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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 oetisunq smeak me nawt ot tae an e iloc coekio dna pheo i eldbe uot

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caitlyncloy  pcki C adn vmeo no swa ym yraegstt :P hepl lol +2
thegooddoctor2  llo godo eno +1
sparta  OLL ntahk uyo ofr this otcnmme +


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 +15  upvote downvote
submitted by doodimoodi(74)
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Ddi on eno icetno htta hte dOds aroti no het pot lfet is rnogw? mA I ismnsig gs?nmoiteh fI oyu claulctea i,t ts'i 6 stuj keli het pto igrth n...o.e

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mjmejora  shtta tylaaulc eylarl nnyfu +
yex  ecuseBa I dasi s,o ialspep er.h.e. -/: +1
doodimoodi  taCn iveeelb ew yap 6$0 for isht pacr +50
aisel1787  sbet oetmmnc dooidooi)md +1
b1ackcoffee  hatt uncigkf wthre me ffo on xem.a I saw elik si rhtee na fetefc fomioiatdinc by oN"t kingrdin i.l"mk eth !kfuc +2


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 +8  upvote downvote
submitted by sne(59)
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RO &1;tg diiscatne eerdansic cceenurrco of e.netv The olyn OR etergra nhta 1 wsa in teh lbeat that nteciidad atht eht bjseuct aet oesicok btu i'tdnd kdinr km.li h,suT atht si eht yonl eno htiw a iigficsnnta ncreocrecu

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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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roF opelep hwo lanyreleg ahd rtubeol geinrda eth otw scrh:ta

sirFt cath:r We aeptrdaes the tnerei nautpioopl niot owt laslmre piulntooasp to test ofr eht ikseooc ecat.ff In uotpPanoil A (arndk lmki) reeth swa na dods raito fo 6 poty( in the calaut )h.ctra nI oontiuPapl B did( nto kdirn k)lmi eehtr aws an sddo ortia of 6. ceniS het dsdo soitra ear nto 1, ew acn codunelc ttah eht sokceoi have na cfefet esrdaslrge fo hte nutiapolpo ie( ndrka limk epeolp erusvs 'nditd inkdr mlik .l)eopep

cdSone ra:htc wNe tes of puoiatnslop ot test for hte ffteec of kl.mi nI aiPplotnuo C ae(t coesi)ko eehtr wsa na sddo itoar fo .1 nI noautiPlpo D did( otn tea skc)eoio eehtr asw lsoa an ddso aoirt fo 1. hTis asenm htta kiml did ont haev an ceetff evre dna 'idtdn rnuiebttco ot eth assede.i

yn"Ol okeoisc rae eedlityndenpn tdceioassa htiw .E oilc s"seca aenms tath onyl teh osiokce aesuc eth esiasde twotiuh the tfsefce of signmtoeh e.sel

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 +7  upvote downvote
submitted by pg32(218)
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The fact ttah eht osdd roiat in eht pot tlfe is ctnrcreoi emsak hist tqnsuoei vrye .itcliffdu It eaksm ti aperap sa if teh ookesic rae esuacavti tub eht kilm hda semo teeitpcvro carf.ot oS b.osniouox

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drpatinoire  oGd I uohthgt latloty teh ames ywa as ouy id.d I rsetad ta thsi stiuqnoe rfo ta lstae 5min dna adesk lsmfey a'whts wgron tiwh my icss.iattts +1


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 +7  upvote downvote
submitted by youssefa(162)
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llyiIitna mkli rnnigdki aws iaasotsced itwh ciEol. rbtaeouk wthi R.=O93 nad .0t0;01P&l .c.tS(gfnn.i)iia etrfA iiocftasitrtna noit aet csikoeo nda did ton eat icsoeok OR bmceea 1 editsna of 3.9 nigamne hte niscataoosi reaipps.daed oTerreh,fe gaeint esokcoi was a nefrdoucon adn trhee is no lear onoaissaitc netwebe nrgdnkii mlki dna cEil,atesi.od.n... mi'lks he(t deonunf)roc tncionurtbio was olnsiseerbp fro het OR fo 9.3 ni het stirf pa.elc sTih aws uedrrtfeh eodtrtemnasd hwit OR fo 6 in eth cekoois oanle gupo.r

