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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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siht otqiuesn kemas em wtna ot ate na e loci ckoieo and eoph i lebde otu

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caitlyncloy  ckpi C and vemo on wsa ym ayegttsr P: elhp lol +2
thegooddoctor2  llo oogd one +1
sparta  OLL tnkha uyo fro thsi metconm +



 +15  upvote downvote
submitted by doodimoodi(74)
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dDi no one ctonei tath het Odsd torai on hte pto telf si won?rg mA I iignmss ohn?mstegi If you eltlacuca t,i sti' 6 tjus klie teh pot ghtir e....no

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mjmejora  shatt uctllyaa lyalre yfnnu +
yex  uesBcea I adsi so, esaiplp e.e..rh :/- +1
doodimoodi  atnC beeielv ew ypa 60$ orf tish cpra +50
aisel1787  etbs oemmctn ddid)ooioom +1
b1ackcoffee  that gkiucnf ethrw em ffo on em.ax I asw eilk is reteh na effcte otifdicnaimo yb ot"N rniingkd .i"kml the ukc!f +2



 +8  upvote downvote
submitted by sne(59)
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OR g&1;t snectidia dcareisne ceucrnroce fo t.veen hTe oynl OR raeegtr htan 1 aws in the btlae tath idnditcea that eth bctjesu ate cokesoi utb ddnt'i kirdn lmk.i sT,hu hatt is teh nyol eno with a icfiginnsat ucnccroeer

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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)


 +8  upvote downvote
submitted by qiss(20)
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roF eopepl how eylngarle adh etobrlu iradeng the two shtr:ca

Frtsi :hcrat We reataspde teh teenri ouatlpnopi nito wot mselrla pisolptaonu ot ttes rfo eht oeocski teac.ff In uloPnaipot A (knrda mli)k three wsa na dosd aroti fo 6 topy( in het aalctu r.ctah) In unilaooPpt B di(d ont rindk kim)l ethre wsa an dosd artoi of .6 cneSi eth odds aoirts ear not 1, ew nac lucdoenc taht the cooisek vhea an eetfcf easredgrsl fo teh ntuaplpooi (ei nardk kmil popele vuessr 'tiddn nrkid milk ppel)o.e

dSocne ra:cth eNw tse fo oslupniapto to test fro hte teffce fo lmik. nI pPlanotiou C t(ae esiocok) tehre aws an dsod iorta fo 1. In apilnooPtu D (idd not eta ices)ook heetr asw oasl an sdod aoirt of 1. hsiT smaen htat kmil idd not heva an fetecf erve dan di'tnd rteibtuonc to het dea.sesi

lO"yn ikcoeso era neylpdnndeite seasidctoa ihwt E. icol sscea" enmsa hatt only teh oieckos ausec teh esdiase uiwtoht eht ftfcees fo moishgnte el.es

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 +7  upvote downvote
submitted by pg32(218)
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hTe cfat hatt eth sddo aotri in eht opt felt is nctriorec emask this eunitqos evry iucfltdfi. It saekm ti rpeaap sa fi hte kscooie era saituecva but eht mkli had eosm eepittocrv .crftao So nsioxb.ouo

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drpatinoire  God I togthhu ytoltla eht amse ywa sa uyo did. I etdsra at siht soiqenut fro at aelst mi5n dan aeskd myslfe hsta'w orgnw ihtw ym tscts.itias +1



 +7  upvote downvote
submitted by youssefa(162)
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Ilnltiiya imkl irkndngi saw sacoiesatd wthi loc.iE eukatbro thwi 9=.R3O and ;.0P10l&t0 a).Sgi.i.(tcnfni teArf inttisifaocatr oitn tea oesiock and did tno tae ckiosoe OR mcebea 1 adtisne of .93 naniegm the acnistaoois redsdaaei.pp ,rroTfeehe engtia ioescko was a ounefondrc dna ehrte is no alre aioncostsia beeetwn drnkngii likm nad c.tn,lia.i.Es.d.oe lmis'k (eth )uoefnrcndo tticobinunor asw libprsnseeo rof eth OR of .93 in het stirf a.cpel This swa ehtrefurd erenaosmdtdt ihwt RO of 6 ni het coseiok enola opr.gu

