This Figure is a Forrest plot of the time in therapeutic range (TTR) in a large sample of studies of patients between treated with warfarin in either anticoagulation (AC) clinics or in community-based units with dosing algorithms.  Overall these patients were maintained within the TTR only about 55% of the time.[76]  Although this was rather better in AC clinics (63% TTR), it was even lower in community-based algorithm treatment, at about 51% TTR.

Rothman SA. Am J Med 2013; 126: 00-00.