Peter Attia· MD
the drug reduces the events from five out of a thousand to four out of a thousand so what's the relative risk reduction there the relative risk reduction is 20 right that's the four minus five divided by five in this case is a twenty percent relative risk reduction so you might say this is something we should be putting in the drinking water this is such an important thing right but you want to calculate how many people do you need to treat to prevent the event and to do that you have to take one and divide it by the absolute risk reduction not the relative risk reduction and the absolute risk reduction here is 0.01 percent and one divided by 0.01 percent is one thousand