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

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2
Q

relative risk?

A

relative risk = risk in exposed group / risk in non-exposed group

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3
Q

attributable risk?

A

attributable risk = risk in exposed group - risk in non exposed group

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4
Q

attributable risk percent?

A

attributable risk percent = attributable risk / incidence of disease in exposed group

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5
Q

number needed to harm (NNH)?

A

NNH = 1 / attributable risk

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6
Q

number needed to treat (NNT)?

A

1/ attributable risk reduction

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7
Q

Odds?

A

odds = number of exposed people with the disease / number of exposed people without the disease

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8
Q

odds ratio?

A

odds ratio = odds in exposed group / odds in non - exposed group

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9
Q
A
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