Figure 1.

Date of previous setting (vertical axis) of marker questions used in various diets (horizontal axis). The horizontal axis shows a particular diet of the exam, and the vertical axis the previous diets from which marker items were taken. Size of points is proportional to the number of questions.

McManus et al. BMC Medicine 2005 3:13   doi:10.1186/1741-7015-3-13
Download authors' original image