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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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hits nqusoeti ekams em ntaw ot tae na e lico kceooi dan ophe i lebed uot

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caitlyncloy  kipc C dan evom no was ym esyttrga P: lhpe oll +2
thegooddoctor2  llo oodg eon +1
sparta  OLL hnatk oyu for isht enocmmt +


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 +15  upvote downvote
submitted by doodimoodi(74)
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iDd on noe otcine that teh dOds tiroa on eht pot ltfe is orw?ng Am I siimgsn notmei?shg If you elcaltuac ti, i'ts 6 ujts iekl eth pot ihrgt ne....o

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mjmejora  thast utllaayc earlly funyn +
yex  Baeuesc I adsi so, salippe .rh..ee :/- +1
doodimoodi  taCn bvieele ew ypa $60 rof thsi racp +50
aisel1787  tesb tncemmo d)moiidodoo +1
b1ackcoffee  thta fkiungc ewthr me ffo no mae.x I aws ilke si eerht na ftfcee niiofdoaimct yb tNo" grndikni mlk."i hte f!uck +2


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 +8  upvote downvote
submitted by sne(59)
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RO g1t;& stadicnei crenasdie ecourccren fo ev.nte eTh olyn OR rgaeret htan 1 was in eht leabt atht dtceidina atht eth ejscbtu eat kcoeois but i'ndtd nikrd ki.ml h,usT ttha is het ynlo oen ihwt a cintafnsgii occreuecrn

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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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orF ppeleo woh lgneeryal ahd lorbetu eradgni the otw rh:csat

Fitrs hrcat: eW darpeesat teh itenre uintlpapoo niot two msreall ptouaplonsi ot etst rof hte ockosie tfafec. In lPupoanito A kr(nda lmki) heert was na ddos taroi of 6 yp(ot ni teh tcaula ta)rhc. nI aolnPopitu B (did nto ndikr m)kil there asw an sodd raito of 6. cnSie teh odds iasrto aer nto ,1 ew nca ndecuolc ahtt het esikcoo evha na eefctf arsgsederl of eth noptlaipuo (ie adrkn imlk peelpo urvsse nditd' rknid likm lo).pepe

cndoSe ac:thr wNe tse of oopipanstlu to tets rof het feceft of i.klm In aPloiotnup C (tea k)esicoo teerh was an odds aotri fo .1 In lupaooPtin D d(id otn eat kecsi)oo tehre swa loas an odds iaort of 1. isTh nmase htta milk did otn ahev na fcefte eerv and 'idndt tretunocib ot het sseidea.

On"yl coiesko aer eeltpendidnyn itdasaesco ithw E. olic sc"ase enasm taht ylno eth eokoisc saceu het siasede oiuwtht the esfefct fo nheiogstm el.es

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 +7  upvote downvote
submitted by pg32(218)
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The catf that teh odds oatri ni het pto tlfe is cteinrrco eskam tihs isqnteou ervy icidfltu.f It eskam ti apreap sa fi het kociose aer eacsuivat tub eht imkl dah emso verittecpo a.tfrco So sbxooo.inu

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drpatinoire  dGo I guthhto attylol het emas awy as ouy ddi. I saretd at ihts uqinteso orf ta tlsae imn5 dna ksade myslef s'twha nrwog hiwt ym tic.tassits +1


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 +7  upvote downvote
submitted by youssefa(162)
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ailnilIty limk ikdngnir asw sstcaeioad hwit c.Eiol tkouerba wiht 39O=R. nda 0t1&l.0P;0 ...(cnftainigiS) fterA tntiaaficosrit iont ate cieksoo nda idd otn eta oekiosc OR meecba 1 desinat of .39 nimgaen eth asaiotonisc depderip.saa oh,efTerre eiatng ooseick was a fnreoudonc adn ehert is no elra osaiaoitcns eewtbne gkdnniir mikl adn E.idlt..,.caon.eis ik'mls eth( rfdn)eoonuc incoutitrbon aws nprsiebeols ofr teh OR fo 93. in hte srift .eapcl ihTs wsa threuedfr tntereasomdd hiwt OR of 6 ni eth ekscoio aoenl pg.our

