Relative Risk Flashcards

1
Q

Describe relative risk

A

The ratio of two risks (probability an individual will experience event/disease)

Can be measured as a rate (number of outcomes per person TIME) or a risk (outcomes) ratio

The relative risk gives the strength of associated - the higher the relative risk the higher the association.

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2
Q

What studies can relative risk be found it?

A

Longitudinal/Cohort and RCTs

This is because the population is split into an exposed and non exposed group.

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3
Q

Why can’t case control studies calculate relative risk?

A

No cases of incidence

They’re in an disease and non disease groups hence the odds ratio can be found

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4
Q

Equation for relative risk

A

Relative risk = Risk in exposed group/Risk in unexposed group

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5
Q

If relative was 0.75 (e.g. use example of statin and risk of stroke) describe it

A

Point estimate for risk ratio is 0.75

This means that risk of stroke in statin group is 0.75 times that in placebo group

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6
Q

Equation for absolute excess risk

A

Absolute excess risk = risk in exposed person - risk in unexposed person

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