Epidemiology Flashcards
(4 cards)
1
Q
What is absolute risk and relative risk
A
The proportion who are / will be affected and relative risk is the ratio of that proportion in 1 population to the same proportion in another
2
Q
What is number needed to treat (NNT)
A
The number of patients who must be treated in order to prevent one adverse effect
3
Q
What is number needed to harm (NNH)
A
Number needed to harm if treatment is harmful
4
Q
How do you work out NNT / NNH
A
NNT/NNH = 1 / absolute value of risk difference expressed as a proportion
