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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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itsh euosnqti mksea me nwta to ate an e iloc kooeic nad ehop i ledeb tuo

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caitlyncloy  icpk C dna eomv no swa ym segyttar P: lehp llo +2
thegooddoctor2  llo oogd one +1
sparta  LOL hktna uoy fro hsit mtoencm +


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 +15  upvote downvote
submitted by doodimoodi(74)
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iDd on oen inteco that hte sOdd ortia on teh otp letf is gwon?r Am I ssmigin ?emohgitsn If oyu accutllae it, 'sti 6 tusj like het opt hgrti .o.en..

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mjmejora  thast uatalylc aylelr unynf +
yex  ceeaBus I aids s,o selappi ..rh.ee /-: +1
doodimoodi  tanC eeveibl we pya $60 ofr tshi cpar +50
aisel1787  steb tnemcmo )odomiodoid +1
b1ackcoffee  htat fciugnk terhw em off no xmea. I was ilek is hrtee na ftfeec oidicoimtnfa yb N"to irindgnk m"kli. hte !ufck +2


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 +8  upvote downvote
submitted by sne(59)
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OR &;1gt tsicenaid nedesirca cnrecrcueo fo vet.ne eTh oyln RO gaeertr tnha 1 was in the laebt ttha tdenicadi taht eht ebujstc tea ckoieos btu i'tdnd inkdr ki.ml Tuh,s ttah si the onyl neo whti a gtifiannics crceucorne

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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 eeoplp how yagelnelr had eobutrl nrgeida teh wot c:sthar

triFs crh:ta We deesaatpr teh reteni lpauonpiot itno otw leasrlm anluitoopps to estt fro het oeciosk ffea.tc In Pupolntioa A ardkn( k)ilm trehe swa an dsdo taoir of 6 opyt( in hte lctaau .rc)aht nI Poultnioap B i(dd ton kndri i)mkl terhe saw an dsod oarti of .6 cnSei het ddso irsoat rea ont ,1 ew can cdnlceou ttha het skecoio eahv na tefecf ergeldsars of eth aniuopptlo ei( nkrad ikml oppele uvssre t'nidd drkin lkim lop).pee

edSocn rc:tah weN tse fo pilouopatns ot etst rfo the ceefft of l.mik nI unlaotpoiP C t(ea ck)oseio rtehe was an ddso taori fo 1. nI naPtioloup D i(dd nto ate oskceoi) herte wsa aols na sdod ratio fo 1. ihTs nesam thta klmi idd tno heav na fteefc rvee nad ndd'ti orceutintb ot teh siedsa.e

Oly"n oskioec ear deneyneitlndp acsdsaoite hwti E. coli "caess asemn htat lnoy teh ioeskco cusea hte eeadsis tuowtih hte cefesft of heonmgits .slee

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 +7  upvote downvote
submitted by pg32(218)
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eTh fcta ttha eth ddos aroti ni eth pto etlf is crnrtieco saemk sith setquion yver iffdiltc.u tI mksae it pparae as if hte seociok rea aivacsetu btu eth ikml dah emso ttcivreoep tcrao.f So oiounxso.b

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drpatinoire  oGd I ttohuhg toallty teh smae ywa sa you di.d I tearsd ta siht neuoqits rfo ta sleta 5nim dan sdkea fmlsey wahts' rnwog whti my tstti.isacs +1


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 +7  upvote downvote
submitted by youssefa(162)
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nIitillay mikl rgkndnii was oiasdaetcs iwth c.lioE ubertkao iwth 9R=.3O nda l0;0&0t1.P n.(S.igtfac)in.i tefrA iisoitntaacfrt nito eat eoksoci adn idd ton aet csookei RO macbee 1 tnseida of 9.3 enminga hte aitssaoonci dei.asarpped ,Tfhrereoe gentia ieokcso asw a uernondcof and herte si on lrea otsaisoacni ewtnebe nkndirig limk nda a..d,..toEisecnli. skm'il (eth unnoecr)fdo citnorobnitu saw nbrlesospie for eth OR of 39. ni eth tfisr calep. Tihs wsa rftrhduee tdteemdorsan tiwh RO of 6 ni teh sekcoio naleo .gprou

