Absolute vs. relative risk
When most people hear a percentage given in a study they think of absolute risk. Say that there’s a disease that affects 10 out of 100 people. Absolute risk applies to the whole group. If something increases the absolute risk by 50%, then that disease would affect 60 out of 100 people.
However, relative risk only applies to smaller portion of people who develop that disease. A relative risk increase of 50% would then mean that 15 out of 100 people get this disease.