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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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thsi eqtuinso mkeas me atnw ot aet na e lico kooiec nad hepo i belde otu

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caitlyncloy  cpki C dna ovem on aws ym gtesyrat P: lehp llo +2
thegooddoctor2  oll gdoo neo +1
sparta  LLO athkn oyu rof shit mtmcnoe +


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 +15  upvote downvote
submitted by doodimoodi(74)
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iDd on eon tceion thta eht dOsd rotia on teh otp left si nogw?r Am I iinmsgs shgmieto?n fI oyu eautclcla t,i is't 6 stuj lkie eht pto htrgi no...e.

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mjmejora  htats laulycat lyalre unfny +
yex  ecuesaB I sdia ,os lpaiesp r...hee /-: +1
doodimoodi  tanC vieeleb ew pya 60$ rfo htsi pcar +50
aisel1787  tesb mocntem odmdiiodo)o +1
b1ackcoffee  tath gnuifck wrhte me ffo on .exam I asw kiel si treeh an etffec odanfciiotmi by Nt"o krindnig .mi"kl eth uc!fk +2


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 +8  upvote downvote
submitted by sne(59)
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OR gt&;1 dancietis dnecisear rcouceencr fo nteev. The lnyo RO eetrrga nath 1 was in het tbael tath eicniddta thta hte ctsjbeu eat oieckos ubt tn'ddi dnkri lkim. s,Thu atth is eth only neo htiw a tcfgiansiin cccrreneuo

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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 leeppo owh lreygnael ahd olbtrue ndgeira eht tow tar:hcs

rsitF rtch:a We tapesaedr teh rtinee pualpnooit itno owt elarlms puapitnsloo ot estt rfo eth icoesok fcet.fa In upalootPin A rna(dk lk)mi teehr wsa na odsd trioa fo 6 py(ot in teh atluac t.)rhac nI pulPaoonti B di(d ont ikndr )kmil hetre saw an ddos artio of 6. nciSe the ddso irstoa rea nto ,1 ew nca ocdlucne htta hte kocoesi hvae an ftcefe asrrgeesld of het uoiltoppna (ie krnad kiml oeelpp vuerss tddi'n krdin mkli po)peel.

ocndeS ha:rct ewN tse of ialpsuonpto to stet orf the eecfft fo mikl. In niaulooptP C (ate eosciok) heter aws an dsod ortai fo 1. nI auolntioPp D (ddi tno tae )iksooec etehr swa losa an dsod atior fo 1. hisT esanm ttha kilm idd nto vhea na ftceef ever nad dtndi' iouncrttbe ot eht ie.essda

On"ly sekicoo are ynielntdedepn oetacidsas twih .E clio s"caes amesn atth noyl hte soiecko saecu teh saedesi otthiuw the tfeesfc of sngiohemt else.

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 +7  upvote downvote
submitted by pg32(218)
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Teh fcta atht the osdd rioat in teh opt eftl is crerctoni mkase this itqsonue yvre flticdif.u tI sekam ti apearp as fi het keioosc are ceauvisat ubt teh klim dah msoe ceoetrtvip tofcra. So bxs.onooui

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drpatinoire  Gdo I thoguth ltltoya eth asem way as uoy .did I sadter ta hist qnituoes orf at teasl mn5i dan eksad yesfml hwsat' nwogr twih my stsit.isact +1


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 +7  upvote downvote
submitted by youssefa(162)
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aItinylil mlki niinkgdr saw sodatsaeci hwti lcEi.o uetarkbo twih 3R.9O= nad .l;&0t10P0 niSnafi..cti)(g. Areft tnioctiairstfa iton eat isoekco nad idd nto tea ecokios RO ecbame 1 danseti of 39. iemngna het stsnioicaoa ddp.eraspiae ehfrTee,or genait ookseic swa a odnoncferu and ehetr is no eral otcaasoisni wbeeten igndnirk kmli nda .snlEie.a,dotci... slkim' th(e ofnorcdnu)e rbicintootun wsa sprsoileneb rfo hte OR of .93 ni eht itsrf ecp.al shiT wsa rdetfruhe tnteroesmadd ithw RO of 6 ni hte eoksioc noeal rpg.uo

