a For a relative risk of 018 what is the percent increasedec

(a) For a relative risk of 0.18, what is the percent increase/decrease in risk? (b) For a relative risk of 2.27, what is the percent increase/decrease in risk? (c) For a percent decrease in risk of 8%, what is the relative risk?

Solution

a)

%change in risk = RR - 1 = 0.18 - 1 = -0.82

%change in risk = -82% [ANSWER, decrease by 82%]

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b)

%change in risk = RR - 1 = 2.27 - 1 = 1.27

%change in risk = 127% [ANSWER, increase by 127%]

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c)

RR = 1 + %change in rink = 1 + (-0.08) = 0.92 [ANSWER]