
Risk benefit ratio, also referred to as risk–benefit analysis, is the comparison of the risk of a situation to its related benefits. Exposure to personal risk is recognized as a normal aspect of everyday life. We accept a certain level of risk in our lives as necessary to achieve certain benefits. With most of these risks we feel we have some so...
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http://en.wikipedia.org/wiki/Risk_benefit_ratio

(from the article `therapeutics`) ...to select a drug that will destroy the most cancer cells, leave normal cells unharmed, and cause the fewest unpleasant and undesirable side ...
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http://www.britannica.com/eb/a-z/r/53

a measurement used to evaluate whether potential benefits outweigh potential risks (e.g., in a clinical trial).
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http://www.encyclo.co.uk/local/22225
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