title: report changes in a dataset quantitatively
body: <p>I have calculated cross sectional area of a vein. The purpose was to show the vein's diameter doesn't change too much in 1 cardiac cycle. But how can i show it quantitatively?
  Thank you
  Masoud<a href="https://i.stack.imgur.com/y0aQB.png" rel="nofollow noreferrer">cross sectional area over one cardiac cycle</a></p>