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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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shti ionqsteu smkae em watn ot eat na e ciol okcioe dna hoep i eebld otu

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caitlyncloy  kipc C and meov on saw ym agetstyr :P pelh oll +2
thegooddoctor2  oll doog oen +1
sparta  LLO akhnt yuo rfo ihst emtmcno +


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 +15  upvote downvote
submitted by doodimoodi(74)
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Ddi on eno niocte hatt hte ddOs aotir no the pot tlef is gor?nw Am I ssigmin o?geisnhmt fI oyu atluclaec t,i i'ts 6 jtsu liek het opt girht o..e..n

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mjmejora  httsa tuclylaa rllyea uyfnn +
yex  suBaeec I isda o,s esilapp h..ere. /-: +1
doodimoodi  Cnta eliveeb ew pay 06$ ofr htsi pcar +50
aisel1787  sbet mocnetm ddoiooo)idm +1
b1ackcoffee  htat cgunkfi whter me off no amxe. I was elik si erhet na cteeff acoiomifidtn by ot"N kininrdg m.lki" het kuf!c +2


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 +8  upvote downvote
submitted by sne(59)
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OR &1;gt nitcsieda acrdiesen rocnucecre fo .nevte ehT ylno RO rgerate tanh 1 wsa ni eht atelb htta adicneidt hatt eth tsbjeuc eat koisceo but ditn'd ikndr .lmki huT,s htta si hte lyno eno htiw a cangfstniii cerccneoru

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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 pleepo hwo ganlylree ahd tuborel daegrni het two ah:rcts

iFsrt ht:acr We tederpsaa the reneit olupopatin tion otw smlaelr sontpapolui to test fro eht kosocei fe.acft In oaptlunoiP A (nradk mkli) reeht swa na sdod otira of 6 op(yt ni the clauta t.cr)ah In palotuioPn B ddi( tno ikrnd )ilmk etreh swa an sdod oaitr of 6. cineS eth sddo aitosr rae otn ,1 we acn dclnouce ahtt teh sieokco vhae an eefftc srleesrdag of the unptpaiool (ei anrdk imlk eeoppl vsusre t'indd irdnk imkl )leppoe.

eSdonc :rhact wNe ets fo apntpoluios ot etts for eht teecff fo imk.l nI luointpPao C t(ea s)ciokeo heret was na sddo toira of .1 In oitloPanpu D ddi( ton tea ke)csioo ehter aws asol na dods itrao fo 1. siTh mneas htta ilkm idd not ehav an feftec eevr dna tiddn' icrnbottue to hte eisa.sed

Ol"yn ikesoco era neidlynndptee soaitsaced hwit .E coil cse"sa asmne htat onyl eht ooiksce usace eht eidaess uwthito eth ffescet fo iemghtnos .sele

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 +7  upvote downvote
submitted by pg32(218)
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eTh catf that teh dods roita in het otp ltef si tcrnroeic maeks hits otqinsue yvre fcliu.tdfi tI eksma ti pepaar as if eth ooceisk rae ecatausiv utb the klmi dha omes otptcevrei caof.rt So sxo.ibuono

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drpatinoire  doG I otuhthg ytalolt the emsa wya as you .did I esdrta ta hsit etuqsnio rof at tlsae 5inm dna kdsea slymfe tshaw' wrgon thiw my tsi.tacstsi +1


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 +7  upvote downvote
submitted by youssefa(162)
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itlilIayn lmki dkrignin swa taisdoscea wiht cEoi.l autbreok thwi O9.R3= nda 1.&00;0lPt an)tSin...(cfiig rtAef tiattsoariicfn otni aet kcooise and did not eat kocsoei RO ecaebm 1 astnied of .93 maingen eht nsoctiasaoi eadpsrpadei. ,eerorfThe angite kiooecs saw a oderfnunoc nda erteh is no eral toioniacsas ewbente rikndign lkmi and tnsdE.cei.,i.o.al. sk'mil (teh refoocn)udn nttcnioribou wsa rnbsieeslpo rof hte OR fo 93. ni eht tfrsi p.elca shiT was frtuhered tadosnremtde twhi OR of 6 ni eht koocsie naoel pgur.o

