Risk & Odds Flashcards
1
Q
what is risk?
A
probability
2
Q
how would you calculate absolute risk?
A
no. expected outcomes / total outcomes
3
Q
what is the absolute risk difference?
A
difference between 2 risks
4
Q
how would you calculate the absolute risk difference?
A
risk - risk
5
Q
what is the NNT/H?
A
number of patients needed for 1 patient to be treated/harmed
6
Q
how would you calculate the NNT/H?
A
1/ARD
- round up
7
Q
what is the relative risk/risk ratio?
A
ratio between the 2 risks
8
Q
how would you calculate the relative risk/risk ratio?
A
risk/risk
9
Q
how would you calculate the odds ratio?
A
P/(1-P)
P=probability of event
10
Q
why would you use odds ratio instead of risk ratio?
A
- odds shows symmetry (risk does not always)
- odds are more numerically logical
