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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 oqenuist mkaes em nwat to ate an e olic eiokoc nda peoh i leedb tuo

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caitlyncloy  ikcp C nda vome no swa ym ysergatt :P phle oll +2
thegooddoctor2  lol gdoo eon +1
sparta  LLO thakn you fro ihst cnmotme +


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 +15  upvote downvote
submitted by doodimoodi(74)
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diD no oen eocint taht eht dOsd itroa no het pto tfel si go?nrw Am I siisgnm egt?nmohsi fI ouy ucatclale ,it i'ts 6 tsuj iekl het top htgir n.e..o.

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mjmejora  tstha ltaacyul lreyla ynufn +
yex  eBaeucs I sdia o,s pispela r.eh.e. :-/ +1
doodimoodi  ntaC beleiev ew ypa 6$0 rfo itsh capr +50
aisel1787  sbet nectmom oi)dooimodd +1
b1ackcoffee  that ngkifuc hwtre me ffo on .exam I wsa ilke is tehre na ctfeef oniiimatocdf yb oN"t nndiikrg .ikml" eth kf!cu +2


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 +8  upvote downvote
submitted by sne(59)
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OR tg;1& sniaedict isdeenrac urcenorcec of .neetv heT onyl RO tgeaerr ahnt 1 aws ni het laetb atth idaitecdn tath hte jtcubes aet osoceki btu dd'tni dnkri ki.ml Tsh,u htat is hte lnyo eon iwht a fictainnisg ccurceoenr

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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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oFr epople who egnlalrey ahd berltou iaengrd hte tow tcr:sha

srFti ctahr: We atareepds teh tirene polpntioau onti tow elsmalr tiaolpspuno ot estt ofr eht oksocie .feafct nI anuPipolot A (anrkd il)mk theer aws na sddo raoti of 6 ot(yp ni hte uaactl cah)rt. In ounltaiPpo B (ddi ont ikdrn ilm)k rethe saw na sdod oaitr of .6 Scien teh dods oritas rea otn 1, ew nca coeudncl ttha het cekoiso have na tceffe earsdsgrel of the tolappniuo ei( rdnka ilkm ppeoel sruves 'ddtni kidnr imlk )l.peeop

eoScdn acrh:t Nwe est of ioapnsptuol ot tset ofr het tffcee of lkmi. In toplniPoua C tae( )ckooeis heter wsa an dosd oiart of 1. nI olauPptnio D d(di otn tea okioce)s theer was olsa na osdd orita of .1 hisT snmae thta ikml idd nto evha an eetcff reve nad dti'dn ucrioenttb ot eht esi.dase

"lnyO sceoiko rae eldenetnyinpd scaaedtsio whit E. ocli a"essc aemns ttha yonl eth eoicoks sceua het dieessa withuto het sfetcfe of ntgsmhioe esel.

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 +7  upvote downvote
submitted by pg32(218)
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ehT ctfa htta eht odds itroa ni the opt fetl si cerntciro esamk isth nuqestio eryv u.difflcti tI mkaes ti eappra sa fi hte sikocoe era saveictua but het imkl ahd soem vetcepiotr cr.otfa So niusox.obo

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drpatinoire  odG I tuoghht ltyatol het msae ayw as uoy ddi. I eadstr at isht sneiqtou fro ta etasl nim5 and aesdk leyfms whsta' nrogw ithw ym ci.tstssiat +1


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 +7  upvote downvote
submitted by youssefa(162)
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Iilltniya klim ignidnkr saw tdaiceosas ithw cio.lE eoutkbra ihtw O=93R. dna 1P.00t0l;& ni.tSi(.fng)cia. rfAet iaainotcrstift iotn ate kicoeos dan ddi ont aet oskeico OR eecmba 1 idestan fo 39. angneim eht noaiaosistc ipdsaard.pee ,oTeererhf iatneg eosoikc asw a doonefrucn dna terhe si no aerl siotasaiocn ebtween dgnkirin milk nad .dsa.o.,.eEnltci.i 'lsmki (hte orun)dncefo iobcttunirno wsa sbpeoselirn for eth RO fo .39 ni het irtfs lce.ap sihT saw urrehfdet otdmseeadrnt whit OR fo 6 ni the eioskoc ealon gro.pu

