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... thepopulation.Thenumberofwomen
sherepresentsinthepopulationiscalled
hersamplingweight.Sampling
weightsmayvaryconsiderablyfromthis
averagevaluedependingonthe
respondentsrace,theresponseratefor
similarwomen,andotherfactors.As
withanysamplesurvey,theestimatesin
thisreportaresubjecttosampling
variability.SignicancetestsonNSFG
datashouldbedonetakingthesampling
designintoaccount.
Nonsamplingerrorswereminimized
bystringentquality-controlprocedures
thatincludedthoroughinterviewer
training,checkingtheconsistencyof
answersduringandaftertheinterview,
imputingmissingdata,andadjustingthe
samplingweightsfornonresponseand
undercoveragetomatchnationaltotals.
Estimatesofsamplingerrorsandother
statisticalaspectsofthesurveyare
describedinmoredetailinanother
separatereport(13).
Thisreportshowsndingsby
characteristicsofthewomaninterviewed,
includingherage,maritalstatus,
education,parity,householdincome
dividedbythepovertylevel,andraceand
Hispanicorigin.Ithasbeenshownthat
blackandHispanicwomenhavemarkedly
lowerlevelsofincome,education,and
accesstohealthcareandhealthinsurance,
thanwhitewomen(14).Theseandother
factors,ratherthanraceororiginperse,
probablyaccountfordifferencesinthe
behaviorsandoutcomesstudiedinthis
reportamongwhite,black,andHispanic
women(15).
TableBshowsafactorthatshould
beconsideredininterpretingtrendsin
pregnancy-relatedbehaviorintheUnited
States:thechangingagecompositionof
thereproductive-agepopulation.In
1982,therewere54.1millionwomenof
reproductiveageintheUnitedStates;in
1988,57.9million;andin1995,60.2
million(16).Thelargebabyboom
cohort,bornbetween1946and1964,
was1834yearsofagein1982,2442
yearsofagein1988,and3149years
ofagein1995.Theselargebirthcohorts
werepreceded(upto1945)and
followed(196580)bysmallercohorts.
Whiletheoverallnumberofwomen
1544yearsofageroseby6million,or
11percentbetween1982and1995 ,the
numberofteenagewomendroppedby
about6percent,thenumberofwomen
2024yearsofagedroppedby
15percent,andthenumberofwomen
2529droppedby6percent(tableB).In
contrast,thenumberofwomen3044
yearsofageincreasedsharplyfor
example,thenumberofwomen4044
yearsofageincreasedby59percent
between1982and1995.Also,women
3044yearsofageaccountedfor
54percentofwomen1544yearsofage
in1995comparedwith44percentin
1982.Thesedifferencesinage
compositionmayberelevantwhenever
timetrendsamongwomen1544years
ofagearebeingdiscussed.
Publicuselesbasedonthe1995
NSFGareavailableoncomputertape.
TheywillalsobeavailableonCompact
DiscRead-OnlyMemory(CD-ROM).
Questionsaboutthecostandavailability
ofthecomputertapesshouldbedirected
totheNationalTechnicalInformation
Service(NTIS),5285PortRoyalRoad,
Springeld,VA22161,703487-4650,
or1800-553-NTIS.Questionsregarding
theCD-ROMlesshouldbedirectedto
NCHSDataDisseminationBranchat
301436-8500.
Results
T
ables117containmeasuresof
pregnancyandbirthintheUnited
States.
ChildrenEverBornandTotal
BirthsExpected
In1995,women1544yearsof
ageintheUnitedStateshadhadan
averageof1.2birthsperwoman
(table1).Thiscompareswith1.2in
1988and1.3in1982(17).In1995,
women1544yearsofageexpectedto
nishtheirchildbearingwithan
averageof2.2childrenperwoman
(table1)comparedwith2.2in1988
and2.4in1982(17).
