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NBME 21 Answers

nbme21/Block 4/Question#3 (23.9 difficulty score)
A study was performed that evaluated the ...
Odds ratioπŸ”
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 +12 
submitted by neonem(549),
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shiT is a anescco-lrto tdsuy esabuec it stesecl frsti yb dseesia oomutce e(citelalntul iiy)dbtlsai adn tneh eyvttirocrela klsoo at srspru/eisekox VT( gea)su. dsdO sotiar rae usde ot auaeelvt ccn-toseaolr ue;sdsti fi reteh asw a otpiives staonrpeiilh nbeweet VT use dna tlalnlcteeiu b,ytilidsai hte RO owudl ysa nihtmgoes liek enihrCld" whit anelittleclu tdbieiaslsii reew 3 tmsei roem lilyek to vahe 2 ro more soruh fo TV mtie rpe yad ntah cndreihl ttohwiu ttellclniuae lbse"aiti.iids

vRetiale risk si sued rof cotohr e,tuissd whhci frtis eneifd an uperxeso T(V s)eu nad tenh olok at teh emctouo enttllcIeal(u ii)d.ylsbtai A iaevletr irks wdolu eb mero eilk sanPet"it thiw 2+ rusoh aVy/Td era ta 3x rgihhe rkis ot dlovepe atluetelcnli iyitlidbsa nhat edhinlrc wthi tl;&2 .suhr"o

,aliplyTcy RO nad RR era lmsiiar ebnsumr btu atth isumasoptn sakebr wdon at a earctni op,nit I nikht ehwn het aedssei is eyvr earr or s.ehoingtm

drachenx  Following up on Neonem's comment OR = RR when you are dealing with a RARE disease. +4  



 +5 
submitted by emmy2k21(23),
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uJts a mmeconni ot peke tcrak of ceas lctnroo w/ sdod taori dan toorch /w retvelia ris.k kntTo:CChin-s aROle ninlntileoayt mpsedislel ofr ddos thorCtiRo Roa rof eaerltiv sikr

makinallkindzofgainz  I like Dr. Ryan's way to remember it better: Just look at the 2nd to last letter in each word. Case ContrOl --> Odds Ratio and CohoRt --> Relative risk :) +3  



 +0 
submitted by bbr(22),

Study: TV exposure ----> Disability

Sorting by disability/disease = Case-Control

BnB approach: contrOl (2nd to last letter is "O"--> "O"dds ratio)

(if we were sorting by exposure, that could be cohort, use RR)