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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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iths teisounq kmesa em tnwa to ate an e clio ciokoe nad pheo i bleed tuo

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caitlyncloy  pick C and evmo on was my reygtats :P phle lol +2
thegooddoctor2  lol godo noe +1
sparta  OLL khnat oyu ofr thsi tenomcm +


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 +15  upvote downvote
submitted by doodimoodi(74)
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Did no noe oienct htat the Odsd traio no hte opt tfel is r?gnwo mA I nsigmsi tgno?ihmes fI yuo utaaclecl ti, 'sti 6 tsuj ielk hte tpo htgri n.eo...

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mjmejora  ttash ylacutal lylrae fynnu +
yex  seaBuce I sadi ,os iselpap re.e.h. :/- +1
doodimoodi  ntaC ieeebvl we ypa 6$0 orf siht capr +50
aisel1787  btes mmtocen odoiido)odm +1
b1ackcoffee  taht ifuncgk rwthe me fof on emx.a I wsa ilke si ehert na eftfec cifoianmtdio by o"Nt gdknrnii l.mik" teh c!kuf +2


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 +8  upvote downvote
submitted by sne(59)
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RO 1t;g& ceitinasd eierndcsa cunecorcer fo netve. The olyn RO etegrar hnta 1 saw in eht altbe htat tcdediian ttha eht ejbtcus eat keioosc tub i'dndt diknr klim. Tuhs, taht si eht ylon oen wtih a inisfgactni cuccronere

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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 ppoele who lyeneglar adh lbtreou eindarg the tow r:cstha

trisF :atcrh eW arptasede eth reeint lnaptupioo tino otw rlaemsl ntslupooipa to stet fro the oskoice fet.caf In oulaiPpnot A rknd(a )imlk erhet swa an osdd taori fo 6 p(yot in eth atucla a)c.rth nI nopuoaitPl B i(dd tno kdrin mkl)i erthe wsa an ddos oirat of .6 eScni eht sddo aorsit era ton 1, we nac ndeclcuo hatt het ooskeci heav na ftefec gseaerlsdr of eht lopiapntuo ei( nakdr milk eepopl vssuer itnd'd nkdir milk ep).lpoe

ocneSd ra:hct Nwe ste of atluspnpioo ot tste rfo the ecetff of limk. nI Plaotponui C (tae esk)coio ethre wsa an dods riaot fo 1. nI toPnalpuio D idd( ont eat ciooek)s rtehe was oasl na sddo irota of .1 siTh samne atth milk ddi otn eahv na efectf reve nda idtdn' ubeicntort to hte aies.dse

y"nlO coiekos rae dlyeneentnpdi cosistaeda iwht .E ocli ass"ec names that loyn hte ocoieks acesu teh deseisa twtuhoi hte steefcf of etghisonm eles.

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 +7  upvote downvote
submitted by pg32(218)
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The afct hatt the ddos iaort in hte pot ltef si cneicrrto mekas hsti qitnoseu yerv .ficfutldi tI eksma it rpeapa sa fi het kesoioc are cesvtaaiu but teh likm hda moes tvecptreio ctfar.o oS o.nxoobusi

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drpatinoire  Gdo I uthtogh ttaloly het maes awy as yuo ddi. I stader ta sthi tseoiunq rof ta stlae in5m and adkes syemlf atw'sh rnwgo whti my tisstscita. +1


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 +7  upvote downvote
submitted by youssefa(162)
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inIlatyil iklm rkdgiinn asw sacsdatoei hwti .iolEc oaerkbut hwti OR9.3= dan l0.&P100t; nif(i.)ia.cS.tgn tfAer tnaaosrtfiitic toin eat ikoseco nda ddi ont tae cokiose OR bemace 1 aiesdnt of .93 iemanng het intasacioso isddea.erapp rheefT,roe gniaet kcieoos wsa a uncdrenoof and ethre si no arel istsicanoao ewbenet nngdrkii lmik nad .i.csnld,.toaE..ei ks'iml (eth dcfnnuor)oe ribuoincnott wsa rlisenpsoeb for hte RO of 9.3 ni teh sitrf .clape shiT saw dtrurefeh etredntmodsa tihw OR of 6 in the icsooke eoaln opugr.

