This image presents a risk estimate to a patient. Its primary goal is to help patients categorize their risk (i.e., to make sure that patients know when they are at “high” risk or not).
This graphic uses a triangle design to translate a simple number line into a 2-dimensional shape, thereby providing height and area cues in addition to horizontal position.
It also features a strong callout flag that presents the patient’s risk numerically right in the middle of the display and provides an instruction (“see doctor”) whenever the risk level is in the “moderate” or “high” categories.
This image resulted in significantly higher accuracy in our testing (compared to other designs) but was not as good at helping people classify risks. Given that the primary goal of many risk calculators is to ensure accurate risk classification, our recommendation would NOT be to use this design as is but instead to use a graphic like this image does
but to add a stronger visual flag denoting the patient’s risk in the middle of the graphic.