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 +1  upvote downvote
submitted by sattanki(82)
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Tsih one tehre were fruo dods ,sairot neo ddpoievr erudn each etb.la The lyno oen ttah ahd an ddos rtiao tregrea athn 1.0 was het ltbea ni hte opt ghitr (sOdd ioaRt = 6, I v,)ebilee hwchi nweh oyu odolek at teh ells,ba edl ot teh grtih swer.an

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 +1  upvote downvote
submitted by famylife(110)
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"An dsod roait fo 1 iscnetdia ahtt het otcnndioi or vente ndrue ysutd is aqueyll lyeikl to ocurc in tohb r.uopgs nA sddo rtaio erteagr anth 1 dtcnisaei atth het onidciton or tvene is mroe lykeli to rocuc ni hte frist .grpo"u (i:iorspr/o_i/tdhgadidktw/skne.paw.Oi/tei)

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 +1  upvote downvote
submitted by xw1984(8)
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Teh RO ni teh reupp ltfe 22 bleat is trorcenci, hciwh duhosl eb 6 7(232/6*6 ,6=) ont 1. shTi aesnm the OR fo e"at ioeo"cks eods ton gaehnc afetr tinioaciarfstt by ankr"d m,lk"i os k"andr m"ilk is ont a oor,nuncefd dna ate" ksi"oeoc is ipnedeetdnlny ossa w/ CHEE .outkebar

nO teh hrote ,nhda RO ofr "ankdr mi"lk nhgcade a otl rm(of 3.9 ot )0.1, hwhic tainisecd ank"rd k"ilm mgtih eb a fcduoronne ,nda eerfr,oeht is not idenenedylptn oass /w cHEE .tuoeabrk

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 +0  upvote downvote
submitted by an_improved_me(91)
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A seuinotq i mroe glnyleare aveh .si..

Is it sbeoplsi hatt ewhn uyo ryfatist het taa,d i.(e. mrignpoac het fetecf taht nitgea sockoie a,sh in plpoee ohw nrdki mlik ro ppeloe hwo do not nrdki mk)il ahtt teh odsd aotir liwl show iigciefnsanc orf oen btu ton the ?toerh

iaSd ndeltiref,fy ni teh eleaxmp v,oeba dlcuo nteaig ieoocsk ni lepepo who nkdri mlik elda to a tsnanifigic raniesec eth isrk of nifioncet, btu otn ni epoelp woh ohw dtdin' knidr lmk?i

'veI oldkeo ruaond in ihst tcmonme a,ethrd dan eavh esne popele oniment eth ermt t"eecff nomfodi;ic"ita is atht ahwt ym exmelap eoabv wuodl swo?h

nI hreto wsrdo, fi ageitn ocksoie + niidkgnr klim aedsl ot a nfsctigniai ,srki but gteina iocsoek + otn diinrngk limk ahs no castoedias s,irk wdulo atth mnea that het likm sha na feet"fc ftianoocidim" on eth krsi of tgiengt inociften ni popeel woh ate s?eiocok

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 +0  upvote downvote
submitted by unknown001(9)
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sthi is a ubons iu.ostqne

hnew odsd itaro is ,1 enmanig on ticnaa,ossio

dsdo &roga;tit 1, iwhch in isth utnoqsei si ,6 mnsae oatinciaoss

reweh is dsod oiatr ? )a at teh eta dotckoii-done nikrd kilm lu.nocm ehcne hte snwe,ra lyno kicoeo edeenypdninlt .sas thwi e clio

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 +0  upvote downvote
submitted by tyrionwill(22)
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we cna maek sthign mlepis lkie shti w:ifay we wnat ot owkn rwhhete 1roX, X2 cseoaetrlr Y, we jsut yselrtaape estt 1X dan Y, dan 2X nad Y rcingolaycd. enWh stet 1X hitw ,Y we rieqrue no 2X ;seoxerup hneW tset 2X iwht ,Y ew rqeriue on X1 ;xoepseur

eW estt eocoik whit reaidarh, wenh iklm aws ont nurdk pt(o htr:gi) isivotpe We ttes likm twhi rehd,raai hewn no ooieck was taeen oelwr( ri:)hgt eentvgia

l:occsionun lyon iceook eoreslatcr to het diarahre

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 -5  upvote downvote
submitted by lilmonkey(63)
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The yoerwdk si sE(IDENNciNeYs)Da."tLoTEadP" hihcW ni nauhm euangagl samen OT"N .IASA"ECODTS

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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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