Risk = number of events of interest / total number of observations (x100 for %)
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What is used to compare risk in groups?
Relative risk
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What is the equation for relative risk or risk ratio?
Risk ratio = risk of an event on treatment / risk of an event on control
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What does a risk ratio of 1 mean?
There is no difference in effect
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What does a risk ratio of 0.92 mean?
The risk of still having the event on treatment was 92% of the risk on control OR the treatment reduced the risk of the event by 8%
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What is the equation for absolute risk reduction?
(Risk on treatment - risk on control) x 100. (Less accurate than relative risk ratio)
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What does a risk reduction of 0 imply?
There is no difference in effect
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What does an absolute risk reduction of -7% imply?
Treatment reduced the risk of the event by 7%
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What is Number Needed to Treat (NNT)?
An estimate of the number of people needed to treat to benefit one person, e.g. an NNT of 111 means 111 people could be treated with a drug for only one person to feel beneficial effects
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How to calculate NNT?
NNT = 1/ absolute risk reduction (round to the nearest 1)
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Other cards in this set
Card 2
Front
What is used to compare risk in groups?
Back
Relative risk
Card 3
Front
What is the equation for relative risk or risk ratio?
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