1.Here is an example as to how total cholesterol levels can be plotted by the self-report racial categories of White and Black, and by self-report racial categories and extent of European admixture.

2.As stated in the note on the slide, the filled rectangles depict the interquartile range and the lower and upper limits (filled diamonds) depict the 5th and 95th percentiles.

3.The percentiles to depict is arbitrary. For example, one could depict the interquartile range and 10th and 95th percentiles.