STATS Flashcards
1
Q
Abbreviations
A
CER=control event rate, say 40%
EER= experimental event rate, 60%
ARR= absolute risk reduction= 60-40=20%
2
Q
relative risk
A
EER/CER= 60/40 = 0.67
3
Q
ARR
A
ARR= EER-CER= 60-40=20%
4
Q
NNT
A
NNT= 1/ARR= 1/20/100= 5
5
Q
Odds ratio
A
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
6
Q
relative risk reduction RRR
A
RRR= 1- RR
7
Q
NNH
A
NNH= 1/ARI ARI= EER-CER 9same as ARR, depends how u look at it