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 +1  upvote downvote
submitted by sattanki(82)
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Tshi eon reeht erew uorf dsod isaotr, neo oddpervi nedru hcae taelb. hTe yoln oen htta had an dods triao rgtreae htna .01 asw teh batel ni het opt htgir (dsdO atRio = 6, I ei,beel)v hcwih wnhe yuo eolkdo ta het ,ealsbl eld to the hgrti reaws.n

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 +1  upvote downvote
submitted by famylife(110)
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A"n dosd atroi of 1 atdnsiice that the niotcodin ro nvtee rdneu duyst is lluayqe lyikel to orcuc in bhto u.prsog An odds otrai atgerre hatn 1 acsiietdn ttah teh tinocindo or evnet is moer lklyie to ucroc ni eth firts gor"pu. (gk/./aOarieipntsedtwdp/sd.ikiho_oi/wirt:)

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 +1  upvote downvote
submitted by xw1984(8)
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ehT RO in eth prpue tlfe 22 alteb is ci,rnoterc whcih slhdou be 6 (276362*/ ),=6 nto 1. sThi senam eht RO fo "tea ikocos"e dose ont ehcnag atfer sfiirittaaotcn by "kndar mlik", os d"rnak ik"ml si not a rde,nunofoc dna ea"t io"escko si eeydnnndipelt ssao w/ ECEH eruotkba.

nO teh hreto anh,d OR rof rn"dak lk"mi genchad a tol mofr( 93. to ,.10) hciwh netsadiic "dnkra "imkl itgmh be a ernfudncoo na,d er,eethrof si ton ydtlnedpienne ssoa w/ cHEE rtkobe.au

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 +0  upvote downvote
submitted by an_improved_me(91)
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A ouneqist i orme yrnllaege eavh .s.i.

sI ti slpoibes atht nwhe oyu airtyfts the atad, (.e.i nmpaorgci eth ftfeec htat iatneg eooksci ash, ni olpepe how nrdki kilm ro eeppol how do otn ikrnd )lkmi taht eth ddos aitro will hswo fnsceacingii rfo noe tbu nto het oehtr?

adiS nifreftde,ly ni hte amexple vo,bae cdulo ngeait okeoisc in pleoep ohw kdnir kmli dlea ot a ngicfnsitia ercansie teh ksri of itcno,nfie tbu nto in peoepl hwo owh td'nid kidrn l?mki

'evI doloek unador ni sthi mnometc ehdtar, and aveh eens lepoep teimonn teh trme tfec"ef cofnmia;otdi"i si tath ahtw ym maelxep avboe lowud ow?sh

nI ohrte ,owsrd if gaetni ocikseo + grninkid kmil sdela ot a fninstcgiai k,sri tbu aentig sikooce + otn kdnignir ikml sha on daceosaist ir,sk uwold taht enma atht teh iklm ash an t"fefce o"mfniicodiat on teh rksi fo itentgg cnitnfioe ni oelppe ohw tae eook?ics

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 +0  upvote downvote
submitted by unknown001(9)
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stih si a nobsu soientu.q

ewnh ddos aiort is 1, nganeim no nc,aossiiota

osdd t&g;tiroa ,1 whhci ni ihts tsiouenq si ,6 senma onssaiicoat

rewhe is sdod irato ? a) at het eta kocnteoddiio- dinrk ikml un.colm cnehe hte ,neswar ylon ioceko peynenntlidde s.sa itwh e coli

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 +0  upvote downvote
submitted by tyrionwill(22)
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we can aemk hgsnti empsli lkei isth y waf:i we ntwa ot know ehtwerh Xo,1r X2 creetlsaro ,Y ew tusj sterlpaaye test 1X dna ,Y nda X2 nad Y cglindroac.y n hWe estt 1X ihwt ,Y we ruriqee on 2X ox;uesrep nh We etst 2X htwi ,Y ew uerreiq no X1 su;oerepx

eW tset cokeio ihwt i,eahrrad nehw mikl saw ont ndruk (pot g)thri: ovspetii W e tste lkim hwit r,iaedarh hwen no ockeoi aws eaent owr(le tig)r:h giveetan

cnoscluio:n lnoy ikecoo sreeactorl to eth dirareah

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 -5  upvote downvote
submitted by lilmonkey(63)
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The wkyrode is EI(.LT)YEasde"EsPtNDaDNoiNc" chhiW in uhnma ngeagalu esmna ON"T .AOASE"IDTSC

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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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