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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 qesuotni sekma me tawn to eat na e oicl koieco dna ophe i ldebe uot

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caitlyncloy  kipc C nda evom no was my gyrtaets :P eplh llo +2
thegooddoctor2  lol odog one +1
sparta  OLL khnat uyo for htsi mcmento +


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 +15  upvote downvote
submitted by ∗doodimoodi(74)
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Ddi on eon cneoti ttah teh Odsd aiotr on hte pto lfte is g?wrno Am I nsigmis hsgtieno?m If ouy caltuelca t,i tsi' 6 jsut liek teh otp grthi .oen...

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mjmejora  htast luyctala llryae fyunn +
yex  suaeeBc I dasi o,s ppeilas eer..h. :/- +1
doodimoodi  atCn veeleib ew apy 0$6 orf isth prac +50
aisel1787  best omcentm ood)dodomii +1
b1ackcoffee  thta gknifuc hetrw em off on mxae. I asw lkie si rhtee na cteffe fioitoincadm yb ot"N rkngniid ml"k.i teh kucf! +2


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 +8  upvote downvote
submitted by ∗sne(59)
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RO &g1t; aidetsnic daiecesnr cecrrcuone of enevt. heT olny OR egtrear htna 1 was ni eth baetl htat eaidtndci hatt teh uesjbct ate oskieco tbu it'ddn dknri kim.l u,Tsh ahtt is eht ynlo noe wthi a nsatcfiigin reeocrcunc

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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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For lopeep ohw aeenrlgly dah leortub inregad eht wto hsr:cat

srtiF thcra: We aaepsdetr het neeitr noippaltou otin owt elmlras ppiousntlao to stet ofr hte skiecoo .cetaff nI oliaotpPun A kad(nr mlk)i etreh saw an ddos troia of 6 ypo(t ni eth tlauac .cht)ra In oalniPuotp B did( otn nrkid mk)il three swa an dsdo iarto of .6 ceiSn het osdd staroi are nto 1, ew acn dlccnoue that eht icksoeo have an ffecte aslrrgeesd of teh pouapioltn ei( nardk mikl lopepe vsusre 'nddti rdnki likm p.l)epoe

oecSdn r:hatc weN ste of tlnpuoipaos ot sett rof eht efftce fo l.mik In pnauiotPlo C ae(t keiooc)s reteh asw an dsod ratio fo 1. nI ltPoanipou D idd( nto aet ooikc)se etehr asw osla na sddo rtiao fo 1. iTsh sanme taht likm ddi otn eavh na tcefef erve dan ind'dt cueirbnott ot eht ds.ieaes

l"yOn eikoosc era ditepnnenedly edaoctassi ihwt .E olic "ceass amesn ahtt yoln hte eokcsio ueacs the easeisd huoitwt eht setcffe of othgnmsie ls.ee

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 +7  upvote downvote
submitted by ∗pg32(218)
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ehT caft thta eht dosd aiort in hte pto eltf is ocrtceirn mskae thsi iqueotns vrye ifi.fcutdl It ksame ti praeap sa fi the coikeos era cuatiesav tub teh ikml dah meso covrteptie f.artco oS o.xobisnou

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drpatinoire  odG I tohhgut olyattl eth mase ywa sa oyu dd.i I aetsdr ta itsh oestquni for ta elsta nmi5 dan dkesa mleysf sat'hw wgnro hwit my ai.stscttis +1


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 +7  upvote downvote
submitted by ∗youssefa(162)
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niatliylI klim gnkirnid aws sicesotada tihw Eioc.l aotubrke ithw =93.RO adn &P0l0.0;t1 ngin.t(fSiia)..c tAefr iiatacrntostif tnio tea eosoick dan idd otn ate ikceoos RO mbacee 1 nidstea fo 3.9 niegman the onsoiiacsat adrpdeaies.p ehrfo,reeT igtaen oekiocs asw a oocrnnedfu dan tehre is no aler sostnicaiao tbeenwe rnnkigdi ikml and n.E,eca.o.ltd.iis. iks'ml teh( ncund)rofoe toonbitinruc aws iopbsesenlr rof eth OR of 3.9 in teh rsfti epcla. sThi saw trudfrehe msndeatdoetr hwit OR of 6 in hte cooeiks loaen g.puro

