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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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tish tqsoineu kamse em natw ot ate an e icol eciook dan hoep i deleb tou

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caitlyncloy  pcik C adn emov no saw my ytsraegt P: pehl llo +2
thegooddoctor2  lol odgo eno +1
sparta  OLL ntkha yuo orf shit nmmtcoe +


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 +15  upvote downvote
submitted by doodimoodi(74)
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idD no oen ncoiet thta eht dsOd riato on eth opt left si ngrwo? mA I gnsimsi ?thismengo fI uyo celactlua it, 'tis 6 jsut ilke eht pto rtgih o....en

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mjmejora  tahst ycltluaa reylal fuynn +
yex  Beseuac I disa ,os iaeppsl .r.h.ee -/: +1
doodimoodi  tCna bveelie ew yap 06$ for hist crpa +50
aisel1787  sebt netmocm doo)middooi +1
b1ackcoffee  that kinugcf wrthe em off on .mexa I was klei is rehte na ftcefe mionfotciadi yb Not" nrkgidni km".li teh !ukfc +2


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 +8  upvote downvote
submitted by sne(59)
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RO tg;1& adintcsie nseariedc rconeucrce fo tvene. heT nylo RO rearetg atnh 1 aws ni hte abtel thta dcatediin ttha eht busctje tae esoiock tbu dndti' dikrn m.lik T,uhs that si hte oyln oen whti a nitsgiifcna ucccronere

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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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rFo leopep ohw reylalgen hda lbteuor erdagin teh otw htrasc:

Fsirt rh:act eW readpatse the teirne apnpluotoi oint two lsrlema ootapspnlui to estt for eth kseooci ftac.fe In tipooualPn A rna(kd i)lmk hreet asw na odsd roita of 6 pto(y ni the cuatla a.htrc) nI Potploianu B (idd not dnikr m)kil heetr swa an dsdo toari fo .6 encSi eth ddos trasio ear nto 1, we nac duecnocl ahtt eht cokesoi haev an etefcf sarderlesg of hte ntpiaoluop ei( danrk lkmi epepol vuerss dit'nd knird mkil l).ppeeo

ondeSc :arcth weN tse fo npolupatois ot ttes ofr eth ctffee fo i.mlk In otPinaupol C (aet )ookices teehr swa an dods toria fo 1. In ootaniuplP D did( ton tae )oicskoe eetrh swa aslo na dsdo tiroa of .1 hsTi nseam ahtt lkmi ddi not aevh na fteefc eerv nda d'dtin troecbuitn ot teh ieasse.d

"ynlO ooicesk are ileenntepyndd eacoasitsd htwi .E olci ecass" mnesa htat lony eht coskeoi cusea het esaedis wtotiuh eth scfefte fo hniotemsg e.sle

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 +7  upvote downvote
submitted by pg32(218)
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Teh atcf htta eth ddso oarti ni hte opt ltfe is inecotrrc skmea siht itnsqeuo yvre it.ilcfudf tI meska it pepara sa fi eht cooksie are tuvesciaa but eth lkim ahd omse evteitproc fctora. oS ixoob.onsu

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drpatinoire  odG I ttuhogh otytall the ames way sa ouy did. I tserad at ihts unteisoq for at tesla im5n nad dksae slmyfe tswha' grwno wtih ym tcta.ssiits +1


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 +7  upvote downvote
submitted by youssefa(162)
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aIyiilnlt ikml iindgknr saw tsidoesaca with l.oiEc tubakreo with 9.O3R= dan l00;t&P01. a.)igncfit..Si(n Atfre cttfisntaaroii noti tae osecoki dan ddi ton tea isckoeo RO abmcee 1 naisedt fo 39. nmeagni eth oiaonistcsa d.aspdaperei eTorhe,ref geitna ooskcei was a ocedfnroun and tereh si no ealr asicoitnsoa wteeenb drnniikg limk nad lea.nit.so,d.iE..c iksml' the( ecfdoonnu)r boinoirtunct saw nspsiorebel ofr the RO fo .93 in het sirft lec.ap iTsh was fdteuehrr msartdeodtne iwth RO fo 6 ni teh kooices aenlo rp.ogu

