • Contextual data files

  • State level indicators (user-supplied)

  • NHIS linked analyses (1988 & 1995)

    RDC Contact: Kenneth Harris

    Email:[email protected]


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NSFG - limitations

  • Limited ability to make reliable sub-national estimates

  • Health information not verified

  • Complex to analyze


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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


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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


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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


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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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Interview Experiment(Conducted in Pretest, repeated in Main Study)

ExperimentResultsDecisionFor MainStudy

Question format forMore men report use Repeatmethod use at last sex with separate question experimentformat experiment(preserve timethan with combined formatseries, allowmale-femalecomparability


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Key Design Information Learned from Cycle 6 Pretest

  • Pretest instruments were too long

  • Difficult for interviewers to learn both female and male protocols

  • Training staff needs more time to prepare; need adherence to schedule

  • Interviewer hours per interview too high

  • Interviewer attrition rates costly


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Between Pretest & Main Study...

  • Cut the questionnaires considerably

  • Improved interviewer recruitment & retention

  • Screening & Interviewing Procedures

  • Offered $40 token of appreciation to respondents


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Changes in Interview Lengthbtw/Cycle 6 Pretest and Main Study

Instrument Goal Actual

Male (Pretest) 60 91

Female (Pretest) 80126

Male (July estimate) 60 59

Female (July estimate) 80 86


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Male NSFG will shed light on:

  • Father involvement & activities

    • Coresidential kids <= 18 yrs

    • Noncoresidential biolog/adoptv kids <=18 yrs

  • Child support

  • Male reporting of pregnancies/births

  • Male reporting of sexual partnerships

  • Male contraceptive behavior

  • Male role in unintended pregnancy

  • Male infertility

  • STD/HIV risk & transmission


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Female NSFG in Cycle 6

  • All core topics maintained from Cycle 5

  • Expanded Audio CASI

  • Streamlined event histories

  • Other selected enhancements based on questionnaire design research


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Let’s look at the handout…

Overview of 1995 NSFG

1995 data files: content & ordering information

One-page outlines of Cycle 6 female & male questionnaires


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