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780 Men Suffering from High Blood Pressure Were Randomly Assigned

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780 men suffering from high blood pressure were randomly assigned to one of two groups.Over a four-month period,the first group received an experimental drug and the second group received a placebo.A larger decrease in diastolic blood pressure was observed for those who received the drug.The patients did not know whether they were receiving the drug or the placebo.Neither the technicians administering the treatments nor the physicians evaluating the results knew which participants had received the drug and which the placebo.

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