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Retired NBME 22 Answers

nbme22/Block 3/Question#23 (reveal difficulty score)
A 45-year-old woman comes to the physician ...
25% 🔍 / 📺 / 🌳 / 📖
tags: biostats

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 +8  upvote downvote
submitted by b1ackcoffee(115)
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I uothhtg aenrrgidg isht tiosunqe sa HLA eegn diuitnsirotb (en ckl.b)o

neEv fi ew rsacidd ehgiervtny dna tsuj intkh uaobt hte satl tseeecnn ,ostu)ne(qi ofr yan ene,g anhcce fo gsilbin vgniha ctxea meas ellale si 5%2

epposus eterh ear 4 aelllse for a eeng ni rentas,p A,,a ,B adn b (htwa I maen ot asy is all 4 aer rteffdnei in obht pr.nea)ts

Now epopsus one uthedrga has Ba eoy.pe toTgn eahv exatc smea aesll,el htreo eaugdhrt msut vhae

5%0 eancch fo a n(omag a nad A omfr )mdtlioepeuit lmrh b05y % cnceha fo B (oangm b dan B frmo efr)hta

coemdibn ybitpbolira rof yna eeng oluwd eb .2%5

elsae,P ntpio uot yan altuf ni the soinea.grn

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cjdinurdreamz  i usde het amse acetx eainsgnor +
skonys  ufrgnfeiS mfro seuccss vroe eher scabeue I usjt drae it as rtehe one oucls "*6" dan sshe oymsogouhz .aa hsuT her tssesir hsa a 5%2 cneahc fo ebign aa too eubasec ntepnu qeu.ars Mtos byobrlpa the nworg ogilc tub he,y ew tuo e.reh +



 +4  upvote downvote
submitted by bubbles(79)
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naC oomseen leianpx erpplroy who ew wonk atht sthi atirt lloswfo ndaeenilM tesncige adn is mlaautoos ivsrsceee nda mtofrheuerr who teh sratpne rewe ?otghuorsyzee

I egdsesu a tlo on stih qeusnoit and tgo ukylc :(

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niboonsh  oAmoulats nmDotnia ressdidro yluusla erentsp sa eecdtfs in cstalturru sge,en erweh as lAmostuao seecevsRi ordesrsdi lauyslu rtesnep sa yzeemn eincifeesidc. 40P5 si an ez,nmye os we aer rbaloypb lindgae htwi an ulsmtoaao ecvreeiss osd.iedrr toreeufrhmr, teh eqstunoi atetss ehert asw a hzyso"ugoom nsercepe of .4".....0p5 nI aomsatluo scesveier spbrmle,oo aenptrs rae lulsuya ,tehuzyogorse anemgin ttha 4/1 fo ethir dikdso liwl be etefcfda aak( hzouygm,)oos 1/2 of eth ksdi iwll eb ,caierrsr dna 41/ fo tirhe sdik liwl be fcutaednf.e +38
nwinkelmann  sI shti ohw ew ohsdul tackat shti emr?:opbl Fstri ceul isagntt edfnxeion si taevci ieaebmtotl of fieanTmox douhls amek us czigenroe hits deirungn tsirf saps aecipht Y05CP4 e?matsmbloi Oecn ew nkwo t,tha eht atfc atth eth labeitmote si esaceder tuesgsgs an eynmze ,eecfdt cwihh si pterduspo by e'snptait hzygooomsu yzenme l.allsee eThn ues hte largeen elru ttha mneezy efcdset rae RA hewsera srcuurltat oernpit sfcdtee ear DA itnenhierac tt.parse eOnc we wokn het atr,nept ktinh tath mtso oommnc smrssnionati fo AR esmoc mrfo owt crerair rantse.p oS sgofprifn ealsell = 2%5 ygsoozmuho l,moanr 05% zyhruooeetsg irea,crr nda 52% umsgyoozoh cd,teafef tuhs isetrs sah a 52% fo nvghai eth ames eeallls as teiatnp ..ie( oohgsymouz C4YP50 264D)?* +6
impostersyndromel1000  we had hte acxte aesm hhutotg c,spores os i too am inhpgo htsi is hte etcorrc ywa ot pahoprca itgt e eoagnsnri rfenid +
ajss  naskth orf tsih axl,tineapno I ytaoltl fgootr uaobt RA aespttrn aer mtos leyilk zenesmy ieecfi,edcsni stih idnk of kmae eht isntqueo iaeers if you cohrppaa it ttah way, tnkahs +



 +3  upvote downvote
submitted by dentist(94)
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  • yeenmz cfidenicsye = RA

  • uoyozohgms npeeresc of ."PY..C

QED: osgmyouhoz + AR = 2%5

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 +1  upvote downvote
submitted by its_raining_jimbos(29)
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anmiexfoT ahs to be iaomtldezbe iav tisfr ssap iletsoammb ot an eiavtc tiltboeaem n(odi)xf.ene eTh aenttip hsa dreaedesc rontntnocsciea fo hte zoadmebleti dcopurt ingdcitina tath het ’iaentpst arip of cyheomtcor P054 lellsea eat’rn nmeabgtiolzi fxnteaimo yrccl.reot Teh nsiueoqt is iaknsg hatw the nhccsae rae teh srites hsa hte esma p,ygnoeet chiwh owdul be 25% t&g-;- /21 * /12 = /41

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medschul  owH do ew ownk hte esnatpr aer nto uymogoohsz +8
yotsubato  ahcsCen aer ehyt are nto ulsesn etyh hda or rea usnotucise +



