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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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hsit ienqotus amkse me nwat to eat na e olic eicook dan peho i beeld uot

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caitlyncloy  icpk C adn emvo no saw my esytatgr :P elhp llo +2
thegooddoctor2  oll good noe +1
sparta  LOL hntak ouy rfo iths mecomnt +


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 +15  upvote downvote
submitted by doodimoodi(74)
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dDi no oen tnoeic htta eth sddO roati on hte opt left is ?nworg Am I mngissi n?otgeihsm fI you ccaltelua it, 'ist 6 tsuj kile het opt tghri no..e..

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mjmejora  tahts autllacy ayrlle fyunn +
yex  Baceues I asid s,o iplsape ...rhee -:/ +1
doodimoodi  Cnat evlbeei ew ayp $06 for itsh pcar +50
aisel1787  tbse motemnc oooiid)odmd +1
b1ackcoffee  tath nfiukgc trehw em ffo on mea.x I was liek is etehr an eftfce ioinmcofitda by "Not rkdining "m.kli eth uc!kf +2


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 +8  upvote downvote
submitted by sne(59)
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OR g&;1t taiecdnsi ecersdian recnecocur of eve.tn ehT yonl RO raeterg tnah 1 aws in the belta atht cdatniied htat het ebscjut tea oiescko tbu dd'int nkrdi lki.m ,Thus ttha is the olyn neo ihtw a gnaiifisctn neuroceccr

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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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roF lopepe ohw rylelnaeg dah belrtuo idegarn teh otw carsht:

isFtr a:trhc eW aeasredtp eth eernti puoianlpot toin wot lsrleam ooulatspipn ot ttse ofr teh kseoioc eaft.fc nI oinaPulpot A adr(kn mikl) reeth swa an osdd itaro fo 6 tpyo( in teh aatcul ct.har) nI iouPlonpta B (idd otn inrdk )mikl erthe saw an odsd atoir of 6. nceiS hte odds itsoar ear tno ,1 we cna doulnecc taht het csookei veha na efectf sesrergald of eth ntlpoapoui (ie kdanr mlik lopeep vsurse nidd't dnkri ikml pp.leoe)

donceS :rtahc wNe set fo lusptooinap ot estt orf hte ftefec of .klmi nI puiPnatolo C a(te oes)okic trhee swa an dosd toari of 1. In ntlPoopuia D idd( nto tae kcseooi) ether wsa osla na sdod taoir fo .1 shTi nmase taht mlki did otn ehav an fcfeet vree nda d'dnti tierocnbut to the eed.sais

Oly"n kceoosi are nnltdyedpneie isdoatasce tihw .E loci casse" nseam that olny teh keoocis aecsu the dsaseei wotithu eth cfsfeet fo gmhsinote ee.ls

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 +7  upvote downvote
submitted by pg32(218)
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heT atcf hatt the osdd ioatr in het pot tlfe is einrcoctr asemk hits teiuonsq yrve .tufliidfc tI ksema ti apaper sa if eth icseook ear saietacuv tub teh mikl ahd oems etprvteoci otar.fc So os.nuoibox

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drpatinoire  odG I hhugtot atlyotl het mesa way as yuo i.dd I atrsed at ihts suqtoein rof ta latse 5min nad dseak emsyfl h'twas rwnog ihwt ym .icssttsita +1


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 +7  upvote downvote
submitted by youssefa(162)
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initllIay imkl kiidnrgn saw ideastaocs whit l.cioE rakobteu tihw .RO=39 nad lP&.t0;001 gtaSii(cn.f.).in eAftr itsractniofiat itno eat skeicoo and idd nto tae kiosoec RO bmceea 1 aedisnt fo .39 mgnaeni the ssconiaotai aadpdeep.irs roehfr,eeT gnteia cksooie was a ruecofnndo nad etrhe is on elar ctoasoansii eewnbte nrkgindi mkli dna sl.eia.t.Eoc,.d.in si'mkl h(te uoceordn)nf nntbocitoiur aws slrenebopis rfo eth OR of .93 in eht rstif epl.ac hiTs was erurdtehf tmddenarsote with RO of 6 ni teh iooskec elona .rgupo

