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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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sith tqiueons esmka em wnta ot tea na e iloc ekooic dan opeh i edbel otu

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caitlyncloy  pick C nad moev no saw ym stegtyar :P lehp oll +2
thegooddoctor2  oll dgoo one +1
sparta  LLO tkahn you rof isth ceonmmt +


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 +15  upvote downvote
submitted by ∗doodimoodi(74)
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diD no noe ceotni ttha eth Odds otira no eht tpo flet si ?wgron Am I missngi e?monstgih If you tleualcac ti, ist' 6 tusj leik the pto gihrt o..ne..

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mjmejora  atths alatyluc lalyre nfuyn +
yex  aBuesec I iasd o,s alipesp r.e..eh :/- +1
doodimoodi  tCna vlbeeei we ypa 0$6 rfo isht cpra +50
aisel1787  bste tmcneom ddioodmooi) +1
b1ackcoffee  ahtt ufcikgn twrhe me fof no e.xam I swa elki is eetrh na ffecte doitimnfaoci yb toN" kngndrii l"k.mi eth uf!kc +2


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 +8  upvote downvote
submitted by ∗sne(59)
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OR ;g1t& ditcaesni easrendci cereonucrc fo vne.te ehT ylon OR earrget naht 1 wsa ni eth laebt ttah inadetcdi atth eth uctbsje tea skoieoc ubt 'itddn idrkn .ilmk s,Thu ahtt is hte only eno whit a ainsgfitinc urrcoceecn

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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 pepoel how eyrlgealn ahd uetlbro garnide teh wot htsarc:

sFrti :rathc eW tresedpaa eth itnree ooanupptil nito tow arslelm topsliaunop ot stte ofr the ikoocse ae.tcff In ounpltiPoa A (ankrd k)lmi hrtee swa na dods taori of 6 yt(po ni teh utacal r)hatc. nI tnilpoaouP B (did not kdnri )mkli eetrh saw an dsdo aoirt fo .6 ceSni eth ddso trsoia era otn 1, ew cna cnluecod tath eth cskeooi ehav na ftcefe esdgsralre of eth pluapnitoo ie( adrkn mkli ppeloe russev ndi'dt idnrk ilkm lepo.pe)

conedS c:rhta New tse of ptlispuooan ot estt rof eth tffcee of i.mlk In Ptlnoouiap C ate( ic)eosok rethe was na dods artio fo .1 In oauoitpnlP D did( not eat esko)oic ehetr saw alos na sdod iraot fo .1 hsiT sanme tath limk did otn eahv na cetfef reev and 'niddt uttncrioeb to het eed.assi

lyO"n sokoiec ear idlpydtneeenn ssteoacida hiwt E. loic "sseca easmn atht loyn eth ckoesio auesc teh deasise uthtwoi eth feftcse fo nomhisgte le.se

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 +7  upvote downvote
submitted by ∗pg32(218)
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eTh tacf that the ddso ratoi ni het top ftel is cirontecr mkaes itsh sqeotnui vrey luifftic.d It eksma ti paearp sa fi het siookce are svtceaaiu utb eth mkil dha emso vetrtceopi tc.oafr So ibnsoxo.ou

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drpatinoire  doG I guthoth tlylaot het msea yaw as you ddi. I artesd at tihs oiqsutne ofr ta atles in5m dna skeda ysflem wtash' rwgon hwti my scii.statts +1


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 +7  upvote downvote
submitted by ∗youssefa(162)
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yIaiilltn iklm grnidkin was sdecatiaos ihwt cEoil. orakbute ithw O3=.R9 dan 10P;.l&0t0 tin)cai.i(n.f.gS etAfr atficnsiatriot tnoi tae kieoosc nda did ont eat ieckoso RO aecmbe 1 isntead of 93. menagni eth iaaintsocos r.siedppaaed reh,oTerfe eintag oicekos aws a ooedrucnfn and herte is no alre acianisotso bweenet gndkinir klmi adn al.tcn..eEd.si,.io i'kslm ht(e redo)ofuncn oirionbcnutt asw sbliepoesnr for eth RO fo .93 in hte tifsr eclp.a siTh swa trdrhefeu totdrasmeden twhi OR of 6 ni teh okeiocs oelna prugo.

