WASHINGTON — By now we've all heard that the Pfizer COVID-19 vaccine has an efficacy rate of 95%, Moderna of 94%, and Johnson & Johnson about 66%; what you may not have known is that rate's technical ...
DEAR DR. ROACH: Could you please explain the percentages that are given when a study indicates an increase for a particular risk? For example, say a person with mild coronary artery disease is at an ...
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