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 +1  upvote downvote
submitted by sattanki(82)
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shiT one rtehe eewr uofr dods ,oarist eon dpdorevi nuedr caeh b.alet hTe lnoy noe taht dha na sddo taroi etgrear tnha .01 swa teh ebatl ni eth pot gihrt (dOds aotiR = 6, I eil,eevb) hhicw wnhe oyu klooed at the sl,lbae led to het trgih ren.swa

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 +1  upvote downvote
submitted by famylife(110)
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An" ddso ratio fo 1 sianidetc thta the inntoocdi or nveet deunr tysdu is aluqlye leiykl to coucr ni btho ruopgs. nA dods iarto eerargt tnha 1 teaindcis that eth octondnii ro eetvn si meor elykil ot rcuco ni het sritf .pgu"or (rkdtiOakip:p.ah/wsieeinittdiw//sdg_o.or/)

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 +1  upvote downvote
submitted by xw1984(8)
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heT RO in eth epupr ftle 22 abelt is eiontrrcc, ihwhc shldou eb 6 (723/26*6 ,6=) nto 1. sTih maens hte OR of eat" oeskioc" oesd ont nhagce trfea atnctsitrofaii by r"knad m,ilk" so "rdnak kli"m is ton a ,fndonuorec dna "tae ceok"ios si lependenidytn sosa w/ EHCE ktu.earob

nO teh throe nhad, RO orf rn"dak "mlik cgdaenh a olt (morf 3.9 ot 0.1), hwcih iisntedac akndr" imkl" itmhg be a onuenfocdr dan, e,oreretfh si otn dpdetyeinennl saos /w HcEE akuob.tre

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 +0  upvote downvote
submitted by an_improved_me(91)
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A suqtineo i orem nagllerey veha is...

Is ti soisebpl ttha hnew ouy raifytst hte tada, (i.e. arpgcomni eht eectff tath tniega oieocsk h,sa ni leepop who kdirn kmli or eloppe how do otn iknrd lmki) ttah eth ddso aotir lilw hwos icansigencif fro oen utb not het h?erto

aSid f,ieetdnrlfy ni hte xmaleep vaeo,b dlcuo ntieag iecoosk ni leoepp how krdni klim elda ot a sningitacif ceneirsa teh skri of fetcni,oni tbu tno ni epelop how hwo nti'dd kidrn ?lkim

e'vI koolde duraon in tish tmcnmoe a,edrth nad aveh ense loeepp onnitem eth rmet fef"ect a"citnid;moifo si htta thwa ym xlmeaep ovaeb dlwuo hw?os

nI ohtre do,swr fi ieatng ckeoosi + ingirknd kilm esadl to a fsiantiincg iksr, but angeti ioecosk + ont gkdnniir kmli has on osaitadsec isrk, ldowu htta enam thta eht likm hsa na eef"tfc ioitcom"dfnai no the riks fo tigtgne nfiecotni in elppoe owh ate sicoe?ok

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submitted by unknown001(9)
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tish is a bsuon eosqnu.it

whne odsd iator si 1, imennag on icsoisnoat,a

dsdo r&tigtoa; 1, hihcw in stih oieusqtn is 6, namse iinssoocaat

weerh si ddos ariot ? a) ta het tea odcnooiikt-ed ridkn kilm ol.mcun hecen eht arnsw,e olny ookcei yptddneenienl sa.s with e oicl

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submitted by tyrionwill(22)
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we cna akme tsignh lipmse elik ihts : waiyf we wnta to wnok wehrthe ,or1X 2X taeoscelrr ,Y ew usjt arsaleetpy tset X1 and Y, adn 2X nda Y nglrc.ycdoia hWne test 1X iwth Y, ew urireqe no X2 eoxesr;pu heWn test X2 tiwh Y, we eerirqu no 1X esxepur;o

We stte ooekci iwht rdaeihra, enhw iklm saw not rdunk pto( ir)gt:h psvieito We ttes ikml wthi dirra,aeh wenh no cokeoi swa eaetn rowl(e rtg:ih) veanteig

n:inoosuclc yoln kcieoo tecsreoarl ot eht iaehdarr

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 -5  upvote downvote
submitted by lilmonkey(63)
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ehT dreoykw is EDssI).cdaeNYTNLotPNiDE"E"a( Wihch ni uahnm gnualgae nsema NT"O "I.STEDAOACS

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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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