Theproportionwhoreportthatthey
haveneverbeenpregnantwasmarkedly
higherforcollegegraduatesthanfor
thosewhodidnotcompletehighschool
(table3).Thissamepatternbyeducation
isalsoseenwhendataforlivebirthsare
examined(tables45):about49percent
ofwomen2244yearsofagewhohad
graduatedfromcollegehadhadnolive
birthsasofthedateofinterview
comparedwithjust8percentofwomen
2244yearsofagewithoutahigh
schooldiploma(table4).Withinrace
andHispanicorigingroups,thepattern
wasthesame:collegegraduateshad
markedlyhigherpercentschildlessthan
womenwithlesseducation(table5).
Table6showsacomparison
betweenlivebirthsreportedinthe
NSFGandlivebirthsregisteredonbirth
certicatesintheyears199194.In
eachindividualcalendaryearandfor
thesumoftheyears199194 ,the
NSFGestimateofthenumberofbirths
isveryclosetothebirthcerticatetotal
anddiffersfromitbylessthanthe
NSFGssamplingerror.TheNSFG
estimateisalsoverycloseforwhite
women.TheNSFGestimateforblack
womenisslightlylower,andthe
estimateforotherracessomewhat
higherthanthebirthcerticatedata.A
discussionofthisdifferenceisgivenin
thedenitionofRaceandHispanic
originintheDenitionsofTerms.
Overall,andbycharacteristicsother
thanrace,however,table6showsthat
TableB.Numberofwomen,byage:UnitedStates,1982,1988,and1995
Ageơ ... nonvoluntaryintercourse.Onesetof
questionswasintheinterviewer-
administeredportionofthesurveyand
thesecondwasintheself-administered
portion(AudioCASI).Inthe
interviewer-administeredseries,they
wereaskedwhethertheirfirst
intercoursewas‘‘voluntaryornot
voluntary.’’Forabout8percentof
women15–44yearsofagewhohave
hadintercourse,theirfirstintercourse
wasnotvoluntary(table21).Forthose
whosefirstintercourseoccurredatage
15oryounger,thatfirstintercoursewas
nonvoluntaryfor16percentcompared
with7percentorlessforthosewhose
firstintercourseoccurredatage16or
older.Thepercentwhosefirst
intercoursewasnonvoluntaryisnearly
10percentamongwomenwhosefirst
intercoursewasbefore1975compared
withabout6percentamongwomenwho
firsthadintercourseinthe1990’s
(table21).
Intheself-administered(Audio
CASI)portionoftheinterview,women
wereaskedarelatedbutdifferent
question:whethertheyhadeverbeen
forcedbyamantohavesexual
intercourseagainsttheirwill.About
20percentofwomenreportedthatthey
hadbeenforcedbyamantohave
intercourseagainsttheirwillatsome
timeintheirlives(table22).Thus,
table21showsthatfor8percentof
women,theirfirstintercoursewas
nonvoluntary;table22showsthat
20percenthadhadnonvoluntary
intercourseatsometime—not
necessarilyatfirstintercourse.Table22
alsoshowsthat6percentofwomen
reportedthattheywereforcedtohave
intercoursebeforetheywere15and
another6percentbeforetheywere18.A
fairlyhighpercentofformerlymarried
(divorcedorseparated)women—about
35percent—reportedthattheyhadbeen
forcedtohaveintercourse.Thisfinding
deservesfurtherstudy.
FirstSexualPartner
Therehasbeenmuchpublic
discussionaboutthepartnersofsexually
activeteenagers.Table23profilesthe
ageofmalepartnersatwomen’sfirst
voluntaryintercourse.Abouttwo-thirds
(66percent)ofwomenwhohadtheir
firstvoluntaryintercoursebeforethey
were16hadfirstpartnerswhowere
under18yearsofage;21percenthad
firstpartners18–19yearsofage;
7percenthadfirstpartners20–22years
ofage,2percenthadfirstpartners
23–24yearsofage,and4percenthad
firstpartners25yearsofageorolder
(table23).
