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COMLEX LEVEL 1 BIOSTATS (FIRST AID) EXAM QUESTIONS AND ANSWERS

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COMLEX LEVEL 1 BIOSTATS (FIRST AID) EXAM QUESTIONS AND ANSWERS

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COMLEX LEVEL 1 BIOSTATS (FIRST
AID) EXAM QUESTIONS AND
ANSWERS
odds2vratio2v-2vANS--OR2v=2vad/bc2v

Typically2vused2vin2vcase-control2vstudies

Relative2vRisk2v-2vANS--RR2v=2v[a/(a2v+2vb)]2v/2v[c/(c2v+2vd)]

Typically2vused2vin2vcohort2vstudies

Relative2vRisk2vReduction2v-2vANS--RRR2v=2v12v−2vRR

Risk2vof2vexposed2vgroup2vover2vrisk2vof2vthe2vcontrol2vgroup

Attributable2vRisk2v-2vANS--AR2v=2v[a/a2v+2vb]2v−2v[c/c2v+2vd]

The2vdifference2vin2vrisk2vbetween2vthe2vexposed2vand2vcontrol2vgroups

Absolute2vRisk2vReduction2v-2vANS--ARR2v=2v[c/c2v+2vd]2v−2v[a/a2v+2vb]

The2vdifference2vin2vrisk2vattributable2vto2vthe2vintervention2vas2vcompared2vto2vthe2vcont
rol

Number2vNeeded2vto2vtreat2v-2vANS--NNT2v=2v1/ARR

Number2vof2vpatients2vwho2vneed2vto2vbe2vexposed2vfor2vone2vpatient2vto2vbenefit

Number2vNeeded2vto2vHarm2v-2vANS--NNH2v=2v1/AR

Number2vof2vpatient2vwho2vneed2vto2vbe2vexposed2vto2va2vrisk2vfactor2vfor2vone2vto2vbe2v
harmed

Case2vFatality2vRate2v-2vANS--CFR%2v=2v(deaths/cases)2vx2v100

Percentage2vof2vdeaths2voccurring2vamong2vthose2vwith2vdisease

Mortality2vRate2v-2vANS--
Number2vof2vdeaths2vwithin2va2vpopulation2vover2va2vperiod2vof2vtime.2vUsually2vgiven2vi
n2vdeaths2vper2v1,0002vper2vyear.

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