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HED 343 comparing OR & RR - Ratio Measures of...

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Ratio Measures of Association Relative Risk (RR): A ratio obtained by dividing the incidence rate of diseased in the exposed group by the incidence rate of diseased in the non-exposed group Calculating RR is appropriate only for cohort or intervention studies RR = Incidence of disease “X” in individuals exposed to risk factor “Y” Incidence of disease “X” in individuals not exposed to risk factor “Y” a b c d Disease Status Yes No Yes No Exposure Status b+d a+c a+b c+d
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Ratio Measures of Association RR = Incidence of disease “X” in individuals exposed to risk factor “Y” Incidence of disease “X” in individuals not exposed to risk factor “Y” RR = a / (a+b) c / (c+d) a b c d Disease Status D D 2 E E 2 Exposure Status b+d a+c a+b c+d
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Ratio Measures of Association Example 1: Association between use of artificial sweeteners & bladder cancer RR = 130 / 4130 = 1.02 222 / 7222 130 4000 222 7000 Bladder Cancer Yes No Yes No Artificial Sweeteners 4130 7222
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Ratio Measures of Association
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