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Two hospitals report outcomes for a particular surgery. Hospital A has a 90% success rate overall; Hospital B has an 85% success rate overall. However, when stratified by patient risk level: Low-risk patients—Hospital A = 95%, Hospital B = 98%; High-risk patients—Hospital A = 80%, Hospital B = 79%. Hospital B has a lower overall rate but higher success within EACH risk category. Which explains this paradox?
Two hospitals report outcomes for a particular surgery. Hospital A has a 90% success rate overall; Hospital B has an 85% success rate overall. However, when stratified by patient risk level: Low-risk patients—Hospital A = 95%, Hospital B = 98%; High-risk patients—Hospital A = 80%, Hospital B = 79%. Hospital B has a lower overall rate but higher success within EACH risk category. Which explains this paradox?