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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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tshi utnieqso aemsk me anwt ot eat na e iclo oeicok dan ohep i elbed uto

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caitlyncloy  pkci C dna ovem no saw ym esyarttg :P elhp lol +2
thegooddoctor2  oll good neo +1
sparta  LOL tknah uyo fro tish mmeotcn +


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 +15  upvote downvote
submitted by doodimoodi(74)
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Did on eon icoent htta the Osdd triao no eth top eflt is wog?nr mA I gmsnisi hinteso?mg If uyo ltceluaac i,t 'sti 6 sutj klie hte pot trigh .one...

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mjmejora  thast uyalctal ylrlae uynfn +
yex  cueBaes I iasd ,so ieplasp .ere..h :/- +1
doodimoodi  tCna vbileee we pya 6$0 orf htis rcpa +50
aisel1787  sbet momtecn ddoi)moodio +1
b1ackcoffee  ttha kuingcf rthwe me fof on x.aem I wsa liek is erhet an fefect cnoioaimfdti by t"oN igknidrn im.lk" eth !ufkc +2


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 +8  upvote downvote
submitted by sne(59)
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RO ;&g1t iiaecdnts dearcsien ocececnurr fo nevte. eTh olny OR geraetr nath 1 aws ni hte lebat that naideitcd atth the bjctuse aet cosoeki tbu tind'd kdirn ilk.m uTs,h tath is teh lnoy oen itwh a ngcifiianst rceerucnco

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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 elpepo who yerellagn had bretulo rndgaie eth wot ths:car

tFirs tah:rc eW adsepaert the etiern apinotlpuo niot wto lalesrm siaolpnpout ot etst ofr hte kocseoi ta.ffec In taPlouinpo A (arndk klim) hreet swa na dsdo otair of 6 op(ty ni teh atlacu rc)aht. nI luoitonpPa B d(di otn nrdki mi)lk ereth wsa na sodd otair fo 6. nSeci eht ddso atsoir rae ont 1, ew nca oencdlcu taht eth ocoeiks hvae an eteffc asreegdsrl fo het aopinpotul i(e dknra kmli elppoe evussr d'idnt kdrni mlki eplp).eo

Scoedn trh:ca wNe set of toupiolspan ot stte orf eth feftec of milk. In oplPtinoau C ae(t oioe)cks eethr swa na osdd ritoa of .1 nI Polapoinut D (idd otn eat so)okice rethe was oals na osdd roita fo .1 Tsih eanms htat lkim idd ton heva an eceftf eerv dan d'dtni tebunrotic to teh iesdesa.

Onl"y ocseiok ear ytpelddnnenei acisodstae hiwt E. lcio aecss" samen ttha lnoy eht ksceoio ceaus teh sseidea utoihwt eth ectfesf fo seghmnito l.ees

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 +7  upvote downvote
submitted by pg32(218)
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ehT ctfa htat the odsd otria ni het opt tfel si ceroirnct smkea stih eiqontus yerv cfii.uldtf tI msake ti pparae sa if the okoscie aer cauvtisae tbu teh kilm hda smoe teipcrtove ra.ctof oS o.usixnboo

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drpatinoire  Gdo I hthgtuo lattyol hte smea ywa sa ouy idd. I asetrd at tsih siqetonu rfo at esalt n5im and sadek lmysef swhta' nworg ihwt my tsctt.saisi +1


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 +7  upvote downvote
submitted by youssefa(162)
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iIltalyni klim nrngidik was tsaiaedosc tihw lcE.oi rakueobt htiw OR3=9. nad ;&0t.0P01l .S.nng(i)tcfiai. teAfr atoifnatricsit nito tea sokoice and did otn eat eioksco RO eecmba 1 ansitde of 9.3 minngea the oastciinaso eddpapasri.e rTeer,feoh tegina kicsoeo was a uoecrnofnd adn eehtr is no eral stooaiaiscn tewbeen ninrdkig kmil dan lci.a.e,..n.stidoE m'sikl (het ondfon)eurc ibrocntinuot aws spriobelsen for eth RO of 93. in eth ritfs alp.ce Tsih asw fehtdrrue tdeasmtnoedr wtih OR of 6 in teh sioeock aleon .ogrpu

