A hypothetical cohort study tested the association between intimate partner viol

Question

A hypothetical cohort study tested the association between intimate partner violence (IPV) and the occurrence of mood disorders in middle-aged women. Women who had been victims of IPV were 3.2 times more likely to be diagnosed with mood disorders than women who had not experienced IPV. After adjusting for several possible confounders, the odds ratio was adjusted to 2.5. Using an additive scale, how much of the excess risk was explained by the confounding variables?

31.8%

21.9%

28.0%

78.1%

31.8%

21.9%

28.0%

78.1%

Explanation / Answer

Women who had been victims of IPV were 3.2 times more likely to be diagnosed with mood disorders than women who had not experienced IPV.

After adjusting for several possible confounders, the odds ratio was adjusted to 2.5

So, a drop of 3.2 from 2.5 , =(3.2-2.5)/3.2 = 21.875% or 21.9%

Answer is B. 21.9%

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