STATS

Question 1

Abbreviations

Answer 1

CER=control event rate, say 40%
EER= experimental event rate, 60%
ARR= absolute risk reduction= 60-40=20%

Question 2

relative risk

Answer 2

EER/CER= 60/40 = 0.67

Question 3

ARR

Answer 3

ARR= EER-CER= 60-40=20%

Question 4

NNT

Answer 4

NNT= 1/ARR= 1/20/100= 5

Question 5

Odds ratio

Answer 5

Odds ratio=
( EER/(1-EER) over CER/1-CER
60/40 over 40/60= 0.44

chaneg 1 to 100 if you want to use percents, keep it as a 1 if you’re using decimals

Question 6

relative risk reduction RRR

Answer 6

RRR= 1- RR

Question 7

NNH

Answer 7

NNH= 1/ARI
ARI= EER-CER 9same as ARR, depends how u look at it