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 +1  upvote downvote
submitted by sattanki(82)
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hsTi eno erhet wree rfuo odds tsir,oa neo edidrpvo edrun ceha abl.et ehT oynl noe that ahd na dods irota teargre nhat 10. swa eht eablt in the pto tgrih (dOsd oaRit = 6, I vielbe),e ihwhc newh you lkoedo ta the lsaeb,l del ot the hitrg waers.n

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submitted by famylife(110)
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nA" dods iator of 1 tniiasedc taht teh tnniioodc or enetv nuerd dusyt si ylaluqe kyeill to ocucr in tobh opru.gs nA sodd roiat eatrger ntah 1 ciestinda atht the oditincon ro nteev is remo lykeil to cocur ni eht risft "uo.grp (kprp.w/di:ikgetn/otaOdoas/_i.tsi/hrdiwei)

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 +1  upvote downvote
submitted by xw1984(8)
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The OR ni eht repup elft 22 btlea si t,ncrreico ciwhh dosuhl eb 6 27(*2/636 ),6= ton .1 ihsT sneam hte RO fo a"et coeksio" soed tno cghaen aterf tianscfoitaitr by "rkand ,ikm"l so ndkr"a "klmi si nto a cnodonrf,ue adn "tea ec"okosi si yndnlpeteidne osas /w HECE kaobr.etu

On het teohr hadn, RO rfo dn"kar ilkm" hagcedn a olt rf(mo 39. to 10.), cwhhi iiatdcens krnad" k"iml htimg eb a ofcrdnoeun nad, rehro,fete si nto inelyeendptdn sosa /w EcHE krb.euaot

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 +0  upvote downvote
submitted by an_improved_me(91)
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A touiqesn i orme ryalengel haev ..si.

sI ti lpbsioes hatt ewnh uoy ytfsirat the ad,at .(.ie romicgnpa het cetfef atth giaetn kciseoo ha,s ni eepolp hwo rdkin limk or peoelp woh do ton rnikd kml)i that hte sodd arito lilw wsoh cisangneciif for oen but otn het oe?rth

aSdi nrfdfytiele, ni het amelepx ,evabo docul tienag cioeosk in opeple owh ndrki ilkm aled to a gcsiiatfnni eesnrica het ikrs of ifcionnt,e tbu otn in leepop who how ddt'in rkndi mlk?i

ve'I odoekl uanord in sthi onmcetm ,dareht nda ahev nees pleope tnoniem eht rmet te"ecff iinmafto;codi" si ttha ahtw ym elmaexp aobve olwud hswo?

nI oehtr odrsw, if egiatn cisoeok + iikngrnd kilm aesld ot a tfinsaicign sr,ki but nagiet sooceki + ont gikndinr mikl hsa on aocstedisa ir,ks oudwl hatt mnae that the lkmi sah na t"efcfe iomfda"tocini no het rski fo ieggtnt ifticnone ni poeple ohw eta ?eocoski

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submitted by unknown001(9)
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isth si a ounbs .uqnestoi

nweh sodd iorat is ,1 genniam on ntassai,ooci

dsod rt&itaog; ,1 hwhci in ihts iuqetons si ,6 nmeas aissciootan

eehwr si dods tario ? a) ta het eat dk-ocntdoieio dnkir iklm .lmocnu hncee eht ,arwsen loyn ikecoo lnnndtediepey as.s hwti e lcio

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submitted by tyrionwill(22)
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we acn ekma shigtn mpisel keil tish fway i: we anwt ot kown werheht r1,oX 2X sraecertlo Y, we ujts stleapyare stte 1X nda Y, dna X2 adn Y iy.ngoacrcdl nhe W etts 1X hwit ,Y ew urqriee no 2X ;oesupxer eW nh stet X2 iwht Y, we urqeeri no 1X ;uersxoep

We stet coeoki twih ihed,aarr wenh mlik swa tno nrkdu (top ihrgt:) oepsvtii We stte mikl ithw dra,arehi ehnw on kecooi saw teean rew(lo h)igtr: etgvnaie

scnuco:oiln lnoy cokoei rcaesortel to hte rdriehaa

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submitted by lilmonkey(63)
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heT dweorky si NDaETa"id(cYE.t)"sIPNsoDEeNL chiWh ni mnahu gnlugaea masne "OTN .SSDAIOE"CAT

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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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