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 +1  upvote downvote
submitted by sattanki(82)
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This neo hteer wree oufr odsd ,aisrot eon idevrdop renud each eltb.a heT nyol eno hatt dha an dsdo atiro aeergrt nhta 0.1 saw hte abetl ni the top irght (ddOs aotiR = 6, I v)beelei, hhwic whne you dkoloe at the l,alebs eld ot the hgitr wr.anes

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 +1  upvote downvote
submitted by famylife(110)
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n"A dsdo otair of 1 scetnidia tath teh onictindo ro envet urden ydstu si lalqyeu elliky ot coucr in hbto .pourgs An odsd toair ratgeer tanh 1 dasietcin ttah hte cionointd or vetne is eomr yilelk to oucrc ni the frsti "o.rpgu (/t:dsiwer/pitnoiigpsrh/ktkdo_aa/dw.i.ieO)

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 +1  upvote downvote
submitted by xw1984(8)
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heT OR in the rppeu elft 22 bltae is rtr,cincoe hwhic ulsohd be 6 27(/*3662 ,=6) ton .1 ihsT msane teh OR fo aet" okio"ces deos otn hnaceg aeftr tosatitiniafrc by "akdrn lmk"i, so anrdk" i"lkm is ont a nrueo,ocnfd nda "eta oois"eck is linteeddenpny oass /w HECE t.karoeub

nO hte hoter h,dna RO for drn"ak "klmi gdanceh a otl ofr(m .93 to ),01. chwhi ticaeinds akn"rd klmi" gihmt be a ceorfuodnn an,d eoer,hretf is tno eipytlndenedn ssoa w/ EcEH u.orbakte

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 +0  upvote downvote
submitted by an_improved_me(91)
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A estiuoqn i erom yeenrlgal evah ...is

sI it lospbise thta nhwe you taftiysr het t,aad i.(.e pgmoniarc the fcetfe that eaignt ikesoco sha, in eppoel how dkrni kmil ro poleep woh do otn rnikd im)lk atht eth odds rtaio lwli ohsw igafennsciic rfo eno tub otn het rteho?

adiS ft,ryelndfei in teh apmlexe eba,ov dcuol getani kooscie ni poepel ohw rdnki milk elda to a scnaitingif rseeiacn het ikrs fo nioiftecn, tbu otn ni oppele ohw hwo 'dnidt rdink ilmk?

'Iev dokelo aroudn ni shti ctmmnoe drah,te nda veha ense loppee moeintn the rtem feceft" nioiad;mtfoic" si atht hawt ym xpeaeml aevob dwoul wsoh?

nI treho dwors, fi eaigtn iocokes + nirdnkig limk selda ot a nngiacsitfi ri,ks tub ingate isecook + ont igrnikdn mkil sah no disseatcao ris,k wodul htta nmae atht teh klmi sah an ee"tffc oomid"tfiican on the kris of nitetgg iencnitof in ppleeo woh ate ceiokso?

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 +0  upvote downvote
submitted by unknown001(9)
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tsih si a bouns setniou.q

hwen sdod atoir is 1, mnaegni no ist,naooiasc

sddo gt&arit;o 1, hhwci ni hits eouqtnsi is 6, mnesa issacnotaoi

hwere si odds rotai ? a) at eth aet -otoidcinoekd rdikn klmi olc.num eechn eth nrs,eaw onyl ooikec npnneyelddtei sa.s htwi e loic

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 +0  upvote downvote
submitted by tyrionwill(22)
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ew anc keam ishgnt mepils elik hits yai wf: ew anwt ot ownk rhtheew 1o,Xr 2X arrscltoee Y, ew jtsu tyslepaaer estt X1 nad Y, dna 2X nda Y gocy.raldnic hWn e ttes 1X tiwh Y, ew reiqeru no X2 uxorsep;e hn We ttes 2X hwit Y, ew eerruqi no X1 oxerpeus;

We stte ooecik ithw rhriead,a wneh mlik swa ton nrduk top( rgiht): peovisit We sett ilkm ihtw rre,ahiad ehnw no ooiekc was neaet e(rowl r)i:thg ganeitev

nlsi:occuon lony keocoi osacrreetl ot eth eaiahrdr

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 -5  upvote downvote
submitted by lilmonkey(63)
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hTe wedykro is EYE)PNaeiDt("sDcNaId.T"osNEL Which ni anuhm agnlugae amnes "TON SOEADTS"AIC.

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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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