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 +1  upvote downvote
submitted by sattanki(82)
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siTh one rhtee wree urof dosd ,trosia eon devrpodi derun eahc leba.t hTe noly oen htat dha na dods toair retgare hatn 10. wsa teh aeltb in het otp htgir (sddO oiatR = 6, I lbi,e)eve chihw wenh yuo olkoed ta het ble,sla led ot hte igrht senaw.r

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submitted by famylife(110)
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A"n dsdo riota of 1 indtciase taht the incodiotn ro eenvt neudr yutds is qeaylul ykeill ot uorcc ni thbo orupsg. An dsod iorat eatrerg nath 1 isitcdnea that hte toocnndii or entev si oerm kliely to rcuoc ni eht rtifs gpruo". (spihiOaediki.irngd_sttdi://o/.rwwoak/etp)

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submitted by xw1984(8)
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ehT RO ni eth eppur ftle 22 tabel is ,cceonrirt cihhw dhsluo be 6 7(2362*6/ =6,) tno .1 hisT mnsae eth OR of eta" okesoci" deso tno hcagne featr stcoaaintfitri by "nkdra i,klm" os kdnra" lkm"i is otn a do,nfrnoceu adn a"et skoocie" si nedieypndnelt asos w/ HECE u.brektoa

nO het eroht dah,n OR rfo dakn"r km"li gchndea a lto omrf( 9.3 to 1)0,. chihw eiisdtnac ran"dk "ikml tihgm be a noorneufcd ,adn ,hoerfetre si otn ennpndlieydte asso /w EEcH okbeut.ar

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 +0  upvote downvote
submitted by an_improved_me(91)
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A nistqeou i rmeo elalynreg evah ..is.

Is it sbioeslp hatt hnwe uyo ttyaifrs teh atda, .e(i. mcgnpoira eht eecftf hatt anegit osiokce ,sha in leoppe hwo dnrik kmil ro epepol ohw do ont nikrd mk)li htta eth dosd toair lwil hwso siifnicgecan ofr oen utb tno the ohetr?

adSi neilfyt,edfr ni het axmlpee ob,ave udolc aniegt kceoios in loppee ohw nrikd kmil leda ot a ifainnsctgi eerniacs eth sikr fo oentinfi,c tbu otn ni oeplpe how hwo dt'ind rdkni kml?i

Ie'v loodek arnudo in shit mmeonct re,dtah and hvae eesn ppeole metionn the retm cft"eef dointai"cifmo; is thta wtha my eemplxa oevba ouwld w?ohs

nI erhto o,dswr fi tnieag ckosioe + kiigdrnn kilm elsda to a ingtnasicfi k,ris utb tgiean ociskeo + tno rndigkni lmki ash no cadisesota i,krs wduol atht amen that eth likm has an cteff"e niooidac"itmf no eht iksr fo egtignt ontncfiei ni pleepo how ate oc?eosik

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submitted by unknown001(9)
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tshi is a snbuo equst.ion

ehwn odsd ritao is 1, gamienn on so,tinacosia

dsdo ag&torit; ,1 hihwc ni iths uneitosq si 6, nmsea cosaiatsoin

hewre is odsd toira ? a) at the eta okooicieddtn- dnkir mkil m.onulc heenc hte enr,swa nlyo iockeo dlpnieeenydtn ssa. ihtw e coli

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 +0  upvote downvote
submitted by tyrionwill(22)
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we can aekm nsghti mpslie eikl sthi yfiaw : ew twan to wnok herewth or1,X X2 tsrrleocae Y, we jsut tselyaaper test X1 nad Y, and 2X adn Y cgyiaodlrcn. hen W ttes X1 whit Y, we qreiuer on X2 x;oeeupsr n Whe stet 2X thwi Y, ew reeiruq on 1X exprues;o

We tets ocekio hitw aid,rraeh enwh iklm was otn rudnk p(ot it:h)rg otpsivie eW tset kiml iwht a,reahidr hewn no iokoec was natee wrleo( it):hgr tiegvane

ononcl:usci yoln koeico ectlresrao ot het aerhiard

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submitted by lilmonkey(63)
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ehT dyework si cDYaisEPs"ED.dT"oaNtNLE)N(Ie hhiWc ni unahm galngaue amnse OTN" A"CEO.ISASTD

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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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