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Retired NBME 24 Answers

nbme24/Block 4/Question#30 (reveal difficulty score)
An investigator is studying an outbreak of ...
Only cookies are independently associated with E. coli cases 🔍 / 📺 / 🌳 / 📖
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 +67  upvote downvote
submitted by ∗niboonsh(409)
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sthi eoitsnuq maeks em wnat ot eat an e loic oeikco dna ophe i deble uot

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caitlyncloy  icpk C nda mveo no saw ym rytegats P: hepl llo +2
thegooddoctor2  oll odog neo +1
sparta  LLO knath uoy fro shti emmctno +


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 +15  upvote downvote
submitted by ∗doodimoodi(74)
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Did on eon iotenc thta het sOdd iotar no teh pot etlf si o?wrgn Am I ismsngi mngstieoh? fI you acuaelclt ,it ts'i 6 tjsu elki eht opt rgtih ...one.

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mjmejora  athst tcllyaua yelalr nyunf +
yex  acueseB I adis s,o ipeplas ere..h. /:- +1
doodimoodi  atCn leeievb ew ypa 0$6 orf tihs crap +50
aisel1787  tebs cmtoenm dooido)odim +1
b1ackcoffee  tath gkcifnu hwret em ffo on axe.m I was ilek si erhte an eeftcf iiootnfdmcai yb oNt" gdrnkini l"imk. het cfuk! +2


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 +8  upvote downvote
submitted by ∗sne(59)
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RO 1gt;& isetdncia ecidnrsea rceuccrnoe of n.tvee ehT olyn OR egrtera anht 1 swa in the teabl that tdceiinda htta eht stbcjue ate siockoe tbu n'iddt rkdin kilm. suTh, ttah si eth ynol eon wthi a ganiitcinfs cconrrceue

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For a more systematic approach. First look at cookies p-val is sig when not stratified, the top table is stratified the OR > 1 => sig => cookies have association.

Then look at milk p-val is sig when not stratified, the bottom table stratified the OR = 1 => loss of significance => milk have no association.

+1/- peqmd(75)

Uworld ID 1173 has a good explanation for how to look at stratified analysis.

+/- peqmd(75)

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 +8  upvote downvote
submitted by ∗qiss(20)
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Fro eppoel how yeelragnl adh tueborl rdegnai eht otw ch:rsat

siFtr arch:t eW paedatres hte irtene anuioolppt otin owt selmalr pstnuiloopa ot etts for eth ceksoio ffatec. In iapnlotuPo A d(kran mi)kl rehte swa an odsd iatro of 6 op(yt ni the uaalct ha)ct.r In otpuPalino B (idd not rknid m)ikl htere swa an ddso traoi of .6 cnieS eht odsd otiasr aer otn 1, ew anc cnceuold htat eth sookcei hvae na fetfce gsrdreesla fo teh toiuonalpp (ie dnrak mkli oeplep euvrss d'tind nridk ikml o.lpepe)

oeSndc ca:hrt eNw tes of oislppantou ot tets orf eth cfftee of ilm.k In niooatPlpu C e(at osicoe)k eehtr was na sdod oatir of .1 nI opuPtilaon D d(id not tea oekoi)sc htree saw lsao an dsdo rotia fo .1 Tish samen that ilkm ddi ont avhe na ceteff reve adn dtdn'i oitbtecrun to hte aesedis.

lOy"n kscoieo are ypleidtednnen taosadiecs wthi E. cloi ssac"e namse hatt nyol het esociok aecus the esisaed ottwhiu eth tfsefec fo eognistmh .sele

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 +7  upvote downvote
submitted by ∗pg32(218)
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hTe fcta htta eth ddso aotir ni eht top ftle si rorteincc keasm hsit qstnoeui revy .dliufctfi tI emska ti raeppa sa fi het sekcooi aer ivsuaatec but eht kmli adh emso icevotrpte af.tocr oS ioun.sooxb

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drpatinoire  Gdo I tutghoh allytot het sema awy as yuo id.d I dtsrae ta isht qsteiuno fro ta astle nim5 adn akesd sfylme ahswt' wgrno htwi ym assisict.tt +1


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 +7  upvote downvote
submitted by ∗youssefa(162)
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lyaIiinlt mikl ngndiirk was casatideos whti c.iolE orkaeubt twih O.93R= adn 0.P1;&l0t0 nn.fSt(.aii)i.gc etrAf tnaiotftircias oint ate eiookcs nda did otn ate okceiso RO bceame 1 dnatesi fo .39 gnmaine eht tcoiasianos daerp.dpaesi ,hefeTroer itnaeg ociesko saw a noneoudcfr and trehe si on rale onatiasicos ebetenw krgdnnii lmki dan n.s.o.,Etlaedi.i.c slmki' the( necr)ufdoon otiuonbnctir asw npseelibrso ofr eht RO of .39 in the rtsfi l.pace hTsi wsa dfterrheu asrddetnemot tiwh RO fo 6 in the kocesoi alneo .uoprg

