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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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hist iqsnoteu aeskm em nwat to aet an e olic kocieo nda epoh i deleb tuo

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caitlyncloy  ckpi C adn omev on was my tatsyreg :P elph llo +2
thegooddoctor2  lol odog eon +1
sparta  LLO knhat uyo rfo tsih cmoemnt +


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 +15  upvote downvote
submitted by doodimoodi(74)
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iDd on noe enitoc that eth dOsd ritao no het pto tfle is nw?ogr mA I snmsgii ?nemgotsih fI yuo atuelcacl ,it tsi' 6 tjus klie the pot hgtir .ne.o..

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mjmejora  thast ytuaallc ayllre ufnny +
yex  suecBae I adsi so, ipapels .eher.. :/- +1
doodimoodi  naCt bivelee ew ayp $06 rfo sith arpc +50
aisel1787  sbet nmmocte )mdidiooodo +1
b1ackcoffee  thta gifuckn etwhr me fof on e.xma I wsa leik si reeth na tfefce oimtndfoiica yb ot"N ndrngiki "kmil. eht ukfc! +2


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 +8  upvote downvote
submitted by sne(59)
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RO ;1tg& dcnsietai eeircdsna eceroruccn of etven. The lnoy RO eerragt nhat 1 swa ni eth betal tath tendiadic ttha hte tbesujc eta csiooke utb n'ddit inrdk ikl.m sTuh, htta si the ylon noe wtih a sanniifcgit cueconrcer

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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 epploe woh yneaerllg dah rebtulo neidrag eth otw crhta:s

irtsF c:hrat We aeepdrats hte neetri nopuliapot otin otw emlrlsa siuoatolnpp to ttes rfo eht iecosok acffet. nI anoiuPlopt A rkd(na im)kl teerh aws na sodd toair fo 6 tyo(p ni the taulca thrc.)a nI ioPouantpl B (ddi nto indkr i)mlk rthee asw na dsod orati of .6 Senic eth sodd ioatsr rae otn 1, we acn onecdluc tath eth eooiskc heav an fectef delrasergs fo hte plnuopoiat ei( arkdn ilkm oepelp vressu 'ddnit kidnr klim )pep.oel

Sncoed rct:ah ewN ste fo noolptpiasu to sett orf hte eftcef of ilm.k nI npPooaitlu C ea(t kiose)oc eethr was an dods tirao fo .1 nI patnoPioul D id(d otn ate oics)keo rhete asw alos an osdd airto of .1 iThs smnae thta imkl idd ton aehv an fctfee erve dan tddni' tonrutcbei ot hte ie.saeds

O"nyl okeicso rea pntdendeyelni cstsieadao htwi E. clio es"cas amens thta lyon het kosocie acseu the deaises uiowhtt hte fesctef of gmothensi el.se

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 +7  upvote downvote
submitted by pg32(218)
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hTe tfca thta teh dsdo iator in eht pot ftel is itcrroecn easkm itsh qiosuent vrey tidfuclfi. It mskae it epaarp as if hte coeokis rea asaeutivc but eht likm hda osem otciervtpe f.aotrc So siob.xnoou

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drpatinoire  dGo I tohugth aolyltt eth esam ywa sa ouy idd. I taersd ta tihs euotqins ofr ta ltsae nmi5 nad sedak elmsyf th'swa wogrn wiht my tsast.isict +1


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 +7  upvote downvote
submitted by youssefa(162)
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ylalnIiti milk rnigdkin wsa acioetsasd with ioc.El krutaebo tiwh =O93.R adn 001.&t0P;l iniif..Sn()ag.ct Artef onrtsaifitacti tion ate eskocio nda ddi nto aet eciokos OR eacmbe 1 esitnda of 93. emgnian eth aiissatoonc .areppdiased rehoerfeT, giaetn okceiso asw a nducnrefoo dan tereh si no lrea snicsoatoia ebteewn rdnkinig klim nda .l.dti.E,n.e.aiocs 'imslk eh(t eondcuro)fn tbutcoiinorn saw bislepoenrs rfo hte OR fo 3.9 in eht tsrif .pleca iTsh aws erhdftuer dttamdeonser iwht OR fo 6 in the kosiceo elano pu.gor

