This Figure presents essentially the same information as in the previous Figure, but in graphic form.  The data in the left-hand side of the Figure are from a single, representative study. [81] On the right are the average TTR values for 5 representative studies.[82][83][84][85][86] Both graphic summaries basically show the same thing: that only about half of the time do patients with nonvalvular AFib who are treated and adherent to warfarin have serum values within the therapeutic range – ie, TTRs average about 50%.

Reiffel JA. Am J Med 2013; 126: 00-00.