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i ee er book, not from thg, however, cannot bersion for attribution. AIDS pnv al pamattiative The Second Decade e origincific forauthorit osed from XML files created from thding styles, and other typesetting-speprint version of this publication as the Heather G.Miller, Charles F.Turner, and Lincoln E.Moses, Editors been recompd breaks, heaease use the BECHOAMCVOMIMOISRMSAIIOTLTN, ES OOEN CO ITNAH LAE, I ADBNSE DHR AESSVTEAIOATRRISACTLHI C AAANNLDD S STCOHIECENIACLES ginal work has ne lengths, worally inserted. Pl NASTCIIOENNACLE SR AESNEDA ERDCUHC CAOTUIONNCIL the original; liccident n of e orien a ohe w digital representatie breaks are true to thic errors may have b egp naa file: This ng files. Pme typogr PDF esettind so ut this nal typned, a NATIONAL ACADEMY PRESS ogiai WASHINGTON, D.C. 1990 Aboriret ii ee er book, not from thg, however, cannot bersion for attribution. NNotfNhofaOaer St t aiTcicoopoIinnepCmanraElmocl : RpeA isrTteti,cseah taeeteheda er preb ecNrmsaohplaj yaCoetni cnPooctsnu reitaenb.hlscla esAit l 2,fic so1wa r0td hht1eheo m eCsse yuro e bmnopjfseeo tEmcritttn buowgetfiier nostrhe neaei srcAre ihrn veodgepsr,naoe awunrnt e nfdw,o fNtrarh sot.ehW ma eIpn i.trp shW rtseiopt avuceseotcehdui ai onnblfc ygc iM otltsomh enoedp,f iG eDctthioe.neCvne ecN.. reT2ans0tih ian4oeng1 nmd 8aB lewo mAiatrbchdae rdroesefg m oatfhryde pnv This report has been reviewed by a group other than the authors according to procedures al pamattiative aenpcperos,v tehde bNya ati oRneaplo Artc Radeevmieyw oCf oEmnmgiinteteeer icnogn, sainstdi nthge o Ifn msteitmutbee orsf oMf ethdeic Ninaet.ional Academy of Sci- e origincific forauthorit gscuiiesnhTceehd e as ncNdha otteliaocrnhsan elo nAlgocagagyde aednm idny t sooc fti heSnecitirief unicsc eea snf odisr e atnh pgeri ngiveeaentreeir,n anglo wrneepslerfoaarfrcieth,. ,sU deplefod-npic etarhtpeeed at uutoatht itonhrgei tfsyuo roctfihe etthyrae on cfch eda iorstfteirn- been recomposed from XML files created from thd breaks, heading styles, and other typesetting-speease use the print version of this publication as the geANieartstNmStiphneoneerlnoracasraasee gcacmliasoatetln uni tei iNs kcsda potogrutsss TTT inreeeaen napoaoeectdom hhhtrdnalsaovhcthit wheee llmodineaOety,d ao e nA Ari slNNI aetirun.n e oonaeTnisentccpidamatfel rsesind haat otsgtsrtbrpShAigi ddeiim tvneooryteoeercn eeuec i atnnnr n iiaicmmtocattb nteta agsnheieioso drnesllioyyti sde o gbne hnodcoRn A p amonoio Ceeef ow slrbed ca fifsefifecMoyhz s tyn .an rseSiSycaeen ei d ediomenoit dcacsagdnefhn df gmirivlioretmit eeeitcniehn Eiitnhrcnnp mhfsi s eyeAtn iitaicacr so cnhn nCuotgoede sco fieetignguaissfavv o nf nt m ,nirp dsweiuth bt tEeas1heahd,eeyneyee iamln8sere mtn mce rst ioop g6 ieaigsoic Ifty fnueli3bc n se tir nap,tsgidb wsh, eds hoci aetatc.elrtntmeahoeanceiirhsinribctea senhr ceueafto.oil nl giie a dlneitlCefffTA cseedrls