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 +1  upvote downvote
submitted by sattanki(82)
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Tsih one etrhe reew fruo dsod is,otar neo idrdpove drenu each .abtle eTh nlyo eno htta dah na osdd iroat rtreeag ntah 01. saw the betal in hte tpo gtrhi (dsdO Riota = 6, I i)veeb,le ihwhc whne uoy keldoo at hte e,bllas eld to eth rtgih .wseran

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 +1  upvote downvote
submitted by famylife(110)
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A"n sodd orati fo 1 iacitdnse htta hte oitnncodi ro vente nduer ydsut is uaqlyel ellkyi ot ccrou in obht uopg.sr nA dosd artoi eaertrg hant 1 naeidtcsi ttah hte nocnitido ro event is mreo likyle to rcuoc in eht sfirt gr.puo" (kdsihdia/r/atiwingte.i_//:owt.episOordkp)

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 +1  upvote downvote
submitted by xw1984(8)
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ehT OR ni het eppur lfet 22 leatb si otircncr,e hhiwc dlouhs be 6 (27662/*3 6=,) not .1 ishT nsaem teh RO fo te"a o"eokics dose ont gencah afrte iatotiiscrfatn by nr"kda mi,k"l so rdank" k"iml si nto a foo,necnudr nda te"a soio"cek si endlpeidtynen ossa /w EECH ubak.oter

On hte troeh hdan, RO for dark"n l"mik enhadcg a tol or(mf .39 to 1.0,) whhic ntidasice kdar"n kim"l imhtg eb a edufnooncr nd,a ftrorehee, si ont ydnieneltedpn oass /w EcEH rotub.ake

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 +0  upvote downvote
submitted by an_improved_me(91)
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A tsnueqoi i rmeo eglaleyrn veha .s..i

Is ti ioepslbs ttah nwhe yuo rastifty eth ada,t ei.(. mpnaogirc het cfeetf ttha iantge eisoock a,sh in epleop woh knrdi kiml or eleppo hwo od otn irndk )lmik ahtt het odds tiaor lliw wohs gesfnnicaici orf neo btu ont the e?troh

dSia enldfytfre,i in eth lpemxae a,evbo olucd geinta ikoesco ni peeplo owh dirkn limk adel ot a iinftsingac nriseaec hte kris of inif,eonct tbu not in peoepl hwo owh t'dndi inrkd milk?

v'eI doeokl unroad in sith ntommce edrh,at and vaeh ense oepple itmenon eht mter ceet"ff di"oitinm;faco si atth tawh my xpmalee bavoe ldouw ?oswh

nI oreth wsr,do fi neiagt oockeis + nrigkidn imlk elads ot a sanifcigint ir,ks but eganti koosice + ton dignnrik ikml hsa on sdaitaseoc ,kris dowul atht mnea atth eht klmi hsa an "fctfee ntcidoaio"ifm no teh kris of tgniteg teiniocfn in poeple how eat k?ecioos

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 +0  upvote downvote
submitted by unknown001(9)
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htsi si a ounbs i.sntuqeo

hewn dsdo toiar is ,1 niemnga no ,ctsiaaisono

odsd t;t&iraog ,1 iwchh ni ihst etqnsiuo is 6, sname sisaoiconat

rwhee is dosd ortia ? )a at eht tea tnkdco-eooiid rkind lkim onclum. cehne eht sawenr, oyln coeoki ndpneeeidylnt sa.s whti e loci

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 +0  upvote downvote
submitted by tyrionwill(22)
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we anc mkae higstn ipmles ilke siht af :wyi ew antw ot nkow hhreetw Xr,1o 2X scalertreo Y, we jsut strlepaaye tset X1 nda Y, dna 2X dna Y ncrcyoigd.la h nWe estt 1X wiht Y, we rqueire no X2 ;opeeursx nWeh ttes X2 iwht Y, ew uriqeer on X1 poeser;ux

eW tste koiceo wthi ,idreahra ewhn imlk swa ont rnukd ot(p :ih)trg ipsieovt eW stte ilkm hwit area,hrid hewn on eocoki asw teane l(oewr gtr:ih) taeniveg

onnusicloc: olny eckoio eeoarstlrc ot hte ahderair

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 -5  upvote downvote
submitted by lilmonkey(63)
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ehT wrdyeko is cNE"Esi.oDNestLEY()dIPa"TDNa Whchi in uhnam neglaagu amens "NOT "OSDCS.ATAEI

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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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