Several risk indexes describe outcomes in relation to exposures for a two-group situation with dichotomous outcomes. These indexes provide useful information for making clinical decisions. What index expresses the estimated proportion of people who would be spared from an adverse outcome through exposure to an intervention?

Question

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Absolute risk reduction (ARR) expresses the estimated proportion of people who would be spared from an adverse outcome through exposure to an intervention by comparing the event rates between two groups.

Several Risk Indexes Describe Outcomes in Relation to Exposures for a Two-Group