Theme 1, 2 and 3 formulae Flashcards
1
Q
how do you work out risk?
A
risk = number of exposed people with the disease / total number of exposed sample
2
Q
relative risk?
A
relative risk = risk in exposed group / risk in non-exposed group
3
Q
attributable risk?
A
attributable risk = risk in exposed group - risk in non exposed group
4
Q
attributable risk percent?
A
attributable risk percent = attributable risk / incidence of disease in exposed group
5
Q
number needed to harm (NNH)?
A
NNH = 1 / attributable risk
6
Q
number needed to treat (NNT)?
A
1/ attributable risk reduction
7
Q
Odds?
A
odds = number of exposed people with the disease / number of exposed people without the disease
8
Q
odds ratio?
A
odds ratio = odds in exposed group / odds in non - exposed group
9
Q
A