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 +1  upvote downvote
submitted by sattanki(82)
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ihsT eno herte erwe four osdd trosi,a eno eiovrpdd duenr hace elab.t hTe ylno one thta dah an dosd aiort rterage atnh 0.1 was the atebl ni eth pot itgrh (sdOd aotiR = 6, I ebeli,e)v hiwch ewhn uyo loedko ta eht ,bleals led ot hte ihrtg s.waenr

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submitted by famylife(110)
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An" dsdo triao fo 1 eindcstia ttha the tnidoocni ro etvne uendr udtsy is lluayqe iklely to ccoru ni obth up.gsro nA dsdo iraot eagrrte nhat 1 ieicstnad ttah eht nioitodnc or tenev is emro leykil ot cucro ni het rftis u.oprg" (neisraootiddhdkg_Oripiwatt/w.k/i:p.i/se/)

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submitted by xw1984(8)
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heT OR in teh eppru tfel 22 tabel is oc,tnirecr wchih suhldo eb 6 72(/2*636 )=6, ont 1. ishT smane eht OR of e"at "iskeooc does ont ahecgn arfet ttroaaciiifstn yb krd"na ,milk" os an"kdr kilm" si nto a drf,onecnou and tae" ecikos"o is tepdenyeldinn oass w/ EEHC atk.eubro

nO hte hoter ,hdan OR orf nadk"r ilkm" gnchade a lto mrf(o .39 to 1),0. cwhhi iitcseadn a"krdn i"lmk ighmt eb a nfcorneuod da,n ret,rfhoee is otn ynpnntiedeled ssoa /w EcEH aorubtke.

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 +0  upvote downvote
submitted by an_improved_me(91)
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A etiquson i omer geylareln aehv .i.s.

Is it peslosbi that henw oyu tafstryi eht dt,aa e(.i. rmogapicn the ftcefe thta inaegt okeosci ,has in elpeop owh irnkd lkim or peeplo who od not nkird )lmki atth eth sodd itrao wlli hwso nngeifascici ofr one tub not hte rohte?

idSa ye,nefftrild ni eth apxmeel obae,v clodu gtaine iskecoo ni elpeop who iknrd klim elda to a cfitisngnai nsiraece hte ikrs fo ,ioitfnnec tbu tno ni eppelo hwo ohw ddn'ti rkndi lmik?

'Ive lekood rdoanu ni hist nmecmot r,daeht and vhae eesn eoppel mneiton teh tmer ecteff" nmcitdiioo";af si ttah ahwt ym mxpelae vobae wudlo ?owsh

In theor wo,sdr fi aitnge ikoesoc + nginikrd mkli dlase ot a fitngsicani ik,rs tbu einagt isceook + otn giindknr imlk sha on dssatcoiae ,rski dwlou hatt emna thta eht lmki sha na ffete"c "iidiocmnatfo no teh skir of tggntie ntnofciei ni peepol hwo tae scoieo?k

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 +0  upvote downvote
submitted by unknown001(9)
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tish si a nsbuo sueno.iqt

henw dosd toair si ,1 nmgneai on ssaao,niitoc

dosd i;tort&ga ,1 icwhh ni ihts ueiostnq is 6, mnesa sinsoatocia

eewhr is osdd traio ? a) ta hte eat inctoo-oiedkd rdnki mkil m.onucl nhcee het ,sanwre oynl oeckoi ypdidneennlet s.sa ihtw e cilo

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 +0  upvote downvote
submitted by tyrionwill(22)
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we nca meka stnhig eimspl liek htsi wi ayf: we awtn ot nokw eewhhtr 1,rXo 2X srlrtaeoce ,Y we sjut slapeyeart estt 1X dan ,Y adn 2X nda Y igyoa.drccln nh We etst 1X iwht Y, ew uerqeir no X2 ure;xpseo eWnh tset 2X wiht ,Y ew rqruiee no X1 ;xereusop

eW etts ecioko thiw r,dhariea whne mkli was tno rudnk to(p :thg)ir vipistoe W e stet kilm wthi redi,arah henw on eckoio aws eneta o(lrew thri:g) iegatenv

cuosoc:ninl nlyo ikoeco rcreatoles to het airehadr

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 -5  upvote downvote
submitted by lilmonkey(63)
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hTe oerywkd si L(cPoN"ss"YEtIDeTNiE)aDaNdE. icWhh in uhman eugnlaga aesmn TNO" .CDTAISAOES"

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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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