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 +1  upvote downvote
submitted by ∗sattanki(82)
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hTis eno hteer eewr ufro dods srot,ai neo rivpdode eurdn aech belat. eTh lyon neo ttah adh na ddos itroa etrrage hnta .01 asw eht btlea in het pot hitrg (sdOd ioatR = 6, I evei,)leb ihchw enwh yuo koeldo at teh lsebal, eld to het thgri ernaw.s

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 +1  upvote downvote
submitted by ∗famylife(110)
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"An sddo atiro fo 1 etsdniiac ttah het ndtcinooi ro envet dnure stduy is uaeqlyl elkyli to ccuor in boht prsuog. An dosd orita erargte nath 1 isatndcie htta teh ionondtci or nveet si mero kelyli to coucr ni eth rtsif "rg.pou (psn_oh/Ogdta/idsdkriwiet:rt/apiwi.i./eok)

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 +1  upvote downvote
submitted by xw1984(8)
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The RO in het prupe flet 22 elbat si neci,rcrot hiwhc uhodsl eb 6 (27*632/6 =),6 not 1. Thsi smean eth OR of "eta ooes"ick dseo ton hnagce retfa ctranttiifsioa yb rk"dna im,kl" os ard"nk kmi"l is ton a ,ndooecrfnu nad a"te e"cookis is dniyelpnteedn ssao w/ HCEE b.aetourk

nO eht orhet a,dnh RO rfo "dkarn il"km nhdcgea a lot mr(fo 9.3 ot 0),.1 hchwi dencsiiat adk"nr kmi"l himgt eb a dunrnocefo a,dn ofr,eehtre si otn ynedtdpinenel aoss /w EEcH eukota.br

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 +0  upvote downvote
submitted by ∗an_improved_me(91)
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A tqsouein i orem yalrnlgee heva is...

Is ti eobplssi atht nhwe uoy rsiattyf eth a,dta ..(ei paigomcnr het etfecf atth tngiae ioskoec a,hs ni oleepp hwo kndir mikl ro eloppe ohw od not knidr )kmil atht teh ddos rtoia iwll hows inscnaeiigcf rfo oen but ont eht ?rheot

Sdia ,niydlfeetfr ni the mleaexp ovb,ae olcud agneit osckoie in poeelp how ndrik mikl dlae ot a isgatnicnfi censaeir teh iksr of iife,tocnn tbu tno in epoepl how hwo ndtd'i idrkn ?iklm

'Ive dlooke rdnauo in tshi motcmne ah,etdr adn heav ense lppoee itoenmn the etrm cete"ff ioiom;"ficdant si hatt wtha ym pxealme vboae oludw s?hwo

nI ohret sw,dor fi gtaine iecoosk + nrdkiing ilmk daesl to a afiisnncgit k,sir but niaetg oksioec + not ingnirdk limk sha no tidsacesao sr,ki uwold taht anme that het mkil hsa an e"fectf fian"dmtooiic no eht iskr of nieggtt toinfcnie in oeplpe owh eat e?kiocos

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 +0  upvote downvote
submitted by ∗unknown001(9)
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stih si a osnbu is.qtenou

enhw ddso tiaro is ,1 aeimngn on itnaiscao,so

ddos ta;&tgroi 1, ihhwc ni ihts eotsuqin si ,6 asmen sacinotaiso

hweer is sddo aitro ? a) ta teh eat toindeckoo-id kdinr lmki o.clunm nchee eht w,aesrn yonl ekoico nipdneyeltden sa.s itwh e cloi

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 +0  upvote downvote
submitted by ∗tyrionwill(22)
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ew nca kema gsniht iempsl kiel thsi :ya iwf we tanw to kwno eerwhth 1,orX 2X sotelrreac Y, we tujs sletaerypa sett X1 nda Y, dna 2X nda Y cod.rnliagcy Wen h tset 1X twih Y, ew erqieur on X2 rx;eoupes nWh e tste X2 tihw ,Y ew reuriqe on 1X oepr;uxes

eW ttse icoeok hiwt raideh,ar hwne iklm swa ton nkudr p(to t)grh:i etisvpio eW sett ilmk htwi r,derahai newh on ioekoc wsa aetne ow(lre g)itrh: geevatin

ocso:cnluin lyon eokoci streoearcl ot eht aredahir

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 -5  upvote downvote
submitted by ∗lilmonkey(63)
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heT rywoked si LY.DIN""tseic(NNoEP)EdaDaETs hhcWi ni mhnau lnugagea enmsa NT"O TAI"OC.SASDE

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I agree it's a poor choice of words but what they mean by "independently" associated is that which of the variable is the only one associated with dz without any confounding.

+1/- peqmd(75)

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