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 +1  upvote downvote
submitted by sattanki(82)
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ihTs neo htree wree orfu dosd aio,rst noe vipdedor duenr ehac .ltbea hTe only oen atth dha an dosd irota rergaet ahtn 10. asw teh abtel ni eth pot gtrhi (ddOs aRoit = 6, I eilv),ebe hichw ehnw uoy oeldok ta het ebasl,l eld ot het ghitr eras.wn

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 +1  upvote downvote
submitted by famylife(110)
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"nA sodd oirat of 1 icnitsead ahtt teh onnditioc ro tvnee ednru sdyut is eallqyu liekly to ccrou in tbho gr.spuo An sodd troia tgarere ntha 1 tiaeicsdn atht teh ontdnioic or entev si mero kileyl ot ccruo ni eht tfris .rpu"go (swg/ads/tai:ipin.kt/piok_rwieO/idthoer.d)

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 +1  upvote downvote
submitted by xw1984(8)
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The OR in eth purep tfle 22 aeblt si ncictr,eor ihhwc odhslu eb 6 72(*/2366 )=6, not .1 sihT aesnm hte RO fo "tea eko"osic seod ont cghane faert aiitraoticntsf by anr"dk ,im"kl os nkrad" l"ikm si tno a ndnro,cefou dna a"et kiooec"s si letnienydpden osas w/ CHEE reboka.tu

nO eth reoht ,anhd OR ofr r"kdan "mkil edchagn a lot f(omr .39 ot 1,).0 ichwh ideinacts ndk"ra mi"kl htgim be a ufredoconn dan, eeh,erotrf is tno ndnedlpnytiee asos w/ EcEH baeoutrk.

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 +0  upvote downvote
submitted by an_improved_me(91)
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A snuetioq i mreo erelnlagy vhea .i.s.

sI ti epilssob that ewhn uoy itfyrsta eth taad, .e(i. pcmnrigoa teh etceff that aientg csokioe ,sah ni olepep hwo nikrd milk ro eelpop hwo do nto ikrnd km)il atht eth odds taori lwil hsow sifcieaincgn rof noe tbu tno eth er?oth

aidS refdtf,enyil in eth epexmal avoe,b lcdou geatni ckiesoo ni peolep who inkdr mikl laed to a agcfintnsii iscenera the srki fo o,nticfine btu nto in epoepl ohw ohw d'nidt rinkd km?li

I'ev loekdo unraod ni tsih tcmemon edtrh,a dna aevh sene ploepe neitonm teh rmte "ftcfee oa;ifontmdii"c si atth wtha ym axmpeel obave wuldo ?hwos

nI oterh rs,dow fi igatne ooceksi + nkdrniig kmli dasel to a ganinsftici s,kri btu tagein osckoei + otn nkidring ilkm sha no diaeosastc sk,ri oludw atth mane tath the klmi sha na tfec"fe iidoinfacot"m on teh ikrs fo gnigtet oneniftic in eplpeo woh tae cesooik?

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 +0  upvote downvote
submitted by unknown001(9)
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hsti si a snoub qsne.tuio

nhwe sdod iator si 1, eagimnn on oc,siastinao

osdd tti&ga;ro 1, hicwh in htis tnoqieus is 6, snaem atisonocias

wereh is dods iotra ? )a ta eht eta oedoki-coidnt nrdki ilmk olmn.cu enhec the na,srwe lyno keoico npnlneedietyd .sas wiht e ilco

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 +0  upvote downvote
submitted by tyrionwill(22)
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we anc mkae tsihng pmisle liek isth aw fyi: ew wnta to onkw ethwerh oX1,r 2X eatocerslr Y, we utsj tsyeaperal sett X1 dna Y, nad 2X and Y glir.cyoandc ehWn stte X1 hwit Y, we ruqreie no 2X eeopx;rus ehW n etts 2X wtih ,Y we eerqiru on 1X eps;oxeru

eW stte kooice thiw draihr,ae enhw lkmi wsa ont dunrk (tpo :t)hrig soivipet e W tets mlik twhi a,hrridea nhew no oeicko asw tneae wlo(er )tgi:hr aneetgvi

oulicns:con oynl eoicko arocelrtse to hte daraerhi

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 -5  upvote downvote
submitted by lilmonkey(63)
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eTh ewyordk si E"PYNtdNcsLD.DaITEas(Ne"Eo)i cWhih ni mnahu uaagglen eamsn N"TO DT.IEOAASCS"

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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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