what is an odds ratio
TRANSCRIPT
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7/29/2019 What is an Odds Ratio
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#HRIS#ATES-!&2#'0$2#/''ENERAL0RACTITIONER7ATFORD
4ORECAPFROMLASTMONTHRISKS
MEASURETHENUMBEROFEVENTS
ASAPROPORTIONOFTHETOTALnIF
TENOUTOFTOTALSUFFERABAD
EVENTTHERISKISnWHILE
ODDSCOMPARETHENUMBEROFEVENTSTOTHE
NUMBERFREEFROMANEVENTSOWOULDBE
OR&ORRAREEVENTSRISKSANDODDS
COMETOAVERYSIMILARFIGUREBUTFOR
COMMONEVENTSTHEYCANBEVERYDIFFERENT
4AKEFOREXAMPLEOUTOF4HIS
WOULDBEARISKOFBUTODDSOF
WHICHISTOONEnAFIGURETENTIMESHIGHER
THANTHERISK
)FWERETURNTOTHETABLEOFRESULTSFROM
THETRIALOFNURSINGINTERVENTIONSTOHELP
SMOKERSTOQUITBELOWWECANNOWPROCEEDTOCOMPARETHERESULTSFROMTHE
CONTROLGROUPANDTHETREATMENTGROUP4HE
NUMBEROFTHOSEWHOSUCCESSFULLYQUITIN
THENURSEINTERVENTIONGROUPCOMESTO
OUTOFATOTALCOMPAREDTOTHECONTROL
GROUPWHERETHEREAREQUITTERS4HE
RISKRATIOFORQUITTINGISTHEREFORE
WHICHIS4HISCOULDBE
DESCRIBEDASANRELATIVEINCREASEIN
YOURCHANCESOFBEINGAQUITTERWITHNURSE
INTERVENTION
4HEDIFFICULTYISTHATWHENWECOMPARE
THERISKOFCONTINUINGTOSMOKETHISIS
INTHENURSEGROUPANDINTHE
CONTROLGROUPGIVINGARATIOOFnA
RISKRATIOOF4HISWORKSOUTASA
RELATIVEREDUCTIONINYOURRISKOFCONTINUING
TOSMOKEWITHNURSEINTERVENTION4HE
RESULTSAPPEARTOBERATHERUNIMPRESSIVE
WHENPRESENTEDTHISWAY
)NCONTRASTTHEODDSFORTHOSEWHOQUIT
AREWITHNURSINGINTERVENTIONAND
FORTHECONTROLGROUPGIVINGANODDS
RATIOOFOR&ORTHOSE
WHOCONTINUETOSMOKEBOTHODDSCANBEINVERTEDANDSOTHEODDS
RATIOOFCONTINUINGTOSMOKEISTHEINVERSE
#HRIS#ATESCONTINUESHISSERIESUNRAVELLINGTHEMYSTERIES
OFSTATISTICS
$R#HRIS#ATES%"-WEBSITECANBE
FOUNDATWWWNNTONLINENET
1UITRESULTS.UMBEROFQUITTERS .UMBERSTILLSMOKING 4OTAL
*VU[YVSNYV\W
5\YZLPU[LY]LU[PVU
OFTHEODDSRATIOOFQUITTINGANDISOR
&ORTHERAREQUITTERSTHEODDSRATIOOF
ISSIMILARTOTHERISKRATIOOFBUT
FORTHOSEWHOCONTINUETOSMOKETHEODDS
RATIOSTILLLOOKSWORTHWHILEATWHILETHE
RISKRATIOAPPEARSMUCHLESSENCOURAGINGAT
7HENREADINGPAPERSTHATREPORTRISK
RATIOSORODDSRATIOSLOOKOUTFORTHEWAYS
THESEAREREPORTEDANDREMEMBERTHAT
WHENEVENTSARECOMMONLIKETHOSEWHO
CONTINUETOSMOKEINTHISSTUDYRISKSAND
ODDSBEHAVEVERYDIFFERENTLY
2%&%2%.#%/VSSPZ1-3PJO[LUZ[LPU,=VN[;4:[L]LUZ=1)PNSHU(5\YZLHZZPZ[LKJV\UZLSPUNMVYZTVRLYZPUWYPTHY`JHYL(UUHSZVM0U[LYUHS4LKPJPUL"!