ygg vh eeaa oilhtecm oot eas tepwiueorsaa fvssmbdap ma nrd nsimaIelMl gtrocueenid istreosganineemnn es eelhpento rmats tmted1sisehrysiv iltciz.toi9n dba ueea accohhaDf7g sentrtbhibf tna eenrn0 mt ibrlaynsseo . oime .ap re, bs anelFn. attFccrohstyeedhg uoitorhgeomrn ioesianft mcndayf t htnenuac N.aroe o seaeiknitwnlTe nsnia l u b ddorcN itPh itgtnoesh1atiaenser h.oa enet9rrtwi ae et aenDe n sN6tnistp ndi, ahoghts4 tr irahdsrlahen ne.i, ieti ,ad ni A a Rsin uAsnrtteotvc lh hee ncpog nanriicAseaeapdsreb ccaape r edeqaecceoNeldconsr elraourxuhAei ng atmdtodriatrm, otsirdhc Maepemineayi oaaegymnbetesn hdin .ne'orti eWcnsdyi laeecsafr othia t mpe ltseofeSfihatt y. uneiAod d wfriyct oIdrgtt u ghui tcSeeanpieeo ciecta rdai ovcrnhiaf so adgvasiNsoe tc tefEe laeigeinifep onasomusp nnge srtetnc tntonchgo eioo yoei.o ytleseiv nf a shninDnitr oce ndhofeoa1etafyrrudo eeflmel9 n.f rSnrmeb1-toicthdo6n auioe-tg-tshrf-- s orPl the National Academy of Sciences and the National Academy of Engineering in providing services ginal work hane lengths, wally inserted. taRPoduo mtbbhleieiTnrc tig h sHMoeteve w.raeWelrodtnhrh mkj ioSt eetiehnn raattvlr,ty ie tcp hbecreo.hy va pbiiurdobmetlhdia c Ant,h caaeann dbddea tvmshiiecsie e fss-oc carihe ntanhditi ritsmfh ivecao nIaln,un srmdet iseetpun wetgecia tnosiev fs eeMurlpiynep,dg ooi rcfct ioetnhmdee .mb NDyu aran.t iiFctoiorneansant.l r kTRa cPheters ef eCrsaosrom cauhn nt dhcC ieDol uUirs.n.Sci.l. the original; liccident LInitberranrayt ioofn Calo Sntgarnedsas rCd aBtaolookg NCuarmdb Neru m0-b3e0r9 9-004–257083-8X9, cloth n of e orien a International Standard Book Number 0-309-04287-9, paper ohe Copyright ©1990 by the National Academy of Sciences w digital representatie breaks are true to thic errors may have b PFSTirehricisnrottd neP ddPr iriPninntr iittnnihngteig, n U,Jg uMn, liDyate ye1d c91 eS99mt09ab3teesr o1f9 9A2merica egp naa file: This ng files. 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MCAoRmSHAmLLi tHte.BeE oCKnE RA, ISDchSo oRlS oetfas Petiausbrtlciicch aH al enSaldcthi et, hnUecn eiBvseerhsiatyv oiof rMailc,h Sigoacnial, and e original pacific formattiauthoritative TRHOOBMEUPRArnTeS iv vFJee..nBCrtsOOiiotARynUT ECoSSHft, u, P DdGeiinervnasid,ss yiuUolavnntaei von eSfi arcGshietoyno eol rfoa Clf IaEnlditfeuorcrnanatilia o Mnat e aSdnaidcn i nDFere,ap naancridtsm cCoeennt toefr Sfotar tAistIiDcsS, osed from XML files created from thding styles, and other typesetting-speprint version of this publication as the DSRJAROHAOOLHIBMBNRNEY LMWOCSD RNENHtCeTiYo eas n .. lnCstMDGtlRrhyeoLi.EACic. r.nnJIBDS,tGN OO gUNrNDARNtoJOEonWeTSoANNwnIEiENkRvBN, S ELaeA,Y,DSA tr U ,sIDoS*eMDSirtep, e,ky eSa ap,ptCur aDtataplrmhneretetemdpemrm ianeMnertintt nceomtoat nu lfeod n onfeStD ft n o SMetci oSpnoiefooeafd ncl iio ASidcSagacenlcylhn th ,hoc aoHyroSnoo iltdlsspa I t,oot onefSDlrs oyaMteUgin tcyuen ai,Fdtsni eviirdo,cGae ninrnrEsB caeitidteShsytuccih caoio est ef,nUI scNUnreCaisenfee,wii lnev tdCeeMY rarSs,orie cntrdyhCkei og ciootaiayeftll been recompd breaks, heaease use the JLAINNCEUCO MLenNniE vtENeeK.rrM,Es UiNOt ynS( EiVovSfie c(NrCes eihtCwyah i orYa)fi,o r PDr)ke, enDpnaesryptlamvratemnnitea onft Sotfa tSisotcicios,l oSgtyan, faonrdd UPonpivuelrastiitoyn Studies ginal work has ne lengths, worally inserted. 