Only3percentofwomenhadtheir
firstintercoursewithamantheyjust
met.About3outof5women
(61percent)were‘‘goingsteady’’or
‘‘goingtogether’’withthemantheyhad
intercoursewiththefirsttime,andabout
1in5wereengagedormarriedtohim.
About12percentofallwomenwere
marriedwhentheyhadtheirfirst
intercourse.Amongwomen40–44years
ofage(bornin1951–55),23percent
weremarriedtotheirpartneratfirst
intercoursewhileabout2percentof
women15–19yearsofage(born
1971–75)weremarriedtotheirfirst
partner.Womenwholivedwithbothof
theirparentsthroughouttheirchildhood
weremorelikelythanotherwomento
havebeenmarriedtotheirpartnerat
firstintercourse(table24).
FirstIntercourseRelativeto
FirstMarriage
Amongever-marriedwomen15–44
yearsofage,82percenthadfirst
intercoursebeforetheyweremarried.
About69percentofthosefirstmarried
in1965–74hadtheirfirstintercourse
beforemarriagecomparedwith
89percentofthosefirstmarriedinthe
1990’s.Only2percentofthosefirst
marriedin1965–74hadtheirfirst
intercourse5yearsormorebefore
marriagecomparedwith56percentof
thosefirstmarriedinthe1990’s
(table25).
NumberofSexualPartners
Asmentionedpreviously,some
questionsonabortion,sexualpartners,
andforcedsexualintercoursewere
askedinboththeinterviewer-
administeredandtheself-administered
(AudioCASI)portionsoftheinterview.
Responsestosensitivequestionsappear
tohavebeenaffectedbythecomputer
self-administeredmodeofinterviewing.
Tables26–31showdataonthenumber
ofsexualpartnersinthelast1year,5
years,andlifetime,usingboththe
interviewer-administeredandself-
administeredmethods.Presentingdata
basedonbothmodesofinterviewing
allowstheexaminationofdifferencesin
reportingduetothemodeof
interviewing(table26versus27,
table28versus29,andtable30versus
31);andtheselectionoffindingsmost
appropriateforcomparisontoother
surveys.
About3percentofunmarried
womentoldtheinterviewerthatthey
hadhadfourormoremalesexual
partnersinthelast12months(table26),
comparedwith9percentreportingfour
ormorepartnersinAudioCASI
(table27).Asimilardisparitywasfound
whencomparingtheinterviewerresults
withAudioCASIresultsforthenumber
ofpartnerssinceJanuary1991(alittle
lessthan5years,onaverage).
Amongunmarriedwomen,14percent
toldtheinterviewertheyhadfouror
moremalesexualpartnerssinceJanuary
1991(table28)while18percent
reportedinAudioCASIthattheyhad
hadfourormorepartnersinthattime
(table29).
Thistopicdeservesmoredetailed
study,butitappearsthatusingthemore
privateinterviewtechniquegavea
higherandpresumablymorecomplete
estimateofthenumberofpartners
amongunmarriedwomen(8,11).
MarriageandCohabitation
Tables32–37show1995dataon
formalmarriageandunmarried
cohabitation.About38percentof
women15–44yearsofagehadnever
beenmarriedwheninterviewedin1995
(table32).Thepercentnevermarried
washigherineveryagegroupin1995
thanitwasin1982(24).Abouthalfof
women25–39yearsofagehavehadan
unmarriedcohabitationwithamanat
sometimeintheirlives;10to
11percentofwomenintheirtwenties
arecurrentlycohabitingwithaman
(table33).
About30percentofwomen25–39
yearsofagelivedwithaman
(cohabited)beforetheirfirstmarriage
(table34).Overone-half(57percent )of
Series23,No.19[Page5
... U.S.
Department of Health and Human
Services. These organizations, along
with leading researchers from outside
the government, helped to design the
survey. Further details on the planning
and operation of the...