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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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ihts siouenqt kmaes me tawn to aet na e lcoi icekoo nda hpeo i ledeb out

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caitlyncloy  cipk C nad evmo no saw my yerttgsa P: ephl lol +2
thegooddoctor2  lol ogod noe +1
sparta  OLL tnkha ouy rof sith cenmtmo +


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 +15  upvote downvote
submitted by doodimoodi(74)
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Ddi no oen niceto tath het Odds toari no hte pot etfl is nwgro? Am I mniigss n?eomgthsi fI oyu ucalcltea it, ti's 6 ujts leik the pot gthri e....no

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mjmejora  tshat uylalcat llraey nufny +
yex  aBeescu I idsa so, siapepl e...reh -/: +1
doodimoodi  antC veeielb we pay $06 for tsih rpca +50
aisel1787  best emocmtn )oddioiodmo +1
b1ackcoffee  thta infkugc rwteh me ffo no .xmae I saw eilk si erhte na fcfete ociitamnfodi yb "tNo rdnigkni mil".k the uk!fc +2


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 +8  upvote downvote
submitted by sne(59)
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OR g&1;t ectiinsad csrdnaiee norrcucece fo .evnte Teh only RO agreetr nhat 1 swa in het taelb htat tenciidad ahtt hte sbutjec ate ikoosce tub ndid't ridkn likm. ,Thus ttah si eth oyln noe whti a sitaicinfgn ruencecrco

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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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rFo pepelo woh leyganrle had rlouebt raiedgn eth owt sac:thr

Frtis ch:atr We tedapesar teh nieert loptniapuo oitn two larselm iosltppaoun to etts fro hte ocokise ecfa.tf In onoatlPipu A nr(kda m)lik heter wsa na odds oaitr of 6 t(pyo in het atulac chra).t In nluaiPootp B (ddi otn dnirk )imlk rehet wsa na sodd taior fo 6. ieScn teh ddos trsioa ear ton 1, we acn olcdneuc ahtt the coeoksi ahev an eteffc reelssgadr fo hte pnuiootpal ei( rakdn imlk epelpo suervs intd'd nidrk limk p.pe)ole

codeSn :hatcr wNe ste of atnusoiplop ot sett rfo eht fectfe fo l.mki In auPntlopio C e(at oosei)ck ereth asw an dsod arito of .1 nI tinopuolaP D ddi( otn tea o)soieck eerth wsa aslo na dsod toair fo .1 sTih esamn hatt lmki idd nto ehva an ecffte erve and 'nidtd ucobtinert ot teh s.dsiaee

l"yOn oikecso are ipltdedynenne deasosaitc thwi E. lioc sesca" amens htat olny teh kocsoie csuae eht seesdai thiutow hte cfetfse of gensihomt l.see

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 +7  upvote downvote
submitted by pg32(218)
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eTh tafc htat eht odsd oatir ni teh pot ftel is eicrornct masek tihs nqiuetos yrve iff.lcuitd It smake it appear sa fi het coskioe rae iaueacvst but eht milk dha emos cvipteeort rcfota. oS ooxiuob.sn

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drpatinoire  odG I houhttg atltlyo het aesm ayw as yuo id.d I sdtrae at tish sqiueont for ta alste 5imn adn kased ysflme hsatw' ongwr hitw ym i.tsticasts +1


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 +7  upvote downvote
submitted by youssefa(162)
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lailitnyI lkmi gnkirind swa tcsaoisdae whit l.Eoci ukroetab hwti .9=O3R dan l0&P;.t100 tc)Sgnifi.(..ina Aretf isoittifcratna otni eta oseicko nad did nto eta eocsiok OR mceeba 1 nedtias fo 9.3 eganmin eth acitasoiosn .sidaepdepra errfhTee,o antige ioskcoe swa a cudeoofnnr adn treeh is no elar aaitoscions ntbewee ndknirig mkli nda .t.dn.asii.,.coelE 'iklsm teh( ocuenfndr)o nitrobcotuin saw soelrnpisbe rfo het OR fo 9.3 ni teh sftri lae.cp iThs aws rrdhuetfe odttemnaersd tihw RO of 6 ni eht eciosok oanle .pogur

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 +1  upvote downvote
submitted by sattanki(82)
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sTih oen eehrt weer ourf sddo or,isat one didpevor uedrn aceh late.b heT olyn neo hatt dah an odds irato rrteega anth 10. was het abtel ni the pot ithrg (dsOd itRoa = 6, I vile),bee hcwhi wehn uyo kedolo ta the lb,asle lde to eth hirtg neawsr.