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 +1  upvote downvote
submitted by ∗sattanki(82)
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ishT eno ehter weer furo dods st,riao noe ddrviepo under aehc ebtl.a ehT olny one tath had na odds tario getrera atnh 1.0 was het ebtal ni het top hrgti (ddsO otRai = 6, I ,velebei) hchiw nhew oyu dolkoe ta the b,salle edl to eth trghi ensrwa.

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 +1  upvote downvote
submitted by ∗famylife(110)
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"nA ddso ritoa of 1 ndatecsii ttah teh codinitno ro etnve rduen yduts is luelaqy kilyle to corcu ni hobt .ogsupr nA dsod taoir ragreet tnha 1 ainedcsit taht hte itninoodc or envet is moer yllike ot uorcc in eth tfisr oup"gr. (o/riO..tw_thws/nsiiai/iepek/ddgroa:ktpdi)

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 +1  upvote downvote
submitted by xw1984(8)
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heT OR in het uperp fetl 22 ablte is recctroi,n hwhci lhusdo eb 6 2(7*6326/ =6,) not 1. iTsh msena eht OR of t"ae ei"sckoo sdoe not hengac aeftr asiarftcittion yb "dakrn ,mi"lk os drak"n m"kil si tno a eduroon,cnf nad "eat c"ieosko si eednlinntyepd ossa w/ CEHE erakbout.

On eht retoh nha,d RO ofr rad"kn imk"l hagcedn a tol fr(om 93. to )10., hciwh icsatndie ra"ndk kmi"l itgmh be a nuroofdenc ,nad rhoeerte,f is not tinelydpnende oass w/ EEcH eaukorb.t

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 +0  upvote downvote
submitted by ∗an_improved_me(91)
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A qtsueino i more nllrgaeye ehva ..i.s

sI ti oeipslbs thta nhew you iftyatsr het tdaa, i..(e cngamprio het eetffc atth ntegia skeooic a,sh in epeopl owh rnkdi klmi ro ppeelo woh do nto rdnik )mlki ttah eth dosd ratoi liwl owsh giaccnfsenii fro eon btu ont het o?treh

Sdia t,lefyirfnde in het mpeleax baov,e loduc ngaiet koioecs in opeple woh nkrdi kmil adle to a iaifnitgcsn cneeiasr eth iskr of ,octifnein ubt not ni poplee ohw woh 'tddni rikdn l?imk

'Ive okoedl oanrud in iths ncomemt rate,hd nad evha eesn eleppo ionemtn teh tmre ce"tfef ciimdoni;aoft" si atth waht ym malpxee ovbae dolwu osh?w

In rohte wod,rs if aeitgn eiockso + giidnrnk mkil asled to a tisgfnianic ,kisr tub gnteia ooekics + ton ngdkriin imkl has no saitoescda ,sikr woldu tath aemn ttah hte iklm ash na fec"tef mt"ioiindfcoa no hte isrk of gniegtt otcniefin in eeoplp hwo tae cokoesi?

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 +0  upvote downvote
submitted by ∗unknown001(9)
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tish si a uonsb entiou.qs

enwh sddo oirat is 1, mnginea on osoa,ictiasn

sdod rtao&t;ig ,1 hihcw ni isth entusqoi is ,6 neasm tsaiacsiono

ewrhe is dsod tairo ? a) ta het eta do-cnkeitodoi drkin mkil uo.lmcn hneec teh arensw, nloy ioeock dydennpenltei s.as twhi e iolc

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 +0  upvote downvote
submitted by ∗tyrionwill(22)
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we anc kame gtsnih ipmels kiel hsti a:fyiw ew wnta ot nkow ehtwehr ,rX1o 2X oartreslce Y, we sjut yelrtaasep ttes X1 and Y, adn X2 and Y cciagdynlr.o e nhW ttse 1X hwit Y, ew eiurreq on 2X ee;rxposu n hWe tste 2X hiwt Y, ew rerqeiu on X1 s;ueoerpx

eW tets oioeck hiwt aadiherr, hnwe klim saw tno dknur p(to rt:ghi) epotisvi We etts mikl thiw hrdir,aae hnwe no kioceo asw aente w(oler t:gir)h tivegena

l:sunnoccoi nloy eoocki aescloerrt ot eth ierharda

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 -5  upvote downvote
submitted by ∗lilmonkey(63)
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eTh doreywk si TNes"EPI)ca.iNEDNdLD(aEYot"s chWhi ni unmah uenalgga mnase NO"T O"IAEA.DSTSC

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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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