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 +1  upvote downvote
submitted by sattanki(82)
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hsiT one reteh reew urof sodd s,arito one edidvorp nedru cahe tble.a ehT olny eno htat had na odds rtoai reetgra naht .01 asw the telba in teh opt thgir (dsOd Roita = 6, I eb)vleei, ihwhc ewhn ouy eloodk ta the lesl,ba lde to teh ighrt .swenra

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 +1  upvote downvote
submitted by famylife(110)
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"An dosd atori fo 1 sactndeii htta eht onocindti or teevn eurdn utdys si ylqaleu kliley to cuocr ni tohb srpug.o An odds aroti egraert nhat 1 tidieasnc ahtt het tcindonio ro vntee is mero eklyli ot ouccr ni het stirf ou"r.gp (o/sdpttw/.eiwpOstiognki_h/:adaii./edrikr)

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 +1  upvote downvote
submitted by xw1984(8)
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hTe OR in hte reppu tfel 22 belta is ,ctirncroe icwhh lsohud eb 6 27(6/32*6 ,)6= otn .1 hisT anmes the RO fo ta"e oko"sice sedo nto ceahgn tfare oiaartnticsfti yb "akdnr ,"kmil os rdank" mikl" is nto a rcnoedno,uf nad "tea oicoeks" si edelnnyptdnie saos w/ CEHE eka.ubotr

nO hte hreot dh,an OR for dna"kr ik"lm nhcdega a tlo rof(m 39. ot ).,10 ihwhc niitecasd na"rdk ilmk" mgthi be a nooeducrfn da,n eroeheftr, si nto dpeietnldnney saos w/ EEcH kbrteua.o

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 +0  upvote downvote
submitted by an_improved_me(91)
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A iostqune i roem rlglaneey heav ..is.

Is ti spbiolse tath hwen ouy srfittay het tda,a ..i(e mpnioagrc eth cffeet tath taenig sioeock sah, ni eoelpp woh ndkir kmli or poeelp hwo do not irndk imlk) ttha eth dosd iraot lwil shwo nagciecfinis rof neo ubt ont hte rh?teo

aSdi ndeeitl,yfrf in hte epelmxa vbeao, dluoc geitna eskiooc ni poeepl ohw idkrn mkil aled to a fsigincatin asiernec eth srik fo tciifnnoe, btu nto in poeple ohw owh ditn'd rkidn k?lmi

'evI oelokd drauno in hsit tmceomn hd,rtea and aevh nsee poelep ieontnm het temr te"ffec ciatfdio;i"omn si htta htaw my peemalx eobav udlow ows?h

nI roeth owdsr, fi itgaen eskcioo + rdnignki kiml ledsa ot a gninctiiasf rs,ik ubt engtai ceoioks + not nikrdgin lmki ash on eadtiasocs ki,sr uwdol atht nmea htat the lmki hsa na tfee"fc fiitioodam"cn on eth risk of ggientt ceoiftinn in eelopp ohw ate ?kiosoce

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 +0  upvote downvote
submitted by unknown001(9)
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ihts si a snbuo qnsietuo.

hewn osdd oiart si 1, nemiang on aoiasti,osnc

ddos a&itt;rog ,1 hwihc ni iths neuqisto si ,6 smane naaosoctisi

eherw si sodd troai ? )a at eth tea econko-oitdid nkird iklm .ulncmo cneeh the nerw,sa ylno keooic lnendyeidtnpe a.ss tiwh e iclo

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 +0  upvote downvote
submitted by tyrionwill(22)
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we anc maek gtinhs mlepis ielk ihst wyai: f ew anwt ot nwko wthereh rX,o1 X2 ltrecosera Y, ew tjsu spaaelyert estt 1X dna ,Y dna 2X dan Y yrcicdon.gal We nh estt X1 twih ,Y ew riureqe on X2 upoe;rxse neh W tset 2X hiwt Y, ew reqeriu on X1 xpoerseu;

eW etst oioeck tihw d,eraihar hwne mikl wsa ont dkunr o(pt thr:)ig ptosiive We tste mikl hiwt rdearah,i wehn no iekoco aws eanet lerow( ht:)rig eagntevi

nlnuo:cscoi loyn ckoioe tarelrcoes ot eht deriarha

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 -5  upvote downvote
submitted by lilmonkey(63)
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heT yreokwd si "E"LaYDDtiPe(oI)EN.daTsENsNc ihcWh ni amnhu glunaega esman O"TN I.O"TAACSSDE

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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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