The results of health risk assessments (HRA) are often returned to patients using some form of summary score. The goal of this image was to make an abstract (and arbitrary) HRA score have more intuitive meaning.
This number line graphic is supplemented with a continuous color gradient to reinforce the good vs. bad character of different score levels.
Note that two key reference standards (average score and score if this person quit smoking) are provided to improve evaluation of the number.
One weakness of the design is that the only thing linking the numbers (provided on top) and the number line below is the color of the border / text / line, a fairly subtle cue.