Figure 3.

Time trends in percent of patients with high HbA1c values in the Louis Stokes Cleveland Department of Veterans Affairs Medical Center by insulin status. For each patient, HbA1c values within the calendar year were averaged to yield a mean annual HbA1c value (a single value per patient). Insulin status was determined for each patient by year in which an insulin prescription was first dispensed from a VISN 10 pharmacy. Once started, the patient was assumed to remain on insulin for subsequent years.