Right, but the point that parent was making is that rather than just not implicating tea/coffee in causing these, the study shows that it reduces the chance of

Right, but the point that parent was making is that rather than just not implicating tea/coffee in causing these, the study shows that it reduces the chance of these. That it's a relative risk reduction is not particularly relevant to that. That said, I do agree that changes in relative risk are confusing and/or misleading to many people. A more interesting way of presenting this data, IMO, is the "number needed to treat", that is in order to reduce 1 stroke from occurring, ie, roughly 120 people need to drink 2 cups of coffee/tea per day to reduce 1 stroke, based on the numbers given here. This is obviously a lot more than the naive "30% means roughly 1 in 3 would see improvement" interpretation that the headline number pushes you towards.