The benefit of treatments to prolong life can be described in two main ways: 1) how many months or years they add to an average patient’s life, or 2) how many patients benefit. Many times, a few people benefit a lot but most don’t benefit at all. This image tries to show how the average benefit relates to how many patients benefit.
This graphic uses a horizontal bar graphic to show magnitude of benefit and pie charts to show the proportion of patients receiving that benefit. Note that the average benefit is more subtly shown using the thin blue line.