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 +1  upvote downvote
submitted by sattanki(82)
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ihTs one erhte rwee urof sddo tris,ao eon rdidpeov rednu aceh l.eatb Teh lony noe hatt dha na sdod orita eartegr hant .01 saw eht letba ni teh tpo irgth (ddsO oaRti = 6, I )ivebele, hcihw when you doeklo ta eth lble,sa dle ot eht ihgtr .nsewar

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 +1  upvote downvote
submitted by famylife(110)
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An" sddo roiat fo 1 cidstiena atht teh noidionct ro venet ndrue sudyt si qlaylue leylki to occru in hobt g.srupo nA dosd ortia eragret ahtn 1 dcaiitens ahtt teh ioctondni ro tenev si eomr iyllek ot rucoc in hte iftrs ".group (h.ipptwokni:rwkta/i/iOdro_agid/ie/sds.et)

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 +1  upvote downvote
submitted by xw1984(8)
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hTe OR ni het ppure lfet 22 baetl is nctoie,rcr wcihh suohdl be 6 (726*62/3 =,)6 nto 1. ihsT nesma eth RO of "eta okeocis" oeds tno ehacng tarfe icnotitairsfta yb kad"nr "lki,m os ndark" "klmi is tno a u,ndcofnore nad t"ae k"soceio is endtinelypnde asos /w EECH .uaotbekr

nO teh rohet anhd, OR ofr d"rank kim"l hcngdae a olt (mfro 39. ot ,10.) hhwci incdtesia rnk"ad kiml" gmtih be a cfeodunrno ,nad roeee,rfth is otn denetdipynnle soas /w cEEH eou.kbtar

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 +0  upvote downvote
submitted by an_improved_me(91)
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A uontesqi i oerm rlagenely vhae .i..s

Is ti eoslbisp atht nweh uyo ttaryifs eht ,adta ..ei( gmporcnai eth tefecf htta aetign ocsioek h,as in lepope owh kirdn mlki or opelpe who od tno rdikn mlik) tath eht dsdo ritao lilw oswh eiaccnfingis orf oen ubt not het t?hore

dSia e,fyntdferli in eht xmaleep av,ebo uolcd etgani oioceks ni eleopp owh irkdn lkim dale to a sicgatifnni caseneri eht srik of n,tfeoicin but ont in eploep owh who n'ddit rndik ki?ml

vIe' edolko arduon ni tshi ntcemmo ehatrd, nad hvae enes lpoeep meonnit eth ertm cff"ete ;imnofa"ocidti is htat awth ym leapemx ovbae wlduo sowh?

nI ethor r,wsdo fi gnaeit ckiseoo + indkingr limk lased to a nitcgianfsi ks,ir but tnegai oikcose + not rigindkn imkl ash on sastedacio iksr, ouldw htta name ttha the mkil has na etecf"f aotocmii"ifdn on eth krsi of enigttg icoftinne ni eoeppl woh tae oocske?i

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 +0  upvote downvote
submitted by unknown001(9)
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tish is a nbosu qoie.utsn

enwh ddos orati si 1, negamin no sctaaoi,isno

odds tgto;&rai 1, wihch in sith oeusqnit si 6, easmn iassotaonic

eherw is dods taior ? )a ta hte ate ioiodotcdnek- dknir kilm .umconl ceneh hte n,raesw oyln ecikoo idelyndnenetp as.s wiht e ocil

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 +0  upvote downvote
submitted by tyrionwill(22)
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ew nac mkea hnigst spmeli ilke ihts ai:fwy we atnw to onkw weherth rX,o1 X2 teesorcalr ,Y we jsut rletaaypse etst 1X nda Y, dan X2 nda Y locrcia.gnyd nWeh sett X1 tiwh Y, we rqureei on X2 epesu;oxr nh eW test 2X ithw ,Y ew eiuqrre on 1X eers;uxpo

We stet eicoko htwi araherdi, enwh iklm was not runkd (pot tgh):ir vpsiiote eW tets imkl htiw ih,daarer hnwe no ceikoo was atnee welo(r :tri)hg tegveian

:nnooscliuc nylo kocieo rcsaetlero ot teh erdiarha

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 -5  upvote downvote
submitted by lilmonkey(63)
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Teh ykdrweo si coDDedEEY.tNis"EaasTNPL)N"I( hWhci ni unamh agngleau enmas ONT" SSTEC.ADO"AI

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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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