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 +1  upvote downvote
submitted by sattanki(82)
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hiTs eon heert eewr uorf sddo ro,tsai noe ddipovre udern ahec lebt.a eTh only neo hatt had na sdod aiort ergerta tnah 0.1 was het aletb ni het tpo tgrih (ddsO aRtoi = 6, I i,l)ebvee wichh nhew yuo eodlok ta the ,beslla del ot the rgiht e.nrsaw

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submitted by famylife(110)
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"nA odds tairo fo 1 tnadcisei atht het oinoidnct or tneev druen stdyu is leauyql lilkey to rcouc in boht .usgrpo An odds iraot getrear hnta 1 naisdceti that eht ontdicion ro tenve si ermo yilkle ot rcocu ni hte ftsir o.r"upg (hi:/dektsrpawot/Oaoserd/wndpiig_i.ikti./)

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 +1  upvote downvote
submitted by xw1984(8)
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hTe OR ni eht epurp fetl 22 laebt is r,ecnrotci whhic huldos eb 6 (2726*/36 ,6=) ont 1. sThi senam het OR of te"a iecks"oo does ont cngeah trafe rtiiiofntctasa by dknra" ki,l"m so nr"kad mlki" is tno a deurfcon,no nad a"te kse"ocio si petynndenleid soas w/ HECE treobkua.

On the torhe hna,d OR for nr"dka k"mli acdnegh a otl o(mrf .39 to 01)., ichwh saiednitc d"knra ik"lm imhgt eb a enunrfcodo ,adn r,hreoeetf is tno enedyneintldp ssoa /w EEcH eau.tkobr

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 +0  upvote downvote
submitted by an_improved_me(91)
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A qinteosu i oerm gyeelanrl have i...s

Is ti iseslopb hatt ewhn you tysfirat eth a,dat e..(i ripnogcam het cfetfe thta intage oscoeki ,hsa in pleeop owh dnrki kmil ro eolppe woh do nto kidrn ikl)m htta eht odds tioar llwi wsoh geisiafcnnci fro neo utb otn eht e?rhto

iSda iyft,fnelred ni hte xpelaem eov,ab dclou ategin ocsoeik ni eloppe woh kidnr imkl elda ot a igaicfnints caseneir the isrk fo neitfcn,io tub nto in pleope hwo woh dni'dt rkndi km?li

e'vI okdole onaurd ni hist otcemmn rahted, and ahev eesn oelppe nmeotin hte trem cff"ete f"o;iicdmiotan is taht awth my lxmeeap baevo lwdou ws?oh

nI oterh swdro, fi nategi kescooi + dkngrnii imlk ledas ot a cfiitasngin r,ksi btu tageni eiocsko + ton nirgndki mikl hsa no osidatseca ,sikr uodlw atht enma that the lkmi has an "fcefet di"tiaiomfonc on hte ksri of gtentig cfioetnni ni oleppe who tea ekoiosc?

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 +0  upvote downvote
submitted by unknown001(9)
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htsi is a nousb .isuoqtne

enhw dosd taior si ,1 engmain no aot,snoacsii

sddo &;irtgota ,1 whchi ni isth eotuqisn si 6, mesna sionastocai

erewh si dsod otair ? a) ta eth tea i-ckitdondooe irkdn lkmi .unlcmo nehec het rne,saw lnoy oeiokc yddnetplneine sa.s hwit e loic

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 +0  upvote downvote
submitted by tyrionwill(22)
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we cna kame itshng pmslie keil sthi :awyi f we nawt to onkw heewhtr ,o1rX 2X tcserlroea Y, ew stuj seaytelpar stet 1X adn ,Y dan X2 adn Y crd.lacyinog henW ttes 1X ihwt ,Y ew qrureei no 2X eesxpu;or eW hn tset 2X thwi Y, we eruqier no 1X xreesopu;

eW stet ekcoio htwi eaa,drhri whne lmik aws tno udknr ot(p )h:rtig ipestvoi We stet mkil ihwt rheri,daa nhew no kioeoc asw netea wolr(e tgr)i:h teegniva

luncnocis:o lony cokeoi srraceetlo ot eht aeidrarh

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 -5  upvote downvote
submitted by lilmonkey(63)
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ehT yeokrdw is YaNoDL(TNa""cEdsNEIDPi.tEe)s hchiW in nhmua lagnuaeg saenm N"OT ASDEIACS.T"O

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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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