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 +1  upvote downvote
submitted by famylife(110)
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"nA ddso iorat fo 1 ncitdesia ahtt the icindnoot or nvete runed stdyu si ellqayu kilyle ot cucro ni thob srgo.up An dosd roiat treaegr ntha 1 ciiseatnd taht the incniodto or event is meor kyeill to orucc in teh sirtf p."gour (g/.eehpidisortawpkiir:ik/n/diwO_tsad/o.t)

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submitted by xw1984(8)
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heT RO in het puper elft 22 eblta is et,cricron iwhch sudhol eb 6 2(7/*6326 ,6=) tno .1 ihsT asnem teh OR of e"at co"okise odse nto gnceha efatr rtfnttiaiisoca yb adkr"n lk,m"i os n"rdak klmi" si nto a udnnoro,ecf nad e"at sieko"oc is tnindlpyneeed saos w/ CEHE utkbare.o

On hte otrhe nd,ah OR orf kdna"r mli"k acnhged a olt r(ofm 39. to 10.), hihwc disctenai nkda"r kil"m mihtg be a dneunfrooc and, eeo,fehrtr is tno lednentiednyp asso /w EcHE ktoue.rab

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 +0  upvote downvote
submitted by an_improved_me(91)
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A nqtiuose i meor lnrleaegy ahve i.s..

sI it psslbeoi htat hwne uoy riytastf eth ta,da .(ei. manciogrp eht ecfetf htta enigat eoskoci sh,a ni pleope hwo indkr imkl or oppele hwo od not riknd likm) atth eth dods airot lliw wosh ciisncaifgen fro one tbu tno het hreo?t

dSai reeif,dntfly ni het apxelme aveb,o cloud egtnai oicokse in pepelo woh dinrk klmi adel ot a iiagfcsnnit ainscree eht kris of e,iofninct btu not in oeplpe ohw how tn'idd kdirn ?mikl

e'Iv edkloo rdanuo in shit contmme rdt,hea nad ehav nsee eepplo tmenino het rtme c"eeftf ocfia;ioidtn"m is ttha twha my amlepxe aobve wdolu sho?w

nI treoh roswd, if gitaen keocois + rdnkniig imlk alesd ot a inncfstgiia is,rk utb neiatg oekocis + ont niinrgdk likm has no ostasaiedc ksri, ldowu taht amne taht eht lmki has na e"ctffe omafdctii"ino on hte ksri fo itgtnge eoficitnn ni lpeoep how tea ocsik?eo

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 +0  upvote downvote
submitted by unknown001(9)
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isht si a snuob .sqiuoent

hwen ddso rtaio is ,1 nnemiga no o,oaciaisnst

ddso tg;otair& ,1 wihhc in this tuqosein is 6, smean ooaaintciss

reweh is odsd traoi ? a) at het aet o-dioientocdk kndir lkmi ulmno.c hence the es,arnw lyno ickoeo neydpnldeenti s.as htwi e iocl

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submitted by tyrionwill(22)
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we cna eamk itgnhs mispel ekil sthi wafyi: ew wtan to kwon teehhwr ,rX1o X2 eeasrrctol Y, ew ujst eparlaytse sett 1X dan ,Y and X2 adn Y lcrand.gciyo nWeh estt X1 twih ,Y we urrieeq no 2X pro;uesex Wehn tset 2X wthi ,Y we eiqrure on X1 uerx;opes

We ttes keioco wiht ea,rirdah henw lmki wsa otn rudnk o(pt :)ghitr poeisitv We ttes kiml hiwt arr,hadei nwhe no iecoko aws netae erolw( gi:)rht nativeeg

o:lcnsnouic ynol oioekc erlartesoc to het hraaiedr

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submitted by lilmonkey(63)
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hTe orkdyew si (IiaPdDE"EaEto.YsNTL"NND)sce chWih ni unamh aeugangl ansme O"NT .OA"ISTDSCAE

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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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