 +0  upvote downvote
submitted by 07chess(3)
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kihnvtgOrnei cserdwe me. hTe oitqunse estm akss for a cnache for a tisser to tge the emsa a,elelsl ton ttah seh is mhuooosyzg iwht .hetm So I kcpdei 57% nsadeit of %tA2 .5 eth otp fo ,it htye tup 6*4(DI2 thtoguh ttah asemn ahtt .pt hsa 4 icspeo of wt(elollase fomr heca etarnp ilek AL.HyTe)h ehva to mkae qsousteni bisipolmse ot tunsr.dedan

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 +0  upvote downvote
submitted by g8427(0)
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If eoms noe cna phel me dntsnuedra bc im a itb nocsfdue. I ranuddsnet teh htothug ocrssep nda I adzireel ahtt tshi aws na AR siseead dan I lsoa ogt eth 1/4 cfeft,ade 21/ arierrc dna 41/ cfeetduf.an tuB I ecosh %0 cb I dueigfr fi it wsa an AR deasesi eth 1 hdicl eylrdaa idssaeed asw ugoyoszomh dcateffe 4/(1 tef.e)cadf icWhh leda em ot kithn ttah het rhtoe rseist swa eireth a iarecrr or ont teaedffc at .lal mA I just erov iihtgnnk hist or am I nto lfuyl unedgtnrnsdai waths iggon n?o

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rush  uoy aehv ot nkhit uatbo ehac hdlci d,vuilnlaiiyd dsnte'o martet hwat hte ilbnsgsi e.vah hTe euitqson ttssae thwa era het ddso of hte dchil gtneitg eht eeid.ssa oS sgrlaseerd of hte ehort sgiblnsi ti ltlis is omM )1/2( dad (/2)1 wcihh ksaem it /14 RA +
titanesxvi  But owh do we wkon ttha hte tparsne aer hestzygoerou orf hte iaotmunt +
need_answers  we owkn ttha teh aetsrnp heva ot be yohtoeeusrzg Aa X aA eeabucs no a 2x2 bte,la het ylno yaw teh utadrghe ludco eb oyhosumzgo rof an RA si by invgha tbho tearpns be rcsareir (aA) so eth onesqitu swa ganiks wtah aer eht hcncaes the sseirt sah het emsa lsellae aa() and heetr is ylno a %52 of gvnhai the saem llesa.el +



 +0  upvote downvote
submitted by timekeeper36(0)
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So I hate sith oneuitsq esebauc uyo tna'c eltl atwh eth sa'eprtn ypeseotng .are hisT nyezem fcedte n'sti gehsotmni ahtt you nca ltel gclpinoaehltyo so we tcn'a tsju auemss eth nersatp rae n.oeegheoesutr

It yeholtsn oet'ds evne etratm fi ti is amoltsoau eeisrvecs ro ton nisec we nlyo vahe to rywor uoatb ozoosyhugm off npisrg.s rHee is hte am.th

tPaenrs oesipslb toeg:neyps

A - rao;mNl a - nboaarlm.

oM:m aA d:Da Aa hawt( hte seiuntoq is usam)nisg

mMo: Aa adD: aa

:Mom aa Dad: Aa

Mom: aa da:D aa wo(h is to ays tihs it'sn ip)s?leobs

oMm( AA or Dad AA si iolssimepb ceisn teh gosrnffip na'ct eb aa)

roFm setoh potyenge essiptsbiiloi ew can ctlleauac tetbre o.ptasriibblie

ineSc i'st oebislps rof arsntpe ot vaeh yna of ehest 4 tseyengpo ew tusj aesums ttah ahce blitpioisys si 1./4

M:om aA + :adD aA &g-t; pornfisgf aa = 41/ uymill(pt tish by 41/ inesc ew're ssnigmau ealuq sibisipylto rfo tehro onpeestyg) ;t&g- 6/11

Mm:o aa + :Dad aA &-g;t fgrosnpif aa = 12/ g&t;- /11*24/ = 8/1

Mm:o Aa + D:ad aa ;t-&g ionfsrpgf aa = 1/2 g&;-t 21/1/*4 = 8/1

om:M aa + Dad: aa ;-tg& firpsngfo aa = 1 -&;gt *14/1 = /14

enTh we dda lal eth lirbsieopibat /goeht1t6e1r + 81/ + 18/ + 41/ = 1/96

I wnko the nuq'eotsis enrwas is .2%5.. so I eussg ptu %25 on eth .stet TUB if uyo wtan to aculytla nntadredu,s stih is a eretbt atpxopa.iirnom ehT nloy rbmople si we dton' wonk eth enge rtstoidbiinu fo eht leleasl or I anc vgei ttbree tamh :P

Srryo ist' ognl and gfnncisou

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submitted by fukprometric(3)
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Teerh was a olrwdu qitunoes on ihst. LAH aer ssepda ownd ot ofgsirfpn in sphepyatlo. tnrPae X ahs A dna B peaophty,l narpet Y hsa C adn D pl.teyhaop heTse eavh naliedMne ti,neihcenra ..ei .RA fI hte ettpani si homogyouzs fro p62,yCD atht samne htta rntPae X nda ranetP Y both hvae a aphlpyteo thiw P.DY26c :.ei A helyoatpp sha yp2,6cD C tayhpoelp sha c6p2yD

Fro reh ,esirst hteer si a 0%5 ccenah mmo epsass wond rhe A top,lyahpe nad a 0%5 hnacec the dad peasss ownd hsi C hyatoep.pl 2/1 x /12 = 1/4

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