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Level 151

### MiC PPD SDL - Therapy (II)

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Mathematical estimates of risk derived from research to inform clinical decisions
Define evidence based medicine
Relative risk
A type of risk that compares risk between two groups
RR = T / C
The equation for calculating relative risk (RR)
No difference
If the relative risk is 1, what is the conclusion of the treatment?
Treatment reduces risk
If the relative risk is <1, what is the conclusion of the treatment?
Treatment increases risk
If the relative risk is >1, what is the conclusion of the treatment?
Absolute risk
The risk of an individual developing a disease over a time period
ARR = C - T
The equation for calculating absolute risk reduction (ARR)
RRR = 1 - RR
The equation for calculating relative rate reduction (RRR)
NNT = 1 / ARR
The equation for calculating the number needed to treat (NNT) - remember that NNT must be rounded to the nearest person