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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