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 +1  upvote downvote
submitted by ∗sattanki(82)
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hsiT noe hteer reew oruf ddos sitro,a noe vdipoerd nuerd aech .btale ehT lony neo ttha ahd na odds iatro ertaegr ntha 0.1 swa hte atelb ni het opt girht (sddO aitRo = 6, I ev,)belei hiwhc hwne you klodeo ta the slaeb,l edl ot teh thrgi e.wsanr

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 +1  upvote downvote
submitted by ∗famylife(110)
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"nA odsd tiroa fo 1 dnaiietsc hatt eht oiicndnot ro evnte nrude dytsu si luyelaq ileykl to oucrc ni hobt rg.upso nA sodd aroti grterea hant 1 iesctiadn ttah the toinicond ro vteen is orme llieyk ot urcco ni the rtfis u.ro"pg (p/shoitoi/pgwenira/id/st_a:keiw.dt.Oidrk)

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 +1  upvote downvote
submitted by xw1984(8)
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ehT OR in hte rpepu etlf 22 tblea is ctceonirr, ihchw uolshd eb 6 (72*26/36 6,=) ont .1 hsTi asenm eth OR of aet" "ooiseck sedo nto gnheac tafre ificatrntoiats by nda"rk ,mk"li so rd"akn lkim" si ton a cnorodnuf,e and ea"t ci"esook si pndledneenyti saso /w CHEE .bkaorteu

nO the rehto nad,h RO for dk"arn km"il ngecahd a tol m(orf .39 ot 01,). hcihw idsenatci darnk" "klim gihtm be a ncenoodfru dna, efthereo,r si ont tdidenpynneel oass /w HEEc bk.atoeur

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 +0  upvote downvote
submitted by ∗an_improved_me(91)
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A onsutqie i reom gyaenller aveh is...

sI ti esoblspi htat wehn ouy fiattrys eth da,ta .i(.e crgmaopin eht cefetf ttha gnaiet isookce ,ash ni oppeel ohw irdnk lkim ro pepole hwo od otn knidr kmil) hatt eth dsdo itroa iwll owhs egicifinascn for noe but ton hte ?rehot

aSid fyftrelndi,e ni het xeeaplm ,bvoae odluc agtine oskecio ni lppoee ohw dinkr ilmk aedl ot a nfnsgtiiaci nsacriee eht irsk fo ,infinetoc utb otn ni olpeep owh hwo 'tdidn irknd iml?k

Ie'v doeokl unroda ni this moecnmt ed,arht dna evah eesn epoepl noenitm hte mtre tfcfee" oio;idafitcn"m si atth hwta my exmlpea oabve uowld ?wsho

In orhte ,srwdo if nigeta iksooec + nirdkgin kmli sdael ot a inctfaigsni ris,k tub itaegn iskceoo + ont iginrdkn iklm ash on adastieocs ,sirk olwud hatt name atht hte ikml ash na "eftefc foodn"caitimi no eht risk fo tgtenig ncfintieo ni poeepl how eta eosoc?ik

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 +0  upvote downvote
submitted by ∗unknown001(9)
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hsti si a busno tsuiqeon.

hnew dods toiar is 1, aemngni no ncoaoi,stais

dsdo atgr&;ito 1, hihcw in tsih oisuentq si 6, asenm naoiissctao

heewr si sddo toari ? )a ta teh ate tdok-oeicdnio rinkd ilkm nmucl.o heenc teh nwr,sea oyln oockie tldeeniyenpnd .ssa twih e lico

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 +0  upvote downvote
submitted by ∗tyrionwill(22)
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ew acn emak hntgsi spilme keli sthi :iyfa w ew awtn to onwk hrwethe r,1Xo X2 ocselrrtea Y, we tjus seratyalpe tste 1X dan ,Y and 2X nad Y dlaiccnyo.rg nWeh ttse 1X whit Y, ew qereiru on 2X p;oexsrue heWn stte 2X whti ,Y ew ureqier no X1 es;xeourp

eW stte ocieko thwi aadherir, newh ilmk wsa otn dnruk pt(o :hgri)t sivetoip We sett lmki wthi rhrea,adi newh on koioec aws ateen wero(l ihr:)tg aeegvnit

:nosncliuco nloy cokioe teolcsraer to eht raariedh

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 -5  upvote downvote
submitted by ∗lilmonkey(63)
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The dywkreo si YLNceP"DNEoEE"IDt(d.aisas)TN Wchih ni uanhm ggeunlaa enmsa "NOT SO.DTCA"ASIE

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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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