What is Relative risk (RR)?

Relative risk is a way to see how likely something is to happen compared to another group.

Imagine you and your friend both play soccer every day. But you always bring water with you, while your friend doesn’t. At the end of the week, you’re still energized and playing well, but your friend feels tired and out of breath. This shows that bringing water might help keep you from getting too tired.

Let’s think of it like comparing two groups:

• Group A (like you) has a certain chance of something happening, in this case, not getting tired.
• Group B (like your friend) has a different chance, here, they are more likely to get tired.

Relative risk tells us how much more or less likely one group is compared to the other. It’s like saying, "If you bring water, you're 2 times less likely to get tired than your friend."

So if your friend gets tired 3 out of 5 days, and you only get tired 1 out of 5 days, then your relative risk of getting tired is much lower, which means you’re doing better!