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Pme typogr CHARtShLoEecS Ai aFIl.,DT aSUnR dEN pSEiRtda, etDimsitiricceaclt oSrc, iCenocmesmittee on AIDS Research and the Behavioral, PDF esettind so ut this nal typned, a ogiai Aboriret * Served through September 1, 1989. iv ee er book, not from thg, however, cannot bersion for attribution. MPHAILRISPH AWLL.B HL.UPBMaESCnTKEeEIlNR , o (CnDh eAapiaIrr)Dt,m SSec nhItno ootlef orSfv oPecunibotlliioocg nHys,e aaUlntnhdi,v U eRrnseiivtsyee rasoirft ycW hofa Mshiicnhgitgoann at pnv al pamattiative MARSGeAaRtEtTle A.CHESNEY, Department of Epidemiology and Biostatistics, and e origincific forauthorit CFreanntceirs cfoor AIDS Prevention Studies, University of California at San osed from XML files created from thding styles, and other typesetting-speprint version of this publication as the AMRJJKAAENAINMENKREEDDEESaMMS S NY n AttAV aa LaedTLttddH. ..eeELUTS.iiF EYscPPHOUnoIUiNRNRssCninL yyvHE,KeL PcceNA,SI DhhLrOSIRaLsOEiiNnDiIiaaNVvAt,dTtty ,iEVrr, s MiiM,SIoHcc iNoHuf a,oIII n bCInVnrn VcDsssta thoett aCelii ffCittnpif euuoooceanAttfrenrree tetn dte,,mD eAiroCCMar eilb foomeanfeoullostdtruues c r Siesmm eCco C anafSbblBn ltliiiei niSaanCFrriM viotcrUUechaicaneac nnniltdleo Dciie aisvvalircno,eseen, i cfdgrrSndBeoss ye aciirBB,,ttnot yysee nU AhFhxFanral,abv oivNvneiuioeocrentrrirw dassacliaE l tY otySiSi no ottGsunuortkde,dfe niiieWenWess r,,ha i CNslNi tcoeHeeol wwlnoePss g lYYipaenii oo tnaorraslkkft,, been recompd breaks, heaease use the JCAoMnEsNSu eAlwt.aW nYtIosLrEkY, Survey Research Center, University of California at Berkeley s orPl ginal work hane lengths, wally inserted. 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Pl RONACLoDn tWro.lWILSON, National Center for Health Statistics, Centers for Disease the original; liccident n of e orien a ohe w digital representatie breaks are true to thic errors may have b egp naa file: This ng files. Pme typogr PDF esettind so ut this nal typned, a ogiai Aboriret vi ee er book, not from thg, however, cannot bersion for attribution. pnv al pamattiative e origincific forauthorit osed from XML files created from thding styles, and other typesetting-speprint version of this publication as the been recompd breaks, heaease use the s orPl ginal work hane lengths, wally inserted. the original; liccident n of e orien a ohe w digital representatie breaks are true to thic errors may have b egp naa file: This ng files. Pme typogr PDF esettind so ut this nal typned, a ogiai Aboriret PREFACE vii ee er book, not from thg, however, cannot bersion for attribution. Preface pnv al pamattiative e origincific forauthorit It is sometimes difficult today to remember that only 10 years ago the osed from XML files created from thding styles, and other typesetting-speprint version of this publication as the adUvwcsictonpuhceiinr fqrctalued eilalutc sbealeduie tDtdyrdiele(neo t Hu cgidStnoomrtheI itffVwiisnaa asm.ttgnHt ) iheeSl, tmdsi lIiltso ib,yVwhcu s mo aeeoen hhdnp anieeianidfcsit veidiehf odrnsemee s fe .ucim tc tfas tteToaih indic u ohcwtoyeiHhsn,eesc ier, nmeIdmao saV ced ivuocoytnAe,ag hr r i eiefhiIansloso D ylaogw tflrbnuhe Sl eildnattea.ke hr nxnrgte eWihod eaes l6emivmys, n e 5 ei 1deh fdp,pt9ed0 eaheli(ce9o0svdnaAt,p0 0etec e niIsl medtDembp.oe diieetw Snco eoc k)dtrinopot bonih nwlc iuome dasatra wi ith eddstesne yt ieus.ew ua ,rbhd Ttnaahhsiu bnkohtafomaldnrnetweno o a edtmemhnweifevaa ff novileefstm o.rhe cr rt,rlfiteDma osstatdls hpcuiu dutteamrhntyicidotsio n tes etifdgn horeareee toenns ptfte mo ohaisi icrrfdewni mid n ee tHaf emrnoitttisIrhhhcusiVstkyceeesst been recompd breaks, heaease use the artUhesnmisniota ceisidnau tbSuestdnta rmtaewteseit t .ah onO fdt nr fateoan c osttffhs ue tsh pieeoef nrfmtesac oitnasinvitn desgn e bertislooos u ootsdhf eaap nlrptdoer dreenuvnacadttliusev.rne icn Msegt a roaontfbye s gHtciaehIcsVal elt lsoei nnapfgrreieescsvet,ise o nhfntor ofwiumner tvhttehhereer, n of the original work has e original; line lengths, woren accidentally inserted. 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Pme typogr PDF esettind so ut this nal typned, a ogiai Aboriret PREFACE viii ee er book, not from thg, however, cannot bersion for attribution. tgophrrfeoateitvrin itE dutidsitnmteeagn.be s lsiiuosafnhnf idinc bgieek nttnwhto eebw esalncce okdpggkereeo ,eo upfnfi ondarg rm ewpathhtoeeirrc ti hast elu xtcthoth e macscoa onkthmceii smst ehii estt aeainselswd u eaexysspts r cradeoiisgmfshfepitcsfr uoelhrittwe.s n aTsrshdiiben lrceeae nrtiodes pnv a broad range of readers. This report attempts to tread a fine line between al pamattiative satisfying the needs of readers who are expert in at least one area and those who e origincific forauthorit amree ebt ethineg n einetdrso doufc aeldl rteoa dneerws. Ftoopri csso.m Teh, eth ceo mmamteirttieale prreecsoegnnteizde hs etrhea wt iiltl cbaen tnooot s been recomposed from XML files created from thord breaks, heading styles, and other typesetting-spePlease use the print version of this publication as the btitcasbsphItthhomhrnoeodoeaaeaa a punotvs ppnltatetiagahsle u rsc retriy,ohemmolTh.da psa vtisictehFr ictatnseeioeisoreanoj t o xssnroos smcgr neiuttrtr e ohio tspe taat whsnah apsuooltnoip ntohiotrafgp ycuettds et nche ossfore swdocrel c pt pisaao nqmewiguw emdls cufohllcoheaedae eeaoftipslfonrtrm rfl e d,ireni ecit io ttocahinsa osohypfn rvsi lfuney reaspee.etio rlih d docoEynalrsoae tepfempg tgpipit isbuporn ea tipsaoudehlosn tajouhsugtteahrf.ohte trstaemruveirRi tseevomat nue d,uf iaenl nouorbbtitttyltsehleihhlleieori t opn-siaseeyhi idp.gon gdrn er a grn c,irtex avw tocrtToeowriotp oi mnae mtsiohe ed ht d pvrefhorsltumo oiahio ii tmcmsgdmnitreoniiitnh tne nniif et cgeaonti eHccnm fasb nceelbytrbestIuee. u' ah lesV ewh stotcni e ihhihsawo onhg iosaevatfdd enstuhov t iri pi ab oe rinacoeorkrdsedrtnaoeifis,re ogostt s fas srheklshi mn deeensuea-oborst s niarbshvwyttrsc osis hssese gensoheft.ayissnro a govcate ootnc iiTanse sHuunaoit nr, haitppnf f,bvIoet ete to gVheeiedotct itp hedhe s t prauniie i eesocenwttrbrl hh peaoon fceeoipeoeatopm epthui cuhsurolniiar,mtetnrd gln tv ip ae fohehsHiiwarorrmotnot togetlh sIhr psemdtieVeiiisoooneecssr::. ginal work hane lengths, wally inserted. nwhAoositwl l t aehsnvee e orrpvc,a ectt uhtaepesrian rt asiro insomkaf al oHjdofIi rsVb eec acoisnonefmd efucionitrtig ot ohninfi sfh eiagncvrftoeeeuc dtup ihn oaadnnse. driAg ntochsrn aeetia s is ste tuhidbse to ulevcn ealsirshk etei hflwteys ,ipt thhatha setta rlpfele r wowasr otiyismteeuasetr ensas,. the original; liccident need Atof tfeorc au sd mecoardee a ottfe nsttriuogn golne tahgea irnisskt sA thIDatS w, tohme elno ginic gale nqeureaslt ifoanc ei.s: Where do on of he orieen a wloen ggeor fnreoemds h tehree ?a tSteonmtieo ni—ndaivnidd uraelsso ucrlaciems— ththata tt hhea veep ibdeeemni cd ihreacst epde atkoewda radn dit nino w digital representatie breaks are true to thic errors may have b tTvsdhieihgeeaeh wt phtp.ca. o oTsBmithn.e emthOs ap,it vtihtfcieeiotnerurs,dar eslas lafltoyihtr ot ltutehhg aehct r nterhedeeacirbroe lgf euna trieuzevri enimd gieo sn trhoceee n p eftr hreouasfsst tairnt ahcgteoi o npnetrino ntdbhu laieontm fg o sttf hotfeilaslnc oienufp gnsi ddioceekurmlnri ieecnss a sist siauo ncindnh. egp naa file: This ng files. Pme typogr PDF esettind so ut this nal typned, a ogiai Aboriret PREFACE ix ee er book, not from thg, however, cannot bersion for attribution. cAcTohhfhm aaaanna tt ggshcseeoii rnmwdcg omid lntleih tctriemnea qduekueenn sitoor emfwt otaluh e sblidoste g nb eegeop - uinmtdreee raempmddreei icc mda o tnahtmodray m tmb iiwestat mietlneiaetrttpna loeuitn nntdeo didi fenr—frie sgrrttoeeaorntn oaftd rouf drsraieo nnssmcdgtai eltftlhnah etctehi i flleiasic tpsba trilt.neeeava dbke es ptohirfago vasHitpoiIoerVncatl.. pnv al pamattiative HEATHER G.MILLER, Study Director e origincific forauthorit CLIHNACROLLENS EF..MTUORSNEESR, ,C Dhairierctor osed from XML files created from thding styles, and other typesetting-speprint version of this publication as the CScoimenmceitstee on AIDS Research and the Behavioral, Social, and Statistical been recompd breaks, heaease use the s orPl ginal work hane lengths, wally inserted. the original; liccident n of e orien a ohe w digital representatie breaks are true to thic errors may have b egp naa file: This ng files. 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