In a cohort study on HRT and breast cancer, the incidence of breast cancer among those who used HRT is 20 per 1,000, and the incidence among those who did not use HRT is 1 per 1,000. The proportion of breast cancer among those who used HRT that is attributable to HRT is ____% a) 85 b) 90 c) 100 d) 95

In a cohort study on HRT and breast cancer, the incidence of breast cancer among those who used HRT is 20 per 1,000, and the incidence among those who did not use HRT is 1 per 1,000. The proportion of breast cancer among those who used HRT that is attributable to HRT is ____% a